Question about GMC K1500

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How to set the timing on 1998 GMC Sierra 5.7 - K1500 GMC Cars & Trucks

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  • GMC Master
  • 6,826 Answers

5.0L and 5.7L Engines To Remove:

  1. Remove the crankshaft balancer.
  2. Drain the cooling system.
  3. Remove the water pump.
  4. Drain the engine oil.
  5. Remove all engine oil pan fasteners except two nuts at rear of engine.
  6. Separate the engine oil pan from the front cover.
  7. Disconnect the crankshaft position (CKP) sensor wire. How to set the timing - gm-03-50-845.gif

  8. Remove engine front cover. gm-03-50-849.gif

  9. Pry the oil seal from the front cover.
  10. Inspect the front cover seal area and crankshaft balancer seal area for damage.

  11. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned.
  12. Remove the crankshaft position sensor reluctor ring. gm-03-50-847.gif

    NOTE: Free play on the slack side of the camshaft timing chain must measure less than 0.43 inch (11Mm) or timing chain and sprockets must be replaced.
  13. Remove the camshaft sprocket bolts.
  14. Remove the camshaft sprocket.
  15. Remove the camshaft timing chain. NOTE: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.
    gm-03-50-848.gif

  16. Remove the crankshaft sprocket using J 5825-A.
  17. Remove the crankshaft balancer woodruff keys (if required).
To Install:
gm-03-50-850.gif

  1. Install the crankshaft balancer woodruff keys into the crankshaft.
  2. Align the crankshaft sprocket keyway with the crankshaft balancer woodruff key. WARNING
    Wear eye protection when installing crankshaft sprocket.
    How to set the timing - gm-03-50-851.gifp://arrc.epnet.com/autoapp/CHEVY_CK-PICK_96-98_F/p5images/G/GM-03-50-851L.gif">gm-03-50-851.gif

  3. Use J 5590 to install crankshaft sprocket.
  4. Install the camshaft sprocket and camsHow to set the timing - 9308kg61.gifchain. 9308kg61.gif

  5. Ensure that the crankshaft sprocket alignment mark is in the 12 o'clock position and the camshaft sprocket alignment mark is at the 6 o'clock position.
  6. Install the camshaft sprocket bolts and tighten the camshaft sprocket bolts;
    • Torque to: 18 ft. lbs. (25 Nm)
  7. Install the crankshaft position sensor reluctor ring until completely seated against crankshaft sprocket. NOTE: The composite type engine front cover and seal must not be reused. Always install a new engine cover with a new seal.
  8. Install new engine front cover and bolts.
    • Torque bolts to: 106 in. lbs. (12 Nm)
  9. Clean sealer from corners of oil pan gasket wHow to set the timing - gm-03-50-775.gife engine front cover. gm-03-50-775.gif

  10. Apply a 0.196 in (5 mm) bead of adhesive, GM P/N 12346141 or equivalent, 1.0 in (25 mm) long to the engine front cover to engine block junction.
  11. Install oil pan bolts.
    • Torque bolts to: 106 in. lbs. (12 Nm)
  12. Tighten oil pan nuts.
    • Torque bolts to: 18 ft. lbs. (25 Nm)
  13. Connect the crankshaft position sensor wire.
  14. Install the water pump.
  15. Install the crankshaft balancer.
  16. Fill the engine to the proper level with oil.
  17. Fill the engine to the proper level with coolant.
  18. Test drive the vehicle to confirm the repairs.

Posted on Nov 05, 2010

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6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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Anonymous

  • 12 Answers

SOURCE: removal of power steering pump on 1998 GMC Sierra 1500

you need a power steering pump puller the rest is simple any trouble let me know

Posted on Dec 24, 2008

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: how to set timing on 1998 gmc sierra

The v-8's timing is supposed to be 0 degrees plus or minus 2 degrees and is only adjustable if you have a scanner. A timing light does not work on them.
These engines can be "timed" in the way you are used too.
The distibutor housing holds the cam sensor, The PCM calculates the timing by measuring the crank signal and the cam signal.

What you are seting by turning the distibutor housing is the correlation between the 2 sensors. On the V-6 model, the housing holddown bracket is fixed to the housing so if you return the rotor to the proper position when reinstalling the housing, the engine should be at the correct cam sensor position setting.they did not fix the holddown bracket to the V-8 models, it would have saved a lot of headaches.
To set the correlation between the 2, you will need a scan tool that can read camshaft position offset. With the engine RPM over 1200 adjust the offset too 0 degrees.
TEST PROCEDURE
The ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following:

With the ignition OFF, install a scan tool to the DLC.
Start the engine and bring to normal operating temperature. IMPORTANT: Cam ****** Offset reading will not be accurate below 1000 RPM.
Increase engine speed to 1000 RPM.
Monitor the Cam ****** Offset.
If the Cam ****** indicates a value of 0°+/-2°, the distributor is properly adjusted.
If the Cam ****** does not indicate 0°+/-2°, the distributor must be adjusted.

ADJUSTING PROCEDURE
With the engine OFF, slightly loosen the distributor hold down bolt. IMPORTANT: Cam ****** Offset reading will not be accurate below 1000 RPM.
Start the engine and raise engine speed to 1000 RPM.
Using a scan tool monitor Cam ****** Offset.
Rotate the distributor as follows:
4.1. To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
4.2. To compensate for a positive reading, rotate the distributor in the clockwise direction.

Repeat step 4 until 0°+/-2°, is obtained.
Turn the ignition OFF.
Tighten the distributor hold-down bolt to 3 Nm (25 lb. ft.).
Start the engine, raise engine speed to 1000 RPM and recheck Camshaft ****** Offset.

Thank you for using fixya and good luck.

Posted on May 09, 2010

Anonymous

  • 13 Answers

SOURCE: 1998 GMC Sierra radio and display stays on all the time

First of all...does your truck have the retained accessory power (RAP)? If it does, the radio would always stay on with the key off until you open the drivers door. If it does have RAP and the door pin on the drivers door has went bad, then the truck doesn't know that you opened the door and continues to allow accessory power (although it would still cut off after about 20 minutes). If the interior lights come on when you open the door, then the pin is ok. If the lights come on, it could be the RAP relay. If it has gone bad, it is possible it is stuck supplying power and needs replacing. The relay should be labeled in the fuse panel, and there should be other relays in the panel with the same part number. You can swap a relay for the RAP relay and see if it fixes the problem...if it does fix it swap the relays back and replace the RAP relay. If the truck doesn't have RAP then it is possible the problem is in the radio..if you have a friend with a GM car or truck close to the same year you could swap radios and see if that fixes your problem...should be pretty simple. pull the cover off the dash, it just clips on, take out a couple screws that hold in the radio, unplug it and plug in the other radio. sorry so long winded...hope this helps you somewhat.

Posted on Mar 13, 2009

Jonah Oneal

  • 14092 Answers

SOURCE: presure oil with my 1998 gmc sierra

18 PSI IS WHAT IT SUPPOSE TO BE.BUT 2 PSI MORE COULD BE YOUR OIL TOO THICK.

Posted on Jun 12, 2009

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: 2004 GMC Sierra 4dr truck. the fan does not work

The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.

Posted on Jan 06, 2010

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