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ENGINE MECHANICAL - TIMING CHAIN
1. INSPECT TIMING CHAIN AND TIMING SPROCKETS
(a) 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.
Make the same measurements pulling at 3 or more places se-
lected at random.
(b) Wrap the chain around the timing sprocket.
(c) Using a vernier calipers, measure the timing sprocket di-
ameter with the chain.
Vernier calipers must contact the chain rollers for measur-
Minimum sprocket diameter (w/ Chain):
Camshaft 96.2 mm (3.787 in.)
EM2378 Crankshaft 50.5 mm (1.988 in.)
If the diameter is less than minimum, replace the chain and
2. INSPECT CHAIN TENSIONER SLIPPER AND
Measure the chain tensioner slipper and vibration damper
Maximum wear: 1.0 mm (0.039 in.)
If the wear is greater than maximum, replace the slipper and/or
3. INSPECT CHAIN TENSIONER
Raise (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
Move Lock (c) locked in place by the ratchet pawl and does not move
when pushed with your finger.
2002 ECHO (RM884U)
Author : Date : 632
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