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Retard
Side Path
Decompress
Retard Side
Path
Close
Open
Vinyl Tape
2004 COROLLA (RM1037U)
ENGINE MECHANICAL
Advanced
Side Path
HINT:
The lock pin is released, and camshaft timing gear, revolves in
the advance direction.
Hold Pressure
A62192
CAUTION:
Camshaft timing assembly gear occasionally shifts to the
retard side abruptly, if the air compression of the advanced
side path is released before retard side path. It often
causes the breakage of the lock pin.
(c)
CAUTION:
Be sure to perform this check by hand, instead of air pres-
sure.
(d)
14.
(a)
CAUTION:
Be careful not to damage the camshaft.
Advance
(b)
Side Path
HINT:
Two advance side paths are provided in the groove of the cam-
shaft. Plug one of the path with a rubber piece.
(c)
Open
Close
Rubber
A62190
–
CAMSHAFT
(4)
Confirm if the camshaft timing gear assembly re-
volves in the timing advance direction when weak-
ening the air pressure of the timing retard path.
(5)
When the camshaft timing gear comes to the most
advanced position, take out the air pressure of the
timing retard side path, and then, take out that of
timing advance side path.
Check smooth revolution
(1)
Revolve the camshaft timing gear assembly within
the movable range except for the most retarded
position several times, and check the smooth revo-
lution.
Check the lock in the most retarded position.
(1)
Confirm that the camshaft timing gear assembly is
locked at the most retarded position.
REMOVE CAMSHAFT TIMING GEAR ASSY
Grip the camshaft with a vice, and confirm that it the gear
locked.
Cover 4 oil paths of cam journal with vinyl tape as shown
in the illustration.
Break through the tapes of the advance side path and the
retard side path on the opposite side of the groove.
14–101
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