Camshaft (for Bank 1)

1UR-FSE ENGINE MECHANICAL: CAMSHAFT (for Bank 1): INSPECTION

INSPECTION

1. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

(a) Using vernier calipers, measure the width of the camshaft timing gear assembly's eccentric shaft cutout.
Standard width:
5.9 to 6.2 mm (0.232 to 0.244 in.)
Maximum width:
6.7 mm (0.264 in.)
If the result is greater than the maximum value, replace the camshaft timing gear assembly.
(b) Rotate the keyway part of the camshaft timing gear assembly's eccentric shaft by hand.
Standard:
Rotates smoothly
If the result is not as specified, replace the camshaft timing gear assembly.
NOTICE:
- Do not drop the camshaft timing gear assembly. If dropped, replace it.
- Do not disassemble the camshaft timing gear assembly. If disassembled, replace it.

2. INSPECT CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY
(a) Install the camshaft bearing cap Installation.
HINT: Only install the exhaust camshaft.

(b) Install the camshaft housing Installation.
(c) Apply a light coat of engine oil on the camshaft and camshaft timing exhaust gear.
(d) Using the hexagonal portion of the camshaft, align and attach the knock pin of the camshaft with the pin hole of the camshaft timing exhaust gear assembly.

NOTICE:
- Do not forcefully push in the camshaft timing exhaust gear assembly. This may cause the camshaft knock pin tip to damage the installation surface of the camshaft timing exhaust gear assembly.
- Be sure not to remove the other 4 bolts. If removed, replace the camshaft timing exhaust gear assembly.

(e) Apply a light coat of engine oil on the threads and under the heads of the bolt.

(f) Using a wrench to hold the hexagonal portion of the camshaft, install the camshaft timing exhaust gear assembly with the bolt.
Torque: 100 Nm (1020 kgf-cm, 74 ft-lbf)
(g) Remove the camshaft bearing cap Removal.
(h) Check the lock of the camshaft timing gear.
(1) Make sure that the camshaft timing exhaust gear is locked.
(i) Release the lock pin.

(1) Cover the 4 oil paths of the cam journal with vinyl tape as shown in the illustration.
(2) Prick a hole in the tape placed on the advance side path. 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 2 broken paths (the advance side path and the retard side path).
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 retard direction when reducing the air pressure applied to the advance side path.
HINT: This operation releases the lock pin for the most retarded position.
(5) When the camshaft timing gear reaches the most retarded position, release the air pressure from the advance side path and retard side path, in that order.
NOTE:
Do not release the air pressure from the retard side path first. The gear may abruptly shift in the advance direction and break the lock pin.

(j) Check for smooth rotation.
(1) Turn the camshaft timing gear within its movable range (21°) 2 or 3 times, but do not turn it to the most advanced position. Make sure that the gear turns smoothly.
NOTE:
Do not use air pressure to perform the smooth rotation check.

(k) Check the lock in the most advanced position.
(1) Confirm that the camshaft timing gear is locked at the most advanced position.
(l) Install the camshaft bearing cap Installation.
HINT: Only install the exhaust camshaft.

(m) Install the camshaft housing Installation.

(n) Hold the hexagonal portion of the camshaft with a wrench and loosen the bolt.
(o) Remove the camshaft bearing cap Removal.

(p) Remove the flange bolt and camshaft timing exhaust gear.
NOTE:
Be sure not to remove the other 4 bolts.

3. INSPECT CAMSHAFT SUB-ASSEMBLY

(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:
0.04 mm (0.0016 in.)
If the circle runout is greater than the maximum, replace the camshaft.
HINT: Check the oil clearance after replacing the camshaft.

(b) Using a micrometer, measure the cam lobe height.
Standard cam lobe height:

Minimum cam lobe height:

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.
4. INSPECT CAMSHAFT OIL CLEARANCE
(a) Clean the bearing caps, camshaft housing and camshaft journals.
(b) Place the camshafts on the camshaft housing.

(c) Lay a strip of Plastigage across each of the camshaft journals.
(d) Install the bearing caps Installation.
NOTE:
Do not turn the camshaft.

(e) Install the camshaft housing Installation.
NOTE:
Do not turn the camshaft.

(f) Remove the bearing caps Removal.

(g) Measure the Plastigage at its widest point.
Standard oil clearance:

Maximum oil clearance:

If the oil clearance is greater than the maximum, replace the camshaft. If necessary, replace the camshaft housing.