GEAR (54 Teeth) 1S5581 - Caterpillar

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.
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.
The engine valve lash and the injector lash must be within specifications prior to adjusting the lash for the CAT compression brake. Refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust" for the correct procedure for inspection of the engine valve lash. Refer to Testing and Adjusting, "Electronic Unit Injector - Adjust" for the proper procedure for inspection of the injector lash adjustment.Note: Adjustment of the lash for the CAT compression brake must be performed while the engine is cold. If the engine is warm, allow the engine to cool prior to performing the following adjustments.Note: The lash is measured between the rod for the CAT compression brake and the exhaust rocker arm. 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:
Illustration 1 g01102458
Exhaust rocker arm and actuator piston
(1) Adjustment screw
(2) Adjustment screw locknut
(3) Rod for the CAT compression brake
(4) Exhaust rocker arm
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".
Loosen adjustment screw locknut (2) and back out adjustment screw (1) until the CAT Compression Brake rod is not in contact with the exhaust rocker arm.
Make sure that the rod for the CAT compression brake is centered in the housing. Set the lash to 0.686 0.050 mm (0.0270 0.0020 inch). Place the appropriate feeler gauge between the rod for the CAT compression brake and the exhaust rocker arm. Turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the rod for the CAT compression brake and the exhaust rocker arm. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge. Remove the feeler gauge.
Torque the adjustment screw locknut. Tighten the locknut to 15 3 N m (11 2 lb ft).
Recheck the lash setting after you torque 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 5.
Remove the timing bolt from the flywheel after all adjustments have been performed. Reinstall the timing cover.