Timing Chain & Sprockets: Removal
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Required Tools: Magnetic Base Dial Indicator (J-7872).
- Remove the engine front cover. See FRONT COVER .
- Attach the Magnetic Base Dial Indicator to the front of the engine cylinder block. See Fig 1. Position the magnetic base dial indicator to allow the plunger to contact the timing chain. The magnetic base dial indicator plunger should contact the timing chain centered between the 2 sprockets.
- Using finger pressure on the inside radius of the timing chain, push the timing chain outward (parallel to the front face of the block) to the maximum deflection. Set the Magnetic Base Dial Indicator to zero. Using finger pressure on the outside radius of the timing chain, push the timing chain inward (parallel to the front face of the block) to the maximum deflection.
- Note the deflection of the timing chain (total travel of the magnetic base dial indicator plunger).
- For used parts, the deflection must not exceed 0.80" (20.3 mm).
- For new parts, the deflection must not exceed 0.50" (12.7 mm).
- Remove the bolt from the timing chain sprocket to the camshaft. Remove the fuel injection pump drive gear from the timing chain sprocket. Remove the timing chain and sprocket from the camshaft. Remove the sprocket from the crankshaft.
- Inspect the timing chain sprocket key. Inspect the crankshaft gear key for damage. Replace the keys if damage is found.
NOTE:
Replace the timing chain sprocket key if there are signs of excessive wear or damage. Do not try to repair the key.