Inspection - Triumph Thunderbird Service Manual

6. Remove the camshaft drive chain from the idler gear.
Inspection
An in-situ check can be made as follows:
1. Check for significant blue discolouration 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.
ccrv
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.
cajs
Cylinder Head
3. Measure across 23 links as shown in the diagram. 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.
ca~
4. Check for severe wear of the inner surface of the
outer plates at the side-contact points with the
sprocket teeth.
ecru
5. Check for signs of stiffness or kinking.
6. Check for severe wear of the plates in the area
shown below.
caju
Service Manual - Thunderbird
3.11