Camshaft, Engine
INSPECTION AFTER REMOVALCheck camshaft for scratches, seizure and wear.
Camshaft Runout
1. Put the camshaft on a V-block supporting the No.2 and No.5 journals.
2. Set the dial gauge vertically on the No.3 journal.
3. Turn camshaft in one direction by hand, and measure the camshaft runout on the dial gauge total indicator reading.
