How do i get the timing gear on the crankshaft

1. Using the crankshaft gear bolt, rotate the crankshaft clockwise until the timing mark on the crankshaft gear is aligned with the notch at the bottom of the rear timing belt cover, see diagram below.
2. 
   

1. Remove all spark plugs so that the crank shaft could be rotated easily.
2. Rotate the crankshaft to align the timing mark of the crankshaft gear with the index mark on the engine cover.
3.Rotate the crankshaft +/- 30 degrees to ensure that the valve could not hit the pistons when aligning the camshaft gears.
4. Align the camshafts as described below.
5. Align the crankshaft timing gear with the index mark.
6. Loose and lock the timing bearing at its farther position. Install a timing belt starting from the crankshaft gear, then right cam, then left cam, and at last the timing bearing.
7. Press and hold the timing belt to keep it firm on the gears and loosen the timing bearing. It will get adjusted by itself with the help of spring attached to it. Do not put extra force on the bearing to adjust it more.
8. Confirm the timing marks.

Here is the procedure:-

1. Remove setscrew from side of cylinder block.



2. Remove oil pipe attaching bolts.



3. Remove oil pump and strainer.

TIMING GEAR COVER

1. Remove timing gear cover to case attaching bolts.



2. Remove timing gear cover and gasket.

CAMSHAFT, CRANKSHAFT, IDLER & INJECTION PUMP GEARS

1. Remove oil slinger and washers from crankshaft snout.
   

Using puller set 49 0839 425C or equivalent, remove crankshaft timing gear, Fig. 3.

1. Position a clean rag between camshaft and idler gears, then remove cam gear lock bolt and washers.



2. Using puller set 49 0839 425C or equivalent, remove cam gear from camshaft, Fig. 3.



3. Remove idler gear to spindle retaining nuts and washers, then remove idler gear and spindle assemblies.



4. Remove injection pump drive gear.



5. Remove timing gear case to cylinder block attaching bolts, then the timing case.

CAMSHAFT

1. Remove tappets from cylinder block.



2. Remove camshaft thrust plate to cylinder block retaining bolts and washers, then pull camshaft from block.

PISTON & CONNECTING ROD

1. Remove connecting rod bearing cap retaining nuts and bolts, then separate bearing cap from connecting rod.



2. Using the wooden handle end of a hammer, push the piston and connecting rod assembly outward until piston rings clear cylinder bore. Remove piston and connecting rod assembly through top of cylinder block.



3. To separate piston from connecting rod, remove piston pin retaining clips, then press pin from piston using a suitable driver.

CRANKSHAFT

1. Remove rear oil seal cap retaining bolts, then the cap and seal.



2. Remove main bearing cap to cylinder block retaining bolts, then the main bearing caps and thrust washers.



3. Lift crankshaft from cylinder block.

I’m happy to assist further over the phone at https://www.6ya.com/expert/uttamjeet_2f3adc18600f8ede

The crankshaft doesn't. But the gear that goes on it does. It is a small triangle or a dot.

Chain

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REMOVAL & INSTALLATION

4.3L, 5.0L, 5.7L and 7.4L Engines
See Figures 1, 2, 3, 4, 5 and 6

1. Remove the timing cover. This will allow access to the timing chain.
2. Crank the engine until the timing marks on both sprockets are nearest each other and in line between the shaft centers.

Fig. Fig. 1: Crank the engine until the timing marks on both sprockets are in line

1. On 1996-98 vehicles remove the crankshaft position sensor reluctor ring, if equipped. On 7.4L engines tool J-41371 or its equivalent puller must be used to remove the reluctor ring.
2. Take out the bolts that hold the camshaft gear to the camshaft. This gear is a light press fit on the camshaft and will come off easily. It is located by a dowel. The chain comes off with the camshaft gear.

Fig. Fig. 2: Remove the camshaft gear retaining bolts

Fig. Fig. 3: Remove the camshaft gear and timing chain
A gear puller will be required to remove the crankshaft gear.
To install:

1. Without disturbing the position of the engine, mount the new crankshaft gear on the shaft, and mount the chain over the camshaft gear. Arrange the camshaft gear in such a way that the timing marks will line up between the shaft centers and the camshaft locating dowel will enter the dowel hole in the cam sprocket.
2. Place the cam sprocket, with its chain mounted over it, in position on the front of the truck and pull up with the three bolts that hold it to the camshaft.
3. After the gears are in place, turn the engine two full revolutions to make certain that the timing marks are in correct alignment between the shaft centers. Tighten the camshaft sprocket bolts (and nut on the 4.3L) to 21 ft. lbs. (28 Nm) on 1988-95 models. On 1996-98 models, tighten the bolts to 18 ft. Lbs. (25 Nm). On the 7.4L, tighten them to 20 ft. lbs. (26 Nm) on 1988-95 models. On 1996-98 models, tighten the bolts to 25 ft. Lbs. (34 Nm).

