PRO TECHNICIAN

Disassembly

Inspect Timing Chain

Vernier calipers
Timing chain
Spring balance
Pin
Bush
 
Inspect degree of elongation of timing chain
Hang the chain from any hook on the wall. Next, pull the chain by applying a constant pressure with a spring balance. Using vernier calipers, measure the reference number of guides of length.
 
As the pin and bushing wear, free play increases. This results in stretching of the timing chain as a whole.
Therefore, measure the length of the timing chain to judge if it can be reused.
 
HINT:
Replace the chain if the measured value exceeds the specified value.
Correct valve timing cannot be obtained if the timing chain elongates too much.
Refer to the Repair Manual for the specified value.

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