Valve Clearance Adjustment

Valve Clearance Adjustment

1. Remove the engine cover. Refer to Engine Cover Replacement (Service and Repair).
2. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement (4.3L, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L) (Engine Coolant Fan Upper Shroud Replacement) Engine Coolant Fan Upper Shroud Replacement (Diesel) (Engine Coolant Fan Upper Shroud Replacement).




3. Remove the fan clutch. Refer to Fan Clutch Replacement (Service and Repair).
4. Remove the upper valve rocker arm covers. Refer to Valve Rocker Arm Upper Cover Replacement - Left Side (Valve Rocker Arm Upper Cover Replacement - Left Side) and Valve Rocker Arm Upper Cover Replacement - Right Side (LMM) (Valve Rocker Arm Upper Cover Replacement - Right Side).
5. Rotate the crankshaft in order to bring the number 1 cylinder to top dead center (TDC) of the compression stroke. The number 1 cylinder is the front cylinder on the right bank. The mark on the crankshaft balancer should be aligned with the mark on the engine.




6. Loosen the valve adjusting screws.
7. Insert a feeler gauge between the tip of the rocker arm and the valve bridge.




8. Adjust the valve lash to 0.3 mm (0.012 in). Refer to Valve Clearance Adjustment Specifications (Adjustments) to determine which valves can be adjusted when the engine is at TDC.

Caution: Refer to Fastener Caution (Fastener Caution).

9. Tighten the lock nut to 22 Nm (16 lb ft).




10. Rotate the crankshaft one revolution in order to bring the number 1 cylinder to TDC of the exhaust stroke.




11. Loosen the valve adjusting screws.
12. Insert a feeler gauge between the tip of the rocker arm and the valve bridge.




13. Adjust the valve clearance to 0.3 mm (0.0112 in). Refer to Valve Clearance Adjustment Specifications (Adjustments) to determine which valves can be adjusted when the engine is at TDC.
14. Tighten the lock nut to 22 Nm (16 lb ft).
15. Install the upper valve rocker arm covers. Refer to Valve Rocker Arm Upper Cover Replacement - Left Side (Valve Rocker Arm Upper Cover Replacement - Left Side) and Valve Rocker Arm Upper Cover Replacement - Right Side (LMM) (Valve Rocker Arm Upper Cover Replacement - Right Side).
16. Install the fan clutch. Refer to Fan Clutch Replacement (Service and Repair).
17. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement (4.3L, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L) (Engine Coolant Fan Upper Shroud Replacement) Engine Coolant Fan Upper Shroud Replacement (Diesel) (Engine Coolant Fan Upper Shroud Replacement).
18. Install the engine cover. Refer to Engine Cover Replacement (Service and Repair).