Camshaft, Engine

INSPECTION AFTER REMOVAL
Camshaft Runout





1. Put V block on precise flat work bench, and support No. 1 and No. 5 journals of camshaft.
2. Set dial gauge vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft runout on dial indicator (total indicator reading).
Camshaft runout: Less than 0.02 mm (0.0008 inch)
^ If measurement exceeds specification, replace the camshaft.

Camshaft Cam Height





^ Measure camshaft cam height.
Standard cam height (intake & exhaust): 44.465 - 44.655 mm (1.7506 - 1.7581 inch)
Cam wear limit (intake & exhaust): 0.02 mm (0.0008 inch)
^ If measurement is not within the specifications, replace the camshaft.

Camshaft Journal Clearance
Camshaft Journal Diameter





^ Measure diameter of camshaft journal.
Standard diameter: 25.953 - 25.970 mm (1.0218 - 1.0224 inch)

Camshaft Bracket Inner Diameter





^ Tighten the camshaft bracket bolt to the specified torque.
^ Measure the inner diameter of the camshaft bracket.
Standard: 26.000 - 26.021 mm (1.0236 - 1.0244 inch)

Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) - (camshaft journal diameter)
Standard: 0.030 - 0.068 mm (0.0012 - 0.0027 inch)
^ If measurement is not within specification, replace either or both camshaft and cylinder head.

NOTE: The inner diameter of the camshaft bracket is manufactured together with the cylinder head. Replace the whole cylinder head as an assembly.

Camshaft End Play





^ Install dial gauge in the thrust direction on the front end of the camshaft. Measure the end play when the camshaft is moved forward/backward (in direction to axis).
Standard: 0.115 - 0.188 mm (0.0045 - 0.0074 inch)
^ If measurement is out of the specified range, replace the camshaft and measure again.
^ If measurement is still out of the specified range, replace the cylinder head.





^ Measure the following parts if end play is outside the specified value.
- Dimension "A" for camshaft No.1 journal
Standard: 30.500 - 30.548 mm (1.2008 - 1.2027 inch)
- Dimension "B" for cylinder head No.1 journal
Standard: 30.360 - 30.385 mm (1.1953 - 1.1963 inch)
^ If measurements are not within specification, replace the camshaft and/or cylinder head.

Camshaft Sprocket Runout





1. Install camshaft in cylinder head.
2. Install camshaft sprocket to camshaft.
3. Measure camshaft sprocket runout.
Runout: Less than 0.15 mm (0.0059 inch)
^ If measurement exceeds the specification, replace the camshaft sprocket.

Valve Lifter





Check if surface of valve lifter has any wear or cracks.
^ If any damage is found, replace valve lifter.
^ Select the thickness of the head so that valve clearance is within the standard when replacing. Refer to "Valve Clearance"

Valve Lifter Clearance
Valve Lifter Diameter





^ Measure diameter of valve lifter.
Standard: 33.977 - 33.987 mm (1.3377 - 1.3381 inch)

Valve Lifter Hole Diameter





^ Measure the diameter of the valve lifter hole of the cylinder head, using suitable tool.
Standard: 34.000 - 34.016 mm (1.3386 - 1.3392 inch)

Calculation of Valve Lifter Clearance
(Valve lifter clearance) = (valve lifter hole diameter) - (valve lifter diameter)
Standard: 0.013 - 0.039 mm (0.0005 - 0.0015 inch)
^ If the measurement is not within specification, referring to each specification of the valve lifter diameter and hole diameter, replace either or both the valve lifter and cylinder head.





CAMSHAFT AND CAMSHAFT BEARING