When installing the crankshaft position sensor you must use install a new oil ring seal onto the sensor.

1. Install the crankshaft position sensor reluctor ring (if equipped), onto the crankshaft until it is firmly seated against the crankshaft sprocket. On 1996-98 7.4L vehicles replace the reluctor ring with a new component.
2. Install the front cover, torsional damper, water pump and the radiator.

Fig. Fig. 4: A gear puller will be required to remove the crankshaft gear

Fig. Fig. 5: Timing mark alignment-4.3L, 5.0L, 5.7L and 7.4L engines

from autozone.com

Removal & Installation

1. Before servicing the vehicle, refer to the Precautions Section.
2. Disconnect the negative battery cable.
3. Disconnect the Manifold Air Temperature (MAT) sensor connector.
4. Disconnect the air cleaner outlet hose from the throttle body.
5. Disconnect the breather tube from the camshaft cover.
6. Remove the air cleaner housing bolts.
7. Remove the air cleaner housing.
8. Remove the right front wheel.
9. Remove the right front wheel well splash shield.
10. Remove the serpentine drive belt.
11. Remove the crankshaft pulley bolts and the crankshaft pulley.
12. Remove the right engine mount bracket.
13. Remove the front timing belt cover bolts.
14. Remove the front timing belt cover.
15. Using the crankshaft gear bolt, rotate the crankshaft clockwise until the timing mark on the crankshaft gear is aligned with the notch at the bottom of the rear timing belt cover.
    

Fig. Aligning the timing mark on the crankshaft gear with the notch at the bottom of the rear timing belt cover.

1. Fig. Aligning the camshaft gears with the notches on the camshaft cover.
3. Align the camshaft gears with the notch on the camshaft cover.
4. Remove the timing belt.
5. Loosen the automatic tensioner bolt. Turn the hex-key tab to relieve belt tension.
6. 
   

To install:

1. Align the timing mark on the crankshaft gear with the notch on the bottom of the rear timing belt cover.
2. Align the timing marks on the camshaft gears, using the intake gear mark for the intake gear and the exhaust gear mark for the exhaust gear.
3. Install the timing belt.
4. Turn the hex-key tab in a clockwise direction to tension the belt. Turn until the pointer aligns with the notch.
5. Install the automatic tensioner bolt and tighten to 18 ft. lbs. (25 Nm).
6. Rotate the crankshaft two full turns clockwise using the crankshaft pulley bolt.
7. Recheck the automatic tensioner pointer.
8. Install the front timing belt cover.
9. Install the front timing belt cover bolts and tighten to 53 inch lbs. (6 Nm).
10. Install the right engine mount bracket.
11. Install the crankshaft pulley and tighten the crankshaft pulley bolts to 15 ft. lbs. (20 Nm).
12. Install the serpentine drive belt.
13. Install the right front wheel well splash shield.
14. Install the right front wheel.
15. Install the air cleaner housing.
16. Install the air cleaner housing bolts and tighten to 89 inch lbs. (10 Nm).
17. Connect the air cleaner outlet hose to the throttle body.
18. Connect the breather tube to the camshaft cover.
19. Connect the MAT sensor connector.
20. Connect the negative battery cable.

The wood-ruff key is used to keep the crankshaft timing gear in place and on time with the crankshaft, and it does not matter if the engine has a timing belt or a chain because they both use a wood-ruff key to hold the crankshaft timing gear/cog in place on the crankshaft, and if the key is missing or it has been sheered off, then the timing gear will be able to turn on the crankshaft and the engine will loose the timing between the camshaft and the crankshaft. The wood-ruff key is located in a groove on the crankshaft, and the timing gear/cog has a notch cut into it so that it will slide onto the crankshaft and over the wood-ruff key locking the timing chain gear/cog into that position on the crankshaft.

