Timing Chain: Testing and Inspection

TIMING CHAIN:

TIMING CHAIN:

TIMING CHAIN
OFF-VEHICLE INSPECTION
1. INSPECT TIMING CHAIN AND TIMING SPROCKETS





a. Using vernier calipers, measure the length of the 16 links with the chain fully stretched.
Maximum chain elongation: 122.6 mm (4.827 inch)
If the elongation is greater than maximum, replace the chain.

HINT: Make the same pulling measurements at 3 or more places selected at random.




b. Wrap the chain around the timing sprocket.
c. Using vernier calipers, measure the timing sprocket diameter with the chain.

NOTICE: Vernier calipers must contact the chain rollers for measuring.

Minimum Sprocket Diameter (w/ Chain):

If the diameter is less than the minimum, replace the chain and sprockets.





2. INSPECT CHAIN TENSIONER SLIPPER AND VIBRATION DAMPER
Measure the chain tensioner slipper and vibration damper wears.
Maximum wear: 1.0 mm (0.039 inch)
If the wear is greater than the maximum, replace the slipper and/or damper.




3. INSPECT CHAIN TENSIONER
a. Check that the plunger moves smoothly when the ratchet pawl is raised with your finger.
b. Release the ratchet pawl and check that the plunger is locked in place by the ratchet pawl and does not move when pushed with your finger.

4. INSPECT DRIVE BELT TENSIONER
Check the oil leakage and crack.
If necessary, replace the drive belt tensioner.