Timing Chain: Inspection

NOTE: Make the same measurements pulling at 3 or more places selected at random.
Fig 1: Measuring Timing Chain Length
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Using a Vernier calipers, measure the length of 16 links with the chain dully stretched.

   Maximum chain elongation: 123.2 mm (4.850 in.) 

   If the elongation is greater than maximum, replace the chain.

2. Wrap the chain around the timing sprocket.
NOTE: Vernier calipers must contact the chain rollers for measuring.
Fig 2: Measuring Timing Sprocket Diameter With Chain
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Using a vernier calipers, measure the timing sprocket diameter with the chain.

Minimum sprocket diameter (w/ Chain): 

Camshaft 96.2 mm (3.787 in.) 

Crankshaft 50.5 mm (1.988 in.) 

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

Measure the chain tensioner slipper and vibration damper wears.

Maximum wear: 1.0 mm (0.039 in.) 

If the wear is greater than maximum, replace the slipper and/or damper.

Fig 3: Measuring Chain Tensioner Slipper And Vibration Damper Wear

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check that the plunger moves smoothly when the ratchet pawl is raised with your finger.
   Fig 4: Releasing Timing Chain Tensioner Plunger

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Release the ratchet pawl and check that the plunger is
3. locked in place by the ratchet pawl and does not move when pushed with your finger.