Camshaft, Engine

INSPECTION AFTER REMOVAL
Camshaft Visual Check
Check camshaft for scratches, seizure and wear. Replace if necessary.

Camshaft Runout





1. Put V-block on precise flat bed and support No. 2 and No. 4 journal of camshaft as shown.
2. Set dial gauges vertically to No. 3 journal as shown.
3. Turn camshaft in one direction slowly by hand, measure the camshaft runout on the dial gauges.
^ Runout is the largest indicator reading after one full revolution.
Camshaft Runout
Standard: Less than 0.02 mm (0.0008 inch)
Limit: 0.05 mm (0.0020 inch)
4. If actual runout exceeds the limit, replace the camshaft.

Camshaft Cam Lobe Height





1. Measure camshaft cam lobe height as shown.
2. If wear has reduced the lobe height below specifications, replace the camshaft.

Camshaft Journal Clearance
Outer Diameter of Camshaft Journal





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

Inner Diameter of Camshaft Bracket





1. Tighten camshaft bracket bolt with specified torque.
2. Using inside micrometer, measure inner diameter A of camshaft bearing.
Standard inner diameter No.1: 26.000 - 26.021 mm (1.0236 - 1.0244 inch)
Standard inner diameter No.2, 3, 4: 23.500 - 23.521 mm (0.9252 - 0.9260 inch)

Calculation of Camshaft Journal Clearance
(Journal clearance) = (inner diameter of camshaft bracket) (outer diameter of camshaft journal)
Standard No.1: 0.045 - 0.086 mm (0.0018 - 0.0034 inch)
Standard No.2, 3, 4: 0.035 - 0.076 mm (0.0014 - 0.0030 inch)
Limit: 0.15 mm (0.0059 inch)
^ When out of the specified range, replace either or both camshaft and cylinder head.

NOTICE: Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylinder head assembly.

Camshaft End Play
1. Install the camshaft in the cylinder head.





2. Install dial gauge in thrust direction on front end of camshaft. Measure end play when camshaft is moved forward/backward (in direction to axis) as shown.
Standard: 0.115 - 0.188 mm (0.0045 - 0.0074 inch)
Limit: 0.24 mm (0.0094 inch)
^ If out of the specified range, replace with new camshaft and measure again.
^ If out of the specified range again, replace with new cylinder head.

Camshaft Sprocket Runout





1. Put V-block on precise flat bed and support No. 2 and No. 4 journal of camshaft as shown.
2. Install camshaft sprocket on camshaft.
3. Measure camshaft sprocket runout.
Runout: Less than 0.15 mm (0.0059 inch)
4. If sprocket runout exceeds the limit, replace camshaft sprocket.

Valve Lifter





^ Check if the surface of the valve lifter has any excessive wear or cracks, replace as necessary.

Valve Lifter Clearance
Outer Diameter of Valve Lifter





^ Measure the outer diameter of the valve lifter.
^ If out of the specified range, replace the valve lifter.

Valve Lifter Bore Diameter





^ Using inside micrometer, measure diameter of valve lifter bore of cylinder head.
^ If out of the specified range, replace the cylinder head assembly.

Calculation of Valve Lifter Clearance
^ (Valve lifter clearance) = (hole diameter for valve lifter) (outer diameter of valve lifter)
^ If out of specified range, replace either or both valve lifter and cylinder head assembly.

CAMSHAFT AND CAMSHAFT BEARING:

CAMSHAFT AND CAMSHAFT BEARING