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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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This engine uses high voltage to control the fuel injectors. Disconnect electronic fuel injector enable circuit connector to prevent personal injury. Do not come in contact with the fuel injector terminals while the engine is running. |
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Note: The valve lash must be adjusted before adjusting the Cat compression brake lash.
| Setting | Tightening torque for the jam nut |
0.864 ± 0.050 mm (0.0340 ± 0.0020 inch) |
15 ± 3 N·m (11 ± 2 lb ft) |
Refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust".
Note: The Cat compression brake lash is measured between the Cat compression brake pin and the exhaust rocker pad. Make all adjustments while the engine is stopped and the exhaust valves are closed.
Use the following procedure to adjust the slave piston lash on cylinders 1, 3, and 5:
- 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".
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| Illustration 1 | g00948608 |
Exhaust rocker arm and actuator piston | |
- Loosen the jam nut (1) .
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| Illustration 2 | g00960221 |
Assembly for the variable valve actuator (1) Jam nut (2) Housing for the slave piston | |
- Make sure that the Cat compression brake pin is centered in the housing. Place the appropriate feeler gauge between the Cat compression brake pin and the exhaust rocker pad. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the Cat compression brake pin and the exhaust rocker pad. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge. Remove the feeler gauge.
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| Illustration 3 | g01018798 |
An example of incorrect centering of the Cat compression brake pin | |
- Tighten jam nut (1) to a torque of 15 ± 3 N·m (11 ± 2 lb ft). Recheck the slave piston lash after tightening the 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.
To adjust the slave piston lash on cylinders 2, 4, and 6, perform Steps 2 through 4.
- Remove the timing bolt from the flywheel after all adjustments have been performed. Reinstall the timing cover.
Refer to Troubleshooting, "Retarder (Compression Brake) Solenoid Circuit - Test".
Refer to Testing and Adjusting, "Electronic Unit Injector - Adjust".