Camshaft, Engine

INSPECTION AFTER REMOVAL
Camshaft Runout





1. Put V-block on precise flat table, and support No. 2 and 4 journal of camshaft.

CAUTION: Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter from the other three locations.

2. Set dial indicator vertically to No. 3 journal.
3. Turn camshaft to one direction with hands, and measure the camshaft runout on dial indicator. (Total indicator reading)
Standard: Less than 0.02 mm (0.0008 inch)
Limit: 0.05 mm (0.0020 inch)
4. If it exceeds the limit, replace camshaft.

Camshaft Cam Height





1. Measure the camshaft cam height with micrometer.
Standard:
Intake: 45.465 - 45.655 mm (1.7900 - 1.7974 inch)
Exhaust: 45.075 - 45.265 mm (1.7746 - 1.7821 inch)
Limit:
Intake: 45.265 mm (1.7821 inch)
Exhaust: 44.875 mm (1.7667 inch)
2. If wear exceeds the limit, replace camshaft.

Camshaft Journal Oil Clearance
CAMSHAFT JOURNAL DIAMETER





^ Measure the outer diameter of camshaft journal with micrometer.
Standard:
No. 1: 25.935 - 25.955 mm (1.0211 - 1.0218 inch)
No. 2, 3, 4: 23.445 - 23.465 mm (0.9230 - 0.9238 inch)

CAMSHAFT BRACKET INNER DIAMETER
^ Tighten camshaft bracket bolt with the specified torque.





^ Measure the inner diameter "A" of camshaft bracket with bore gauge.
Standard:
No. 1: 26.000 - 26.021 mm (1.0236 - 1.0244 inch)
No. 2, 3, 4: 23.500 - 23.521 mm (0.9252 - 0.9260 inch)

CAMSHAFT JOURNAL OIL CLEARANCE
^ (Oil clearance) = (Camshaft bracket inner diameter) - (Camshaft journal diameter).
Standard:
No. 1: 0.045 - 0.086 mm (0.0018 - 0.0034 inch)
No. 2, 3, 4: 0.035 - 0.076 mm (0.0014 - 0.0030 inch)
Limit: 0.15 mm (0.0059 inch)
^ If the calculated value exceeds the limit, replace either or both camshaft and cylinder head.

NOTE: Camshaft bracket cannot be replaced as a single part, because it is machined together with cylinder head. Replace whole cylinder head assembly.

Camshaft End Play





^ Install dial indicator in thrust direction on front end of camshaft. Measure the end play of dial indicator when camshaft is moved forward/backward (in direction to axis).
Standard: 0.115 - 0.188 mm (0.0045 - 0.0074 inch)
Limit: 0.24 mm (0.0094 inch)





^ Measure the following parts if out of the limit.
- Dimension "A" for camshaft No. 1 journal
Standard: 27.500 - 27.548 mm (1.0827 - 1.0846 inch)
- Dimension "B" for cylinder head No. 1 journal bearing
Standard: 27.360 - 27.385 mm (1.0772 - 1.0781 inch)
^ Refer to the standards above, and then replace camshaft and/or cylinder head.

Camshaft Sprocket Runout
1. Put V-block on precise flat table, and support No. 2 and 4 journal of camshaft.

CAUTION: Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter from the other three locations.





2. Measure the camshaft sprocket runout with dial indicator. (Total indicator reading)
Limit: 0.15 mm (0.0059 inch)
^ If it exceeds the limit, replace camshaft sprocket.

Valve Lifter





Check if surface of valve lifter has any wear or cracks.
^ If anything above is found, replace valve lifter.

Valve Lifter Clearance
VALVE LIFTER OUTER DIAMETER





^ Measure the outer diameter at 1/2 height of valve lifter with micrometer since valve lifter is in barrel shape.
Standard (Intake and exhaust): 33.977 - 33.987 mm (1.3377 - 1.3381 inch)

VALVE LIFTER HOLE DIAMETER





^ Measure the inner diameter of valve lifter hole of cylinder head with inside micrometer.
Standard (Intake and exhaust): 34.000 - 34.016 mm (1.3386 - 1.3392 inch)

VALVE LIFTER CLEARANCE
^ (Valve lifter clearance) = (Valve lifter hole diameter) - (Valve lifter outer diameter).
Standard (Intake and exhaust): 0.013 - 0.039 mm (0.0005 - 0.0015 inch)
^ If the calculated value is out of the standard, referring to each standard of valve lifter outer diameter and valve lifter hole diameter, replace either or both valve lifter and cylinder head.

CAMSHAFT AND CAMSHAFT BEARING:

CAMSHAFT AND CAMSHAFT BEARING