A62192
Hold Pressure
Decompress
Advanced
Side Path
Retard
Side Path
A62190
Advance
Side Path
Retard Side
Path
Open
Close
RubberVinyl Tape
Open
Close
–ENGINE MECHANICAL CAMSHAFT
14–101
2004 COROLLA (RM1037U)
(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.
HINT:
The lock pin is released, and camshaft timing gear, revolves in
the advance direction.
(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.
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) 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.
CAUTION:
Be sure to perform this check by hand, instead of air pres-
sure.
(d) Check the lock in the most retarded position.
(1) Confirm that the camshaft timing gear assembly is
locked at the most retarded position.
14. REMOVE CAMSHAFT TIMING GEAR ASSY
(a) Grip the camshaft with a vice, and confirm that it the gear
locked.
CAUTION:
Be careful not to damage the camshaft.
(b) Cover 4 oil paths of cam journal with vinyl tape as shown
in the illustration.
HINT:
Two advance side paths are provided in the groove of the cam-
shaft. Plug one of the path with a rubber piece.
(c) Break through the tapes of the advance side path and the
retard side path on the opposite side of the groove.
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