Timing Chain: Testing and Inspection

1NZ-FXE ENGINE MECHANICAL: TIMING CHAIN: INSPECTION

INSPECTION

1. INSPECT CHAIN





(a) Using a spring scale, pull the timing chain with a force of 140 N (14.3 kgf, 31.5 lbf) and measure the length of it.
Maximum chain elongation:
124.2 mm (4.890 in.)
If the elongation is greater than the maximum, replace the chain.
HINT: Perform the measurements at 3 or more random places to obtain the average length.

2. INSPECT NO. 1 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.
3. INSPECT CHAIN TENSIONER SLIPPER





(a) Measure the chain tensioner slipper wear.
Maximum wear:
1.0 mm (0.039 in.)
If the wear is greater than the maximum, replace the slipper.
4. INSPECT NO. 1 CHAIN VIBRATION DAMPER





(a) Measure the vibration damper wear.
Maximum wear:
1.0 mm (0.039 in.)
If the wear is greater than the maximum, replace the damper.