Timing Chain: Service and Repair

Timing Gears

Warning: To prevent possible damage to the camshaft lobes, do not rotate the camshaft or crankshaft in the engine without timing gears installed.

CAMSHAFT GEAR

Removal

1. Drain the cooling system and crankcase.

2. Remove the cylinder front cover following the procedures under Cylinder Front Cover Removal. Refer to Service and Repair

3. Check the camshaft end play, the timing gear backlash and the timing gear runout.

4. Crank the engine until the timing marks are aligned as shown.






5. Install the Camshaft Gear Puller T82T-6256-A as shown and remove the camshaft gear.






Installation

If the camshaft end play, timing gear backlash and/or timing gear runout were excessive, make the necessary corrections before installing the gear.


1. Make sure the key spacer and thrust plate are properly installed. Align the gear keyway with the key and install the gear on the camshaft using Camshaft Gear Replacing Adapter T65L-6306-A. Make sure that the timing marks line up on the camshaft and crankshaft gears.






2. Install the cylinder front cover and related parts following the procedures under Cylinder Front Cover Installation. Refer to Service and Repair

3. Fill the crankcase and cooling system. Start the engine and adjust the ignition timing. Operate the engine at fast idle and check all hose connections and gaskets for leaks.


CRANKSHAFT GEAR

Removal

1. Drain the cooling system and crankcase.

2. Remove the cylinder front cover. Refer to Service and Repair

3. Crank the engine until the timing marks are aligned.






4. Use Crankshaft Damper Remover T58P-6316-D and remove the crankshaft gear. Remove the key from the crankshaft.






Installation

1. Install the key in the crankshaft keyway. Install the crankshaft gear using the Crankshaft Damper Replacer T52L-6306-AEE. Make sure timing marks are aligned properly on the camshaft and crankshaft gears. Install the oil slinger.






2. Replace the crankshaft front oil seal. Install the cylinder front cover following the procedures under Cylinder Front Cover. Refer to Service and Repair

3. Install the radiator.

4. Fill the crankcase and the cooling systems. Start the engine and check all gaskets and hose connections for leaks. Adjust the ignition timing and curb idle to the specifications on the engine decal.