Timing Components: Testing and Inspection

1. Inspect timing chains, timing gears and timing sprockets.





(a) Measure the length of 16 links with the chain fully stretched.
Maximum chain elongation:
No. 1 Timing chain: 147.5 mm (5.807 inch)
No. 2 Timing chain: 123.6 mm (4.866 inch)
If the elongation is greater than maximum, replace the chain.

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

(b) Wrap the chain around the timing gear and timing sprocket.





(c) Using vernier calipers, measure the timing gear and timing sprocket diameter with the chain.

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

Minimum gear diameter (w/ chain):
Camshaft: 113.8 mm (4.480 inch)
Crankshaft: 59.4 mm (2.339 inch)
Balance shaft: 75.9 mm (2.988 inch)
Minimum sprocket diameter (w/ chain):
No. 2 crankshaft: 96.7 mm (3.807 inch)
If the diameter is less than minimum, replace the chain, gears and sprocket.





2. Inspect chain tensioner slipper and vibration dampers.
Measure the chain tensioner slipper and vibration damper wears.
Maximum wear: 1.0 mm (0.039 inch)
If the wear is greater than maximum, replace the slipper and/or dampers.
3. Inspect No. 1 chain tensioner.
4. Inspect No. 2 chain tensioner.
A. 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.





B. Inspect oil jet (No. 2 chain tensioner).
Check the oil jet for damage or clogging.
If necessary, replace the oil jet (No. 2 chain tensioner).