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To prevent possible injury, do not use the starter to turn the flywheel. Hot engine components can cause burns. Allow additional time for the engine to cool before measuring valve clearance. |
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Note: Valve lash is measured between the rocker arm and the valve. All measurements and adjustments must be made with the engine stopped and the valves FULLY CLOSED.
Valve Lash Check
An adjustment is NOT NECESSARY if the measurement of the valve lash is in the acceptable range in Table 1.
| Valve Lash Check (Stopped Engine) | |
| Inlet | 0.30 to 0.46 mm (0.012 to 0.018 inch) |
| Exhaust | 0.56 to 0.72 mm (0.022 to 0.028 inch) |
If the measurement is not within this range, an adjustment is necessary. Refer to "Valve Lash Adjustment" for the proper procedure.
Valve Lash Adjustment
| Valve Lash Setting (Stopped Engine) | |
| Inlet | 0.38 mm (0.015 inch) |
| Exhaust | 0.64 mm (0.025 inch) |
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| Illustration 1 | g00821000 |
Cylinder and valve location (A) Exhaust valves (B) Inlet valves | |
Use the following procedure to adjust the valve lash:
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| Illustration 2 | g00708315 |
Valve adjustment (typical example) (1) Valve (2) Rocker arm (3) Adjustment locknut (4) Adjustment screw | |
- 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".
- With the No. 1 piston at the top center position of the compression stroke, an adjustment can be made to the valves. Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the information that is required in order to adjust the valves.
Note: Before any actual adjustment is made, lightly tap the rocker arm at the top of the adjustment screw with a soft mallet. This will ensure that the lifter roller seats against the camshaft's base circle.
- Loosen adjustment locknut (3) .
- If there is not enough clearance in order to insert the feeler gauge between rocker arm (2) and valve (1), turn adjustment screw (4) counterclockwise in order to increase the clearance.
- Place the appropriate feeler gauge between rocker arm (2) and the valve (1). Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the rocker arm and the valve. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge. Remove the feeler gauge.
- Tighten adjustment locknut (3) 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 will put the No. 6 piston at the top center position on the compression stroke. Install the timing bolt in the flywheel.
- Adjust the valve lash on the remaining valves. Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the information that is required in order to adjust the valves.
- Repeat Step 3 through Step 6 for these valve adjustments.
- 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, "Unit Injector - Adjust".