Timing Cover: Service and Repair
REMOVAL PROCEDURE1. Raise and suitably support the vehicle.
2. Remove the electrical connectors from the fan shroud.
3. Drain the cooling system.
4. Drain the engine oil.
5. Lower the vehicle.
6. Disconnect the Intake Air Temperature (IAT) sensor electrical connector at the intake duct.
7. Disconnect the Mass Airflow (MAF) sensor electrical connector at the intake duct.
8. Remove the air intake duct.
9. Remove the air conditioning (A/C) drive belt.
Refer to Drive Belt Replacement (A/C).
10. Remove the upper radiator hose from the water pump.
11. Remove the radiator hose from the water inlet housing.
12. Remove the two heater hoses from the water pump.
13. Remove the upper radiator support.
14. Remove the fan shroud.
15. Remove the drive belt tensioner.
16. Remove the overflow hose from the radiator.
17. Remove the throttle body heater hose from the radiator.
18. Remove the drive belt idler pulley.
19. Remove the water pump.
20. Raise and suitably support the vehicle.
21. Remove the crankshaft balancer.
22. Remove the oil pan-to-front cover bolts.
23. Remove the engine front cover bolts.
24. Remove the front cover and gasket.
25. Remove the crankshaft oil seal from the cover.
26. Inspect for the following:
^ Gasket sealing surfaces from excessive scratches or gouging.
^ Cover-to-oil pan threaded bolt holes for damaged threads or debris.
^ Crankshaft oil seal mounting bore for damage.
^ Oil pan gasket for damage.
INSTALLATION PROCEDURE
^ Tools Required
- J41476 Front and Rear Cover Alignment (Crankshaft Oil Seal Area)
1. Apply a 5 mm (0.20 inch) bead of sealant GM P/N 12378190 or equivalent 20 mm (0.80 inch) long to the oil pan to engine block junction.
IMPORTANT:
^ Do not reuse the crankshaft oil seal or the engine front cover gasket.
^ All gasket surfaces should be free of oil or other foreign material during assembly.
^ The crankshaft front oil seal MUST be centered in relation to the crankshaft.
An improperly aligned front cover may cause premature front oil seal wear and/or engine assembly oil leaks.
2. Install a new crankshaft oil seal to the front cover.
3. Install the front cover gasket and cover.
4. Install the front cover bolts finger tight. Do not overtighten.
5. Install the J41476.
IMPORTANT: Align the tapered legs of the J41476 with the machined alignment surfaces on the front cover.
NOTICE: Refer to Fastener Notice in Service Precautions.
^ Tighten the oil pan-to-front cover bolts to 25 Nm (18 ft. lbs.).
^ Tighten the engine front cover bolts to 25 Nm (18 ft. lbs.).
6. Remove the J41476.
7. Install the crankshaft balancer.
8. Lower the vehicle.
9. Install the water pump.
10. Install the drive belt idler pulley.
11. Install the throttle body heater hose to the radiator.
12. Install the overflow hose to the radiator.
13. Install the drive belt tensioner.
14. Install the fan shroud.
15. Install the upper radiator support.
^ Tighten the radiator support/air cleaner bolts to 12 Nm (106 inch lbs.).
16. Install the lower radiator hose to the water inlet housing.
17. Install the upper radiator hose to the water pump.
18. Install the A/C drive belt.
19. Install the two heater hoses to the water pump.
20. Install the air intake duct.
21. Connect the MAF sensor electrical connector at the intake duct.
22. Connect the IAT sensor electrical connector at the intake duct.
23. Refill the engine oil.
24. Refill the cooling system.
25. Install the electrical connectors to the fan shroud.