Chain Do I have to replace the sprockets at the same time I replace the chain?

There are a lot of steps, and you need to take your time. You will need access to a lift or jack stand, and make sure you keep the work area clean and organised, taking photos of the timing system will make your life easier when it comes to re-timing the engine.

Water Pump Replacement (2.4L)
Removal Procedure

1. Drain the coolant. Recover the coolant. Refer to Cooling System Draining and Filling.
2. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement in Engine Exhaust.
3. Remove the coolant intake pipe. Refer to Engine Coolant Inlet Pipe Replacement in Engine Cooling.
4. Lower the vehicle.
5. Disconnect the heater hose quick connect from the heater outlet pipe.
6. Remove the timing chain and tensioner. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement in Engine Mechanical - 2.4L. (see below procedure)
7. Remove the water pump cover-to-cylinder block bolts.
8. Remove water pump pipe to cylinder block bolt.
9. Remove the 3?water pump-to-timing chain housing nuts.
10. Remove the water pump and cover assembly.
11. Remove the water pump cover-to-coolant pump assembly bolts.
12. Clean all sealing surfaces.

Installation Procedure

Important: Before you install the coolant pump, read the entire procedure. Follow the tightening sequences in order to avoid part damage and to provide proper sealing.


1. Install the pump cover bolts. Hand tighten the bolts.
2. Install water pump cover assembly.
3. Install the cover-to-block bolts. Hand tighten the bolts.
4. Install the coolant pump-to-timing chain housing nuts. Hand tighten the nuts.
Notice: Refer to Fastener Notice in Cautions and Notices.

5. Torque in sequence as follows:
   1. Tighten the water pump-to-timing chain housing nuts.
      Tighten
      Tighten water pump to timing chain housing nuts to 26?Y (19?lb?ft).
   2. Tighten the pump cover-to-pump assembly bolts.
      Tighten
      Tighten the water pump cove to water pump bolts to 14?Y (124?lb?in).
   3. Tighten the coolant pump cover-to-engine block bolts. Tighten the bottom bolt first.
      Tighten
      Tighten water pump to engine block bolts to 26?Y (19?lb?ft).
6. Install heater hose to pipe on water pump.
7. Install the exhaust manifold and install new gaskets. Refer to Exhaust Manifold Replacement in Engine Exhaust.
8. Install oil level indicator tube and indicator. Refer to Oil Level Indicator Tube Replacement in Engine Mechanical-2.4L.
9. Connect the brake vacuum pipe to the cam housing.
10. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
11. Install catalytic converter to to manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
12. Install the coolant inlet pipe. Refer to Engine Coolant Inlet Pipe Replacement.
13. Install the timing chain and tensioner. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement in Engine Mechanical - 2.4L.
14. Lower the vehicle.
15. Connect the oxygen sensor connector.
16. Fill cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
17. Inspect the system for leaks.

Camshaft Timing Chain, Sprocket, and Tensioner Replacement
Removal Procedure

Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
Notice: The timing chain on the LD9 (VIN T) Twin Cam Engine is not to be replaced with the timing chain from any other model year. The timing sprockets are different on the Twin Cam engine and the shape of the links matches the sprockets. Engine damage may result if the wrong timing chain is used. The timing chain and the crankshaft sprocket must be marked so that they are reinstalled in the same side facing out at the time of reassembly.

1. Disconnect the negative battery cable.
2. Remove the engine front cover. Refer to Engine Front Cover Replacement.
3. Rotate the crankshaft clockwise (as viewed from the front of the engine, normal rotation) until the camshaft sprocket timing dowel pin holes align with the holes in the timing chain housing.
4. Set the crankshaft sprocket keyway pointing upwards. Align with the centerline of the cylinder bores. This is the timed position.
5. Remove the timing chain guides.
6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
7. Ensure that all of the slack in the timing chain is above the tensioner assembly.
8. Remove the timing chain tensioner bolts and the tensioner.
9. Remove the tensioner shoe. Use a small locking ring plier in order to engage the hole in the locking tab and remove the shoe from the stud.
Notice: Do not attempt to pry the sprocket off the camshaft or damage to the sprocket or chain housing could occur.
Important: Mark the timing chain and the crankshaft sprocket prior to removal. If the chain or the crankshaft sprocket is installed with the wear pattern in the opposite direction, noise and increased wear may occur.

