Camshaft, Engine
INSPECTION AFTER REMOVALCamshaft Runout
1. Put V block on precise flat work bench, and support No. 1 and No. 5 journals of the camshaft.
2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft runout on the dial indicator (total indicator reading).
Standard: Less than 0.02 mm (0.0008 inches)
^ If measurement exceeds specification, replace the camshaft.
Camshaft Cam Height
^ Measure the camshaft cam height.
Standard cam height (intake & exhaust): 44.465 - 44.655 mm (1.7506 - 1.7581 inches)
Cam wear limit (intake & exhaust): 0.02 mm (0.0008 inches)
^ If measurement is not within the specifications, replace the camshaft.
Camshaft Journal Clearance
Camshaft Journal Diameter
^ Measure the diameter of the camshaft journal.
Standard diameter: 25.953 - 25.970 mm (1.0218 - 1.0224 inches)
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 inches)
Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) - (camshaft journal diameter)
Standard: 0.030 - 0.068 mm (0.0012 - 0.0027 inches)
^ 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 inches)
^ 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 inches)
- Dimension "B" for cylinder head No. 1 journal
Standard: 30.360 - 30.385 mm (1.1953 - 1.1963 inches)
^ If measurements are not within specification, replace the camshaft and/or cylinder head.
Camshaft Sprocket Runout
1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket to the camshaft.
3. Measure the camshaft sprocket runout.
Runout: Less than 0.15 mm (0.0059 inches)
^ If measurement exceeds the specification, replace the camshaft sprocket.
Valve Lifter
Check if the surface of the valve lifter has any wear or cracks.
^ If any damage is found, replace the valve lifter.
^ Select the thickness of the head so that the valve clearance is within the standard when replacing. Refer to "Valve Clearance".
Valve Lifter Clearance
Valve Lifter Diameter
^ Measure the diameter of the valve lifter.
Standard: 33.977 - 33.987 mm (1.3377 - 1.3381 inches)
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 inches)
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 inches)
^ 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