1989–92 VEHICLES

1. Disconnect the negative battery cable.
2. Remove the serpentine belt and timing belt cover.
3. Loosen the water pump bolts and release tension with tool J–33039 or equivalent.
4. Raise and support the vehicle safely.
5. Remove the crankshaft pulley.
6. Carefully lower the vehicle, then remove the timing belt. Fig. 11: Exploded view of the timing belt assembly — 1989–92 OHC engines
   To install:
   
7. Turn the crankshaft and the camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
8. Install the timing belt, making sure the portion between the camshaft gear and crankcase gear is in tension.
9. Using tool J–33039 or equivalent, turn the water pump eccentric clockwise until the tensioner contacts the high torque stop. Tighten the water pump screws slightly.
10. Turn the engine by the crankshaft gear bolt 720°to fully seat the belt into the gear teeth.
11. Turn the water pump eccentric counterclockwise until the hole in the tensioner arm is aligned with the hole in the base.
12. Tighten the water pump screws to 18 ft. lbs. (24 Nm), while checking that the tensioner holes remain as adjusted in the prior step.
13. Install the crankshaft pulley, timing belt cover and the serpentine drive belt.

1993–94 VEHICLES

1. Disconnect the negative battery cable, then partially drain and recover the cooling system.
2. Remove the coolant recovery reservoir.
3. If equipped, remove the A/C belt.
4. Remove the serpentine belt.
5. Disconnect the evaporative emission pipe assembly.
6. Remove the crankshaft pulley assembly.
7. As outlined earlier, remove the timing belt front cover.
8. Align the marks on the crankshaft sprocket with the marks on the rear timing belt cover by rotating the crankshaft.
9. Loosen the water pump retaining bolts, and release the tension with tool J 33039-A or equivalent.
10. Carefully lower the vehicle, then remove the timing belt. Fig. 12: Timing belt installation and tightening specifications — 1993–94 2.0L OHC engines
    To install:
    
11. Turn the crankshaft and camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
12. Install the timing belt, making sure that the portion between the camshaft gear and crankshaft gear is in tension.
13. Using tool J 33039-A, or equivalent adjustment tool, turn the coolant pump eccentric clockwise until the tensioner arm contacts the high torque stop. Tighten the water pump screws slightly.
14. Turn the engine by the crankshaft gear bolt 720°clockwise to fully seat the belt into the gear teeth.
15. Turn the coolant pump eccentric counter clockwise until the hole in the tensioner arm is aligned with the hole in the base. This must be done with the engine at room temperature, approximately 68°F (20°C).
16. Tighten the water pump screws while checking that the tensioner holes remain as adjusted as in step 15.
17. As outlined earlier, install the timing belt cover.
18. Install the crankshaft pulley.
19. Connect the evaporative emission pipe assembly.
20. Install the serpentine drive belt and the A/C belt (if equipped).
21. Install the coolant recovery reservoir.
22. Properly fill the cooling system, then connect the negative battery cable.

Removing the camshaft gear from the 6-300


Removing the crankshaft gear from the 6-300




Installing the camshaft gear on the 6-300



Installing the crankshaft gear on the 6-300



6-300 timing gear mark alignment

1. Drain the cooling system and remove the front cover.
   

CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

1. Crank the engine until the timing marks on the camshaft and crankshaft gears are aligned.
   
2. Use a gear puller to removal both of the timing gears.
   
3. Before installing the timing gears, be sure that the key and spacer are properly installed. Align the gear key way with the key and install the gear on the camshaft. Be sure that the timing marks line up on the camshaft and the crankshaft gears and install the crankshaft gear.
   
4. Install the front cover, and assemble the rest of the engine in the reverse order of disassembly. Fill the cooling system.
   

Timing belt removed, static timing was not set before removing timing belt.

[Set Static Timing:
No.1 piston is brought up to TDC before removing timing belt.

Cam gear has a punchmark on face of gear, and this mark aligns with one single tooth. There is a matching punchmark on the Timing Belt Rear Upper Cover.

Facing the cam gear, the mark is to the upper right. There is an 'egg shape' of the timing belt upper rear cover, in this spot. This punchmark is in that 'egg shape', and is close to a bolt hole. The cam gear mark lines up with the Timing Belt Rear Upper Cover, mark.

The crankshaft gear has a punchmark on the face. It lines up with one single tooth. There is a corresponding punchmark on the lower right side. An alignment mark)

Should be a round punchmark on the face of the crankshaft gear. It lines up with a single tooth. Wipe the gear clean, use a little carb cleaner. (NO flames, or sparks nearby, well ventilated area)

Barring you cannot find the crankshaft mark, find the camshaft alignment marks, make sure they are aligned with the alignment, (Punchmark), on the Timing Upper Rear Cover.

Count the teeth in the timing belt. There should be 133 teeth on the belt.

There is 43 teeth in-between the timing mark of the camshaft, and the timing mark on the crankshaft.

(43 teeth in-between the Right Side Camshaft mark to crankshaft mark, 43 teeth in-between the Left Side Camshaft mark to crankshaft mark)

There should be 40 teeth in-between the two cam gears.