Timing Cover: Service and Repair

Removal Procedure

Notice: Perform TDC Offset Recovery procedure if the timing chain, timing gears, engine front cover, crankshaft position sensor, crankshaft or other components affecting the timing are replaced.

1. Disconnect the battery negative cables from the batteries.
^ For the front battery, refer to Battery Cable Replacement (Battery Cable Negative) in Starting and Charging.
^ For the auxiliary battery, refer to Battery Cable Replacement (Battery Cable Aux. Negative) in Starting and Charging.

2. Drain the cooling system.
3. Remove the fan shroud from the radiator.
4. Remove the drive belt from the pulleys.
5. Raise the vehicle and support with a safety stand.
6. Remove the water pump from the engine block.
7. Remove the crankshaft balancer from the crankshaft.





8. Remove the crankshaft position sensor from the engine front cover.





9. Remove the fuel injection drive gear from the fuel injection pump.

Important: Mark the fuel line clips, so that they can be re-installed on the proper stud.





10. Remove the bolts from the engine front cover.





11. Remove the engine front cover from the engine block.
12. Clean and inspect the sealing surface of the engine block.

Installation Procedure

^ Tools Required
- J 22102 Front Cover Seal Installer





1. Use the J 22102 to install the new front crankshaft front oil seal.





2. Apply a 2 mm (3/32 inch) bead of anaerobic sealant GM P/N 1052357 or equivalent to the engine front cover.
3. Apply a 5 mm (3/16 inch) bead of RTV sealant to the engine front cover sealing the surface that mates against the oil pan.





4. Install the engine front cover to the engine block.

Notice: Refer to Fastener Notice in Service Precautions.





5. Install the engine front cover bolts.
^ Tighten the nuts to 40 Nm (30 ft. lbs.).





6. Install the attaching bolts and the fuel injection pump studs.
^ Tighten the nuts to 40 Nm (30 ft. lbs.).





7. Install the fuel injection pump drive gear and bolts to the fuel injection pump.
^ Tighten the bolts to 25 Nm (20 ft. lbs.).
8. Install the crankshaft balancer to the crankshaft.





9. Install the crankshaft position sensor to the engine front cover.
10. Install the water pump to the engine block.
11. Remove the safety stands and lower the vehicle.
12. Install the drive belt on the pulleys.
13. Install the fan shroud to the radiator.
14. Fill the cooling system.
15. Connect the battery negative cables to the batteries.
16. Perform the TDC offset adjustment.