Removal
1. Remove the camshafts (see page 3-13).
2. Remove the bolt from the centre of the camshaft drive chain housing in the cylinder head.
1. Centre bolt
3. Remove the fixing and raise the front camshaft drive chain rubbing blade and detach the camshaft drive chain from the crankshaft gear.
4. The camshaft drive chain is removed from inside the head-space.
Inspection
Visual in-situ checks can also be made as follows:
1. Check for significant discoloration of the chain plates indicating excessive heat build-up.
2. Examine all pins for signs of rotation.
3. Check for cracking or deep scratching of the chain plates.
4. Check for severe wear of the inner plates as indicated in the diagram below.
For a more thorough check, proceed as follows:
1. Remove the chain from the engine.
2. Suspend the chain from a pin or hook with a 13 kg weight attached at the lower end.
3. Measure across 23 links as shown in the diagram below. If the chain is within limits, the measurement should be no longer than 149.48 mm.
Measurements beyond 149.48 mm indicate that the chain must be replaced.
4. Check for severe wear of the inner surface of the outer plates at the side-contact points with the sprocket teeth.
5. Check for signs of stiffness or kinking.
6. Check for severe wear of the plates in the area shown below.
If any of these symptoms are evident, the camshaft drive chain must be replaced.
Installation
1. Fit the camshaft drive chain and locate the lower end around the crankshaft gear.
2. Incorporating a new seal, refit the bolt to the centre of the camshaft drive chain housing in the cylinder head, tightening to 12 Nm.
3. Refit the camshafts (see page 3-15).