Description

Description

Camshafts

Inlet and exhaust camshafts in each head are chain driven directly from the crankshaft.

The twin crankshaft sprocket has 18 teeth and each camshaft sprocket has 36 teeth, the timing chains have 61 links. Three chain links are marked and are aligned with timing marks on the crankshaft and camshaft sprockets during valve timing. Because of the odd number of links in the timing chains, the timing marks and marked links will only align once every 122 engine revolutions.

Specifications

Maintenance

Valve Timing Chains

Removal

1. Remove the engine from the vehicle (Refer to 'Engine', page 3-1-4).
2. Remove the camshaft covers (Refer to 'Camshaft Cover', page 3-11-1)
3. Remove the timing cover (Refer to 'Timing Cover', page 3-11-3).
4. Remove the crankshaft timing disc.

Note the orientation of the disc for installation.

Image to Follow

5. Turn the crankshaft to place the crankshaft key in the vertical position.

Caution
The crankshaft key must remain in the vertical position until the camshaft chains are correctly installed and tensioned. Movement of the crankshaft before completion of valve timing may cause contact between a piston and a valve, resulting in valve and / or piston damage.

The crankshaft key is exactly in line with No.1 crankshaft throw. With the crankshaft key vertical, No.1 piston is 30° ATDC and all pistons are below engine block surface.