10. Mark the crankshaft sprocket and the timing chain outer surface.
11. Remove the timing chain.
12. Lower the vehicle.
13. Holding the intake camshaft sprocket with J 39579, remove the sprocket bolt and washer.
14. Remove the washer from the bolt and rethread the bolt back into the camshaft.
15. Using a 3-jaw puller and the relief holes in the sprocket, remove the intake camshaft sprocket.
16. Repeat this procedure for the exhaust camshaft sprocket.
17. Clean the old sealant from the bolt with a wire brush.
18. Clean the threaded hole in the camshaft with a round nylon bristle brush.
19. Inspect the parts for wear. Replace the parts as necessary.Some scoring of the timing chain shoe and the guides is normal.
20. Replace the timing chain shoe or guides if the scoring exceeds 1.12?mm (45?in).

Installation Procedure

1. Use Adhesive/Sealant Compound GM?P/N?12345493 or equivalent on the camshaft sprocket bolt. Install the intake and exhaust camshaft sprockets onto the camshafts with the marked surface showing.Notice: Refer to Fastener Notice in Cautions and Notices.
   
2. Install the retaining bolts and washers to the intake and exhaust camshaft sprockets.
3. Tighten
   Tighten the bolts to 70?Y (52?lb?ft) while holding the sprockets with the J 39579.
4. Install the J 36800 through the holes in the camshaft sprockets into the holes in the timing chain housing. This will position the camshaft for correct timing.
5. If the camshafts are out of position (you must rotate the camshaft more than 1/8?turn in order to install the alignment dowel pins), use the following procedure:
   1. Rotate the crankshaft 90?degrees clockwise off of the TDC in order to give the valves adequate clearance to open.
   2. Once the camshafts are in position and the dowels installed, rotate the crankshaft counter clockwise back to the top dead center.

Notice: Do not rotate the crankshaft clockwise to TDC. Valve or piston damage could occur.
Important: The side of the timing chain that was marked during removal must be showing when the chain is installed.

6. Install the timing chain over the exhaust camshaft sprocket, around the coolant pump, and around the crankshaft sprocket.
   1. Remove the alignment dowel pin from the intake camshaft.
   2. Using the J 39579, rotate the intake camshaft sprocket counterclockwise enough in order to slide the timing chain over the intake camshaft sprocket.
   3. Release the J 39579. The length of the chain between the 2?camshaft sprockets will tighten.
   4. If properly timed the intake camshaft alignment dowel pin should slide in easily. If the dowel pin does not fully index, the camshafts are not timed correctly and the procedure must be repeated.
7. Leave the alignment dowel pins installed.
8. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
9. The timing marks on the crankshaft and on the cylinder block should be aligned when the slack is removed from the chain linking the intake camshaft sprocket and the crankshaft sprocket. If the marks are not aligned, move the chain one tooth forward or rearward, remove the slack and re-examine the marks.

Important: Use the following steps in order to reset the timing chain tensioner assembly to the zero position.

10. Reset the timing chain tensioner assembly.
    1. Insert the tensioner plunger assembly into the tensioner housing.
    2. With the tensioner plunger fully extended, turn the complete assembly upside down on a bench or other flat surface.
    3. With the plunger face against the workbench, press firmly on the bottom of the tensioner housing.
    4. Compress the plunger until the plunger is seated flush in the tensioner.


11. Check the plunger to make sure the plunger is out of the cylinder at the correct dimension. The correct dimension for the plunger to extend out of the cylinder is 1.7?mm (0.07?in) maximum.


12. Loosely install the tensioner assembly and bolts to the timing chain housing.
13. Install the timing chain tensioner shoe on the stud.
14. Apply hand pressure to the timing chain tensioner shoe until the locking tab seats in the groove in the stud.
15. Tighten the timing chain tensioner bolts. Do Not overtighten.
    Tighten
    Tighten the bolts to 10?Y (89?lb?in).


Important: If the timing chain tensioner is not released from the installation position, engine damage will occur when the engine is started.

