Camshaft identification
The camshafts can be identified by the engraved letter.
- "A" Front intake camshaft
- "B" Front exhaust camshaft
- "C" Rear intake camshaft
- "D" Rear exhaust camshaft
Cam wear
- Check the camshaft for wear or damage.
- Measure the cam height H with a micrometer.
Cam height H:
- Service Limit: (IN. & EX.): 40.580 mm (1.5976 in)
- 09900-20202: Micrometer (25 - 50 mm)
Camshaft journal wear
- Determine whether or not each journal is worn down to the limit by measuring the oil clearance with the camshaft installed in place.
- Use the plastigauge A to read the clearance at the widest portion, which is specified as follows:
Camshaft journal oil clearance:
- Service Limit: (IN. & EX.): 0.150 mm (0.0059 in)
- 09900-22301: Plastigauge
- 09900-22302: Plastigauge
Note: Install camshaft journal holder to their original positions.
Tighten the camshaft journal holder bolts evenly and diagonally to the specified torque. (3-104)
Camshaft journal holder bolt: 11 N·m (1.1 kgf·m, 8.0 lb·ft)
Note: Do not rotate the camshaft with the plastigauge in place.
- Remove the camshaft journal holders, and read the width of the compressed plastigauge with envelope scale.
- This measurement should be taken at the widest part.
- If the camshaft journal oil clearance measured exceeds the limit, measure the inside diameter of the camshaft journal holder and outside diameter of the camshaft journal.
- Replace the camshaft or the cylinder head depending upon which one exceeds the specification.
Camshaft journal holder I.D.:
Standard: (IN. & EX.):
- 24.012 - 24.025 mm (0.9454 - 0.9459 in)
- 09900-20602: Dial gauge (1/1000, 1 mm)
- 09900-22403: Small bore gauge (18 - 35 mm)
Camshaft journal O.D.:
Standard (IN. & EX.):
- 23.959 - 23.980 mm (0.9433 - 0.9441 in)
- 09900-20205: Micrometer (0 - 25 mm)
Camshaft runout
- Measure the runout using the dial gauge.
- Replace the camshaft if the runout exceeds the limit.
Camshaft runout:
- Service Limit (IN. & EX.): 0.10 mm (0.004 in)
- 09900-20607: Dial gauge (1/100 mm, 10 mm)
- 09900-20701: Magnetic stand
- 09900-21304: V-block set (100 mm)
Cam sprocket and automatic-decomp.
- Inspect the cam sprocket teeth for wear and damage.
- Inspect the automatic-decomp. for damage and smooth operation.
- If there are unusual, replace the camshaft assembly and cam chain as a set.
Caution: Do not attempt to disassemble the cam sprockets and automatic-decomp. assembly. They are unserviceable.