Valve Lash Check
An adjustment is not necessary if the measurement of the valve lash is in the acceptable range in Table 1.
| Inlet Valves | Exhaust Valves | |
|---|---|---|
| Valve Lash (Stopped Engine) | 0.38 ± 0.08 mm (0.015 ± 0.003 inch) |
0.76 ± 0.08 mm (0.030 ± 0.003 inch) |
| TC Compression Stroke | 1-2-4 | 1-3-5 |
| TC Exhaust Stroke (1) | 3-5-6 | 2-4-6 |
| Firing Order | 1-5-3-6-2-4 (2) | |
| ( 1 ) | 360° from TC compression stroke |
| ( 2 ) | The No. 1 cylinder is at the front of the engine. |
If the measurement is not within this range, an adjustment is necessary. Refer to “Valve Lash Adjustment” for the proper procedure.
Valve Lash Adjustment
Illustration 1 g01373511
Cylinder and valve location
(A) Exhaust valves
(B) Inlet valves
Use the following procedure to adjust the valve lash:
- Put the No. 1 piston at the top center position on the compression stroke. Refer to Testing and Adjusting, “Finding Top Center Position for No. 1 Piston”.
Table 2 TC Compression Stroke Inlet Valves Exhaust Valves Valve Lash 0.38 ± 0.08 mm
(0.015 ± 0.003 inch)0.76 ± 0.08 mm
(0.030 ± 0.003 inch)Cylinders 1-2-4 1-3-5
- Adjust the valve lash according to Table 2.
- Lightly tap the rocker arm with a soft mallet. This action will ensure that the lifter roller seats against the base circle of the camshaft.
- Loosen the adjustment locknut.
- Place the appropriate feeler gauge between rocker arm and the valve bridge. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the rocker arm and the valve bridge. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge. Remove the feeler gauge.
- Tighten the adjustment locknut to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Do not allow the adjustment screw to turn while you are tightening the adjustment locknut. Recheck the valve lash after tightening the adjustment locknut.
- Remove the timing bolt and turn the flywheel by 360 degrees in the direction of engine rotation. This action will put the No. 6 piston at the top center position on the compression stroke. Install the timing bolt in the flywheel.
Table 3 TC Exhaust Stroke Inlet Valves Exhaust Valves Valve Lash 0.38 ± 0.08 mm
(0.015 ± 0.003 inch)0.76 ± 0.08 mm
(0.030 ± 0.003 inch)Cylinders 3-5-6 2-4-6
- Adjust the valve lash according to Table 3.
- Lightly tap the rocker arm with a soft mallet. This action will ensure that the lifter roller seats against the base circle of the camshaft.
- Loosen the adjustment locknut.
- Place the appropriate feeler gauge between rocker arm and the valve bridge. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the rocker arm and the valve bridge. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge. Remove the feeler gauge.
- Tighten the adjustment locknut to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Do not allow the adjustment screw to turn while you are tightening the adjustment locknut. Recheck the valve lash after tightening the adjustment locknut.
- Remove the timing bolt from the flywheel after all adjustments to the valve lash have been made. Reinstall the timing cover.
Refer to Testing and Adjusting, “Electronic Unit Injector – Adjust”.