16. Release the timing chain tensioner plunger.
    1. Using a flat blade screwdriver, cotter pin remover, or similar tool, press firmly against the face of the timing chain tensioner plunger.
    Important: If the timing chain tensioner cannot be depressed, the plunger is not properly reset and the procedure for resetting the timing chain tensioner should be repeated.
    
    2. Depress the timing chain tensioner plunger until the plunger is bottomed out in the bore of the timing chain tensioner.
    3. Release the tensioner plunger. the plunger should press firmly against the back of the timing chain tensioner shoe.
17. Remove J 36800 from the camshaft sprockets.
18. Rotate the crankshaft clockwise 2?full rotations. Align the crankshaft keyway with the mark on the cylinder block, and reinstall the alignment dowel pins. The pins should slide in easily if the engine is timed correctly.


19. Install the timing chain guides.
20. Install the engine front cover. Refer to Engine Front Cover Replacement.
21. Connect the negative battery cable.
    Tighten
    Tighten the bolt to 16?Y (12?lb?ft).

2001 , no such ani-mule !
"Introduced for the 2002 model year as a replacement for the Cherokee (XJ),"
you meant manufactures date not model and reg. date. sure.
2002 !
3.7L V6 (cop spark ) chain drive cams....
timing ( cam or spark?)
"Ignition timing is controlled by the Powertrain Control Module (PCM). No adjustment is possible"
so Cam timing (alldata.com covers this in detail)
why not post the context, Im doing what.?
im doing a 60k belt swap
or it slipped. or think id did.
or just put in a new head or cam? see , context is 100% important.
im here, going to there.....
im on line, and it shows 4 engines, i think that is wrong, but...

you must be asking chain cam sprocket timing.
im at alldata.com (or FSM)
there are 37 install steps, im not sure what step you want me
to pluck out. but here is my guess. step 8 ,9,10

1. Install both secondary chains onto the idler sprocket. Align two plated links on the secondary chains to be visible through the two lower openings on the idler sprocket (4 o'clock and 8 o'clock). Once the secondary timing chains are installed, position special tool 8429 to hold chains in place for installation.
2. Align primary chain double plated links with the timing mark at 12 o'clock on the idler sprocket.
3. Align the primary chain single plated link with the timing mark at 6 o'clock on the crankshaft sprocket.

step 12:
Install all chains, crankshaft sprocket, and idler sprocket as an assembly . After guiding both secondary chains through the block and cylinder head openings, affix chains with a elastic strap or equivalent. This will maintain tension on chains to aid in installation. Align the timing mark on the idler sprocket gear to the timing mark on the counterbalance shaft drive gear, then seat idler sprocket fully . Before installing idler sprocket bolt, lubricate washer with oil, and tighten idler sprocket assembly retaining bolt to 25 ft. lbs. (34 Nm).

step 13:

1. Align left camshaft sprocket "L" dot to plated link on chain.
2. Align right camshaft sprocket "R" dot to plated link on chain.

step 15/16

1. Remove Special Tool 8429, then attach both sprockets to camshafts. Remove excess oil from bolts, then Install sprocket bolts, but do not tighten at this time.
2. Verify that all plated links are aligned with the marks on all sprockets and the "V6" marks on camshaft sprockets are at the 12 o'clock position.

do ask questions, or login to alldata.com or mitchels
or get a real FSM.
its nothing trivial.

in fact get the book before the job. so are perpared.

Did you take pictures while removing the originals? It's always a good habit. Below are the instructions you need to follow. Your own pics are very helpful when doing a big job like this.

1. Disconnect negative battery (1) cable.
2. Drain cooling system.
3. Remove upper intake manifold.
4. Remove cylinder head covers, crankshaft vibration damper, and timing chain cover.

CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.

1. Align crankshaft sprocket timing mark to mark on oil pump housing (2). The mark on oil pump housing is 600 ATDC of #1 cylinder.

CAUTION: When the timing chain is removed and the cylinder heads are still installed, DO NOT rotate the camshafts or crankshaft without first locating the proper crankshaft position. Failure to do so will result in valve and/or piston damage.

