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Adjusting the Variable Valve Actuator Lash
Note: The valve lash must be set prior to setting the lash for the variable valve actuator.
Use the following procedure to adjust the lash for the variable valve actuator:
- 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". The valve lash must be set before the lash of the variable valve actuator can be adjusted. Also, the valve cover base must be torqued before the lash of the variable valve actuator can be adjusted.
Table 2TC Compression StrokeInlet Rocker Arm
Variable Valve Actuator Lash
0.610 ± 0.075 mm (0.0240 ± 0.0030 inch)
Cylinders1-2-4
- Adjust lash for the variable valve actuator according to Table 2.
- Loosen the jam nut.
- Place the appropriate feeler gauge between the actuator piston and the rocker arm. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the actuator piston and the rocker arm. Continue turning the adjustment screw until the piston of the variable valve Actuator prevents the feeler gauge from being removed. There should be a tight hold on the feeler gauge. Turn the adjustment screw counterclockwise in order to loosen the feeler gauge. Refer to Table 2 for the correct variable valve actuator lash. Remove the feeler gauge.
- Tighten the jam nut to a torque of 50 ± 10 N·m (37 ± 7 lb ft). Do not allow the adjustment screw to turn while you are tightening the jam nut. Recheck the lash setting after tightening the jam nut.
- 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.
Table 3TC Exhaust StrokeInlet Rocker Arm
Variable Valve Actuator Lash
0.610 ± 0.075 mm (0.0240 ± 0.0030 inch)
Cylinders3-5-6
- Adjust lash for the variable valve actuator according to Table 3.
- Loosen the jam nut.
- Place the appropriate feeler gauge between the actuator piston and the rocker arm. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the actuator piston and the rocker arm. Continue turning the adjustment screw until the piston of variable valve actuator prevents the feeler gauge from being removed. There should be a tight hold on the feeler gauge. Turn the adjustment screw counterclockwise in order to loosen the feeler gauge. Refer to Table 3 for the correct variable valve actuator lash setting. Remove the feeler gauge.
- Tighten the jam nut to a torque of 50 ± 10 N·m (37 ± 7 lb ft). Do not allow the adjustment screw to turn while you are tightening the jam nut. Recheck the lash setting after tightening the jam nut.
- Remove the timing bolt from the flywheel after all adjustments have been made. Reinstall the timing cover.
Note: The valve lash must be adjusted before adjusting the compression brake, if equipped
Jakes
Note: The valve lash must be adjusted before adjusting the Cat compression brake lash.
Table 1
SettingTightening torque for the jam nut
0.9398 mm (0.037 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:
- 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.
- 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.
I hope this helps you.
Wayne