Timing Cover: Service and Repair

REMOVAL PROCEDURE





1. Disconnect the battery negative cable from the battery.

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.

2. Drain the cooling system.
3. Remove the upper fan shroud from the radiator.
4. Remove the drive belt from the vehicle.
5. Raise the vehicle and support with a safety stand.
6. Remove the lower fan shroud from the radiator.
7. Remove the water pump from the engine block.
8. Remove the crankshaft balancer from the crankshaft.
9. Remove the crankshaft position sensor from the engine front cover.
10. Remove the fuel injection drive gear from the fuel injection pump.





11. Remove the bolts from the engine front cover.

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





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

INSTALLATION PROCEDURE





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





2. Install the engine front cover to the engine block.
^ Apply a 2 mm (3/32 inch) bead of anaerobic sealant GM P/N 1052357 or equivalent to the engine front cover.
^ 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.





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





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

NOTICE: Refer to Fastener Notice in Service Precautions.





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

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