1. Remove primary timing chain tensioner retainer cap (2) and tensioner (1) from right cylinder head.

1. Disconnect and remove camshaft position sensor (4) from left cylinder head.
2. Remove timing chain guide access plugs (3) from cylinder heads.

NOTE: When camshaft sprocket bolts are removed, the camshafts will rotate in a clockwise direction.

1. Starting with the right camshaft sprocket, remove the sprocket attaching bolts. Remove camshaft damper (1) (if equipped) and sprocket.
2. Remove left side camshaft sprocket attaching bolts and remove sprocket.
3. Remove lower chain guide (7) and tensioner arm (8).
4. Remove the primary timing chain (5).
5. Remove crankshaft sprocket (6).

INSTALLATION

1. Inspect all sprockets (4,9,11) and chain guides (2,5,10). Replace if worn.
2. For crankshaft sprocket installation procedures Refer to CRANKSHAFT SPROCKET.
3. If removed, install right and left side short chain guides (11). Tighten attaching bolts to 28 Nm (250 inch lbs.) .
4. Align crankshaft sprocket timing mark to the mark on oil pump housing (3).

NOTE: Lubricate timing chain and guides with engine oil before installation.

1. Place left side primary chain sprocket onto the chain so that the timing mark is located in-between the two (plated) timing links (1).

1. Lower the primary chain with left side sprocket through the left cylinder head opening.

NOTE: The camshaft sprockets can be allowed to float on the camshaft hub during installation.

1. Loosely position left side camshaft sprocket over camshaft hub.
2. Align timing (plated) link to the crankshaft sprocket timing mark (3).
3. Position primary chain onto water pump drive sprocket (10).
4. Align right camshaft sprocket timing mark to the timing (plated) link on the timing chain (8) and loosely position over camshaft hub.
5. Verify that all chain timing (plated) links are properly aligned to the timing marks on all sprockets.
6. Install left side lower chain guide (2) and tensioner arm (5). Tighten attaching bolts to 28 Nm (250 inch lbs.) .

NOTE: Inspect O-ring on chain guide access plugs before installing. Replace O-ring as necessary.

1. Install chain guide access plugs to cylinder heads. Tighten plugs to 20 Nm (15 ft. lbs.) .

NOTE: To reset the primary timing chain tensioner, engine oil will first need to be purged from the tensioner.

1. Purge oil from timing chain tensioner using the following procedure:

1. Place the check ball (2) end of tensioner into the shallow end of Special Tool 8186 (3).
2. Using hand pressure, slowly depress tensioner until oil is purged from tensioner.

1. Reset timing chain tensioner using the following procedure:

1. Position cylinder plunger (4) into the deeper end of Special Tool 8186 (3).
2. Apply a downward force until tensioner is reset.

NOTE: If oil was not first purged from the tensioner, use slight finger pressure to assist the center arm pin of Special Tool 8186 to unseat the tensioner's check ball.

CAUTION: Ensure the tensioner is properly reset. The tensioner body (4) must bottom against the top edge of Special Tool 8186 (3). Failure to properly perform the resetting procedure may cause tensioner jamming.

NOTE: Inspect the tensioner O-ring (2) for nicks or cuts and make sure the snap ring (1) is correctly installed, replace as necessary.

1. Install the reset chain tensioner (1) into the right cylinder head.
2. Position tensioner retaining plate (2) and tighten bolts (1) to 12 Nm (105 inch lbs.) .

1. Starting at the right cylinder bank, first position the camshaft damper (1) (if equipped) on camshaft hub, then insert a 3/8 square drive extension with a breaker bar into intake camshaft drive hub. Rotate camshaft until the camshaft hub aligns to the camshaft sprocket and damper attaching holes. Install the sprocket attaching bolts and tighten to 28 Nm (250 inch lbs.) .
2. Turn the left side camshaft by inserting a 3/8 square drive extension with a breaker bar into intake camshaft drive hub and rotate camshaft until the sprocket attaching bolts can be installed. Tighten sprocket bolts to 28 Nm (250 inch lbs.).
3. Rotate engine slightly clockwise to remove timing chain slack, if necessary.

