Camshaft: Testing and Inspection

2AZ-FXE ENGINE MECHANICAL: CAMSHAFT: INSPECTION

INSPECTION

1. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

(a) Check the lock of the camshaft timing gear.
(1) Clamp the camshaft in a vise, and confirm that the camshaft timing gear is locked.
NOTICE: Be careful not to damage the camshaft.

(b) Release the lock pin.
(1) Cover the 4 oil paths of the cam journal with electrical tape as shown in the illustration.
HINT: The 2 advance side paths are provided in the groove of the camshaft. Plug one of the paths with a rubber piece.
(2) Prick a hole in the tape placed on the advance side, prick a hole in the tape placed on the retard side path, on the opposite side to that of the advance side path, as shown in the illustration.

(3) Apply approximately 200 kPa (2.0 kgf/cm2, 28 psi) of air pressure to the two broken paths.
CAUTION: Cover the paths with a piece of cloth when applying pressure to keep oil from splashing.
(4) Check that the camshaft timing gear revolves in the advance direction when reducing the air pressure of the retard side path.
OK:
Gear rotates in the advance direction.
HINT: This operation releases the lock pin for the most retarded position.
(5) When the camshaft timing gear reaches the most advanced position, remove the air gun from the retard side path and advance side path, in that order.
NOTICE: Do not remove the air gun from the advance side path first. The gear may abruptly shift in the retard direction and break the lock pin.

(c) Check for smooth rotation.
(1) Rotate the camshaft timing gear within its movable range several times, but do not turn it to the most retarded position. Check that the gear rotates smoothly.
OK:
Gear rotates smoothly.
NOTICE: Do not use an air gun to check for smooth operation.

(d) Check the lock in the most retarded position.
(1) Confirm that the camshaft timing gear is locked at the most retarded position.
2. INSPECT CAMSHAFT

(a) Inspect the camshaft for runout.
(1) Place the camshaft on V-blocks.
(2) Using a dial indicator, measure the circle runout at the center journal.
Maximum circle runout:
0.03 mm (0.0012 in.)
If the circle runout is greater than the maximum, replace the camshaft.

(b) Inspect the cam lobes.
(1) Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
44.516 to 44.616 mm (1.7526 to 1.7565 in.)
Minimum cam lobe height:
44.406 mm (1.7483 in.)
If the cam lobe height is less than the minimum, replace the camshaft.

If the journal diameter is not as specified, check the oil clearance.
3. INSPECT NO. 2 CAMSHAFT

(b) Inspect the cam lobes.
(1) Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
45.983 to 46.083 mm (1.8104 to 1.8143 in.)
Minimum cam lobe height:
45.873 mm (1.8060 in.)
If the cam lobe height is less than the minimum, replace the No. 2 camshaft.

If the journal diameter is not as specified, check the oil clearance.