1. Activate the timing chain tensioner by using a flat bladed pry tool to gently pry tensioner arm towards the tensioner slightly. Then release the tensioner arm. Verify the tensioner is activated (extends).

1. Install camshaft position sensor (2) and connect electrical connector.
2. Install the timing chain cover, crankshaft vibration damper, and cylinder head covers.
3. Install upper intake manifold.

NOTE: After installation of a reset tensioner, engine noise will occur after initial start-up. This noise will normally disappear within 5-10 seconds.

1. Fill cooling system.

May be its problem with timing chain and it has to be inspected and replaced.Or its possible that timing chain is got misaligned.

There are few help,links provided related to timing chain assembly and dis-assembly. Go through it and confirm proper inspecting of timing chain.

Click the required help link below:----How to Replace Timing Chain Cover & Seal on Audi A4 ? http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-timing-chain-cover-seal.html
----------1982 Toyota Pickup: Set ignition timing, engine overheating, timing chain issue, dist off? http://whatisbyme.blogspot.in/2012/05/1982-toyota-pickup-set-ignition.html
----------How to Remove Timing Chain Cover and Seal on Toyota Previa?

http://technoanswers.blogspot.com/2011/12/how-to-remove-timing-chain-cover-and.html

--------

How to Remove Timing Chain and Gears on Toyota Previa?

http://technoanswers.blogspot.com/2011/12/how-to-remove-timing-chain-and-gears-on.html

-------

Ford Mondeo ST220 camshaft Timing specifications? http://technoanswers.blogspot.in/2012/02/ford-mondeo-st220-camshaft-timing.html
------------Replacing Timing Chain Cover For 2009 Ford?

http://repairhelpcenter.blogspot.in/2012/03/replacing-timing-chain-cover-ford-2009.html

-----------
Timing Chains & Front Cover Removal on 2008 Ford Taurus? http://repairhelpcenter.blogspot.in/2012/03/timing-chains-front-cover-removal-on.html
----------How to Replace Timing Chain Cover, Chain, Sprockets, & Seal On Ford Taurus? http://repairhelpcenter.blogspot.in/2012/03/how-to-replace-timing-chain-cover-chain.html
---------How to Replace Timing Chain & Sprockets on Ford Windstar? http://repairhelpcenter.blogspot.in/2012/03/how-to-replace-timing-chain-sprockets.html
---------Timing Chain & Sprockets Replacing on Ford, Mercury and Lincoln? http://fordrepairhelp.blogspot.in/2012/03/timing-chain-sprockets-replacing-on.html
----------How to Replace Timing Chain & Sprockets on Ford Edge and Lincoln MKX? http://howtobyme.blogspot.in/2012/03/how-to-replace-timing-chain-sprockets.html
------How To Replace Timing Chain, Sprockets & Front Cover on Ford Expedition and Lincoln Navigator? http://repairhelpcenter.blogspot.in/2012/03/how-to-replace-timing-chain-sprockets_356.html
---------Timing Chain, Sprockets, Front Cover & Seal removal for Ford Mustang? http://schematicsdiagram.blogspot.in/2012/03/timing-chain-sprockets-front-cover-seal.html
---------How to Replace Timing Chain on Buick LaCrosse? http://howtobyme.blogspot.in/2012/03/how-to-replace-timing-chain-on-buick.html
---------These details will help.For more help keep updated.Thanks.

Timing is not resettable by the user, as the computer controls this based on knock or no knock conditions which will advance or ****** ignition timing for optimum performance.

The valve timing is something that is set when installing the timing chain:

2.5L, 2.8L and 3.1L Engines Fig. 4: Timing chain and sprocket removal - 2.5L engine
Fig. 5: Timing chain and sprocket removal - 1996 3.1L engine shown
Fig. 6: You must use a suitable puller to remove the crankshaft sprocket

1. Disconnect the negative battery cable.
2. Remove the timing chain front cover assembly, as outlined earlier in this section.
3. Rotate the crankshaft until the timing marks on the crankshaft sprocket and camshaft sprocket locator hole are aligned to the marks on the engine block or timing chain dampener. This is the No. 1 piston at TDC (No. 4 firing position).
4. Unfasten the camshaft sprocket retaining bolt/screw, then remove the camshaft sprocket and the timing chain. NOTE: If the camshaft sprocket does not come off easily, a light blow on the lower edge of the sprocket with a rubber mallet should loosen the sprocket.
   
5. Remove the crankshaft sprocket using tool J 23444-A or equivalent puller.
6. If necessary, remove the timing chain dampener retaining bolts, then remove the dampener. To install:
   
7. Install the crankshaft sprocket using tool J 38612 until it the sprocket is fully seated on the flange of the crankshaft nose. Apply a coat of Molykote® or equivalent, to the sprocket thrust surface.
8. Hold the camshaft sprocket with the chain hanging down, and align the marks on the camshaft and crankshaft sprockets.
9. If removed, install the timing chain damper to the engine block.
10. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket. Install the camshaft sprocket and chain, use the camshaft sprocket bolts to draw the sprocket on to the camshaft. Tighten the sprocket bolts to 18 ft. lbs. (25 Nm).
11. Lubricate the timing chain with engine oil.
12. Install the front cover assembly, as outlined earlier in this section.
13. Connect the negative battery cable.

Timing Chain and Gears REMOVAL & INSTALLATION 1.9L Engine NOTE: The following procedure requires the use of the puller tool No. J-25031 or equivalent, and timing sprocket installation tool No. J-26587 or equivalent.

1. Remove the timing (front) cover from the engine.
2. Lock the shoe on the automatic adjuster in fully retracted position by depressing the adjuster lock lever. NOTE: To remove the timing chain, it may be necessary to remove the camshaft sprocket. Before removing the timing chain, be sure to align the timing marks.
   
3. Remove timing chain from crankshaft sprocket.
4. Check the timing sprockets for wear or damage. If crankshaft sprocket must be replaced, remove the sprocket and the pinion gear from crankshaft using the puller tool No. J-25031 or equivalent.
5. Check timing chain for wear or damage; replace as necessary. Measure distance "L'' (40 links) with the chain stretched with a pull of approximately 22 lbs. (98N). Standard "L'' value is 15 in. (381mm); replace chain if "L'' is greater than 15.16 in. (385mm).
6. Remove the automatic chain adjuster-to-engine bolt and the adjuster.
7. To check the operation of the automatic chain adjuster, push the shoe inwards, if it becomes locked, the adjuster is working properly. The adjuster assembly must be replaced if rack teeth are found to be worn excessively.
8. To remove the chain tensioner, remove the "E'' clip and the tensioner. Check the tensioner for wear or damage; if necessary, replace it. Fig. 1: Timing chain guide and tensioner - 1.9L engine
   
   
9. Inspect the tensioner pin for wear or damage. If replacement is necessary, remove the pin from the cylinder block using a pair of locking pliers. Lubricate the NEW pin tensioner with clean engine oil. Start the pin into block, then place the tensioner over the appropriate pin. Position the E-clip onto the pin, then (using a hammer) tap it into the block until clip just clears tensioner. Check the tensioner and adjuster for freedom of rotation on the pins.
10. Inspect the guide for wear or damage and plugged lower oil jet. If replacement or cleaning is necessary, remove the guide bolts, the guide and the oil jet. Install a new guide and upper attaching bolt. Install the lower oil jet and bolt, so that the oil port is pointed toward crankshaft. To install: Fig. 2: Timing chain alignment and installation - 1.9L engine
    Fig. 3: Inspecting the timing chain for wear
    
    
11. Install the timing sprocket and the pinion gear (groove-side toward the front cover). Align the key groove with crankshaft key, then drive it into position using installation tool No. J-26587 or equivalent.
12. Turn the crankshaft so that key is turned toward the cylinder head-side (No. 1 and No. 4 pistons at TDC).
13. Install the timing chain, align the timing chain mark plate with the mark on the crankshaft timing sprocket. The side of the chain with the mark plate is on the front-side and the side of chain with the most links between mark plates is on the chain guide-side. Keep the timing chain engaged with the camshaft timing sprocket until the camshaft timing sprocket is installed on the camshaft.
14. Install the camshaft timing sprocket so that it's marked-side faces forward and it's triangular mark aligns with the chain mark plate.
15. Install the automatic chain adjuster.
16. Release the lock by depressing the shoe on adjuster by hand, and check to make certain the chain is properly tensioned when the lock is released.
17. Install the timing cover assembly.

1998-2003 To Remove:

1. Remove or disconnect the following:
   • Crankshaft pulley and hub
   • Drive belt tensioner
     
     
   • Timing chain cover bolts
     
     
   • Timing chain cover and gasket
2. Install a bolt in the end of the crankshaft CAUTION
   Do not install the crankshaft balancer bolt or a bolt longer than 1 inch or damage to the crankshaft threaded hole will result.
   
3. Rotate crankshaft until the number 1 piston is at Top Dead Center of compression stroke.
4. Make sure that the alignment marks are aligned with the tabs on the timing chain tensioner.
   
   
5. Measure distance between hole in bracket and unworn surface of timing chain tensioner shoe. NOTE: If distance between the hole and unworn surface of timing chain tensioner is greater than 0.314 in (8 mm), replace tensioner, timing chain and sprockets.
   
6. Remove timing chain tensioner bolts.
7. Remove the timing chain, timing chain tensioner and camshaft sprocket at the same time.
8. Remove the crankshaft sprocket using special tool J 22888-20A or equivalent.
9. Remove crankshaft sprocket alignment key.

NOTE: If any camshaft components are being replaced to correct a noise problem, all camshaft drive components must be replaced.
To Install:

1. Install the crankshaft sprocket alignment key.
2. Install the crankshaft sprocket using special tool J 5590 or equivalent.
   
   
3. Compress the timing chain tensioner spring and insert a pin into the tensioner hole to retain the tensioner shoe.
4. Install timing chain and timing chain tensioner (do not tighten tension bolts).
5. Align the crankshaft and camshaft timing marks with the tab on the timing chain tensioner.
6. Tighten the timing chain tensioner bolts.
   • Torque to: 18 ft lbs (24 Nm)
7. Tighten the camshaft sprocket bolt.
   • Torque to: 96 ft lbs (130 Nm)
8. Remove pin from timing chain tensioner hole.
9. Remove bolt from end of crankshaft. CAUTION
   Inspect the timing chain cover for warping or damage. Replace if needed.
   
10. Clean all timing chain cover mating surfaces.
11. Install or connect the following:
    • Timing chain cover to the engine block
      1. Ensure that the gasket is installed properly in the groove in the timing chain cover
    • Timing chain cover and make sure it fully seated on the alignment dowel pins
    • Timing chain cover bolts
      1. Torque to: 97 inch lbs (11 Nm)
    • Drive belt tensioner
    • Crankshaft damper hub and the crankshaft pulley

During most engine rebuilds, a completely new timing assembly should be installed. If wear exists on any component, replacement of the entire assembly is necessary. Wear in the chain, gears, or sprockets means a timing lag, which results in poor engine performance.
The timing chain or belt is generally installed with the gears in their correct positions. Before installing a new chain, soak it in oil.
OHC (Overhead Cam) Engines
Some OHC engines use a chain drive; others use a belt drive. Removing the cover on some OHC engines that have timing chains is more difficult, because the cover often fits between the oil pan and the cylinder head. There are special procedures for replacing cam timing components in these engines.
Before a chain repair job, perform a leakage test on non-freewheeling engines to check for bent valves, so that an accurate repair estimate can be made.
OHV (Overhead Valve) Pushrod Engines
On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another. NOTE THIS IS FOR 2WD 4.0

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SPECIAL TOOLS REQUIRED (or equivalents)

• J-36008, Camshaft sprocket timing alignment pins.
• J-39579, Camshaft sprocket wrench.

CAUTIONS:

• The timing chain on the 1996 LD9 (VIN T) Twin Cam Engine is not to be replaced with the timing chain from any other model year. The timing sprockets are different on the Twin Cam Engine and the shape of the links matches the sprockets. Engine damage may result if the wrong timing chain is used.
• The timing chain and crankshaft sprocket MUST be marked so that they are reinstalled with the same side facing out at the time of reassembly.
• Failure to follow the removal and installation procedures could result in severe engine damage.

REMOVE OR DISCONNECT

1. Negative battery cable.
2. Front cover, refer to Timing Cover / Service and Repair .
3. Rotate crankshaft in clockwise direction until camshaft and crankshaft timing marks are aligned.
4. Timing chain guides.
5. Raise and support vehicle.
6. Ensure slack in timing chain is above tensioner assembly, then remove chain tensioner. The timing chain must be disengaged from grooves in tensioner shoe to permit removal of shoe. Position a suitable screwdriver under timing chain while pulling shoe outward. If difficulty is encountered in removing tensioner shoe, proceed as follows:

1. Lower vehicle, then while holding the intake camshaft sprocket with J-39579, remove sprocket bolt and washer.
2. Remove washer, then install bolt into camshaft by hand.
3. Position a suitable three jaw puller into intake camshaft sprocket relief holes and remove sprocket. CAUTION: Do NOT pry on camshaft sprocket as damage to sprocket or timing chain housing may result.

1. Tensioner assembly attaching bolts and tensioner assembly.
2. MARK CRANKSHAFT SPROCKET AND TIMING CHAIN outer surface for reassembly.
3. Timing chain.

INSTALL OR CONNECT

1. Intake camshaft sprocket onto camshaft with surface marked during removal showing.
2. Intake camshaft sprocket retaining bolt and washer, torque to 70 Nm (52 ft lbs) while holding the sprocket with J-39579 (if removed).
3. Timing pins, J-36008, through holes in camshaft sprockets into holes in timing chain housing to position camshafts for proper timing. If camshafts are out of position and must be rotated more that 1/8 turn to insert timing pins:

1. Crankshaft MUST be rotated 90°clockwise off of TDC in order to give the valves adequate clearance to open.
2. Once the camshafts are in position and the timing pins have been installed rotate crankshaft COUNTERCLOCKWISE to TDC. CAUTION: Do NOT rotate the crankshaft clockwise to TDC, valve or piston damage could occur.

1. Timing chain over exhaust camshaft sprocket, around idler sprocket and around crankshaft sprocket.
2. Set camshaft sprockets at timed position and install timing chain. Remove timing pin from intake camshaft. Using J-39579, rotate the intake camshaft sprocket counterclockwise until timing chain can be installed over sprocket. Release J-39579 after timing chain has been installed over sprocket. The length of chain between intake and exhaust camshaft sprockets should tighten. The timing pin should easily fit through intake camshaft sprocket timing hole into timing chain housing timing hole. If timing pin does not fully index, the camshafts are NOT timed correctly and the procedure MUST be repeated.
3. With timing pins installed, raise and support vehicle.
4. With slack removed from timing chain between intake camshaft sprocket and crankshaft sprocket, timing marks on crankshaft and engine block should be aligned. If the marks are not aligned, move timing chain one tooth forward or rearward to align marks. Remove slack and recheck marks.
5. Reload tensioner assembly to zero position as follows:

1. Form a keeper out of heavy gauge wire into a U-shaped piece with a half inch opening.
2. Apply slight force on tensioner blade to compress plunger.
3. Insert small screwdriver into reset access hole and pry rachet pawl away from ratchet teeth while forcing the plunger completely in the hole.
4. Install keeper between access hole and blade.

1. Tensioner assembly to chain housing and recheck plunger assembly installation, noting long end is toward crankshaft.
2. Tighten timing chain tensioner bolts to 10 Nm (89 in lbs) .
3. Lower vehicle to point where timing pins can be removed from camshaft sprockets.
4. Rotate crankshaft two revolutions in the clockwise direction. Align crankshaft keyway with the mark on cylinder block and reinstall timing pins through camshaft sprockets into housing timing holes. Timing pins should slide easily through timing holes. If timing pins cannot be inserted easily, repeat procedure to properly time engine. CAUTION: If the engine is not correctly timed, severe engine damage could occur.
5. Timing chain guides.
6. Engine front cover.
7. Negative battery cable.

Yes. It’s likely that the sprockets are worn. Putting a new chain non a worn pair of sprockets will make the chain wear out faster—and replacing the sprockets without replacing the chain will sear out the sprockets. Do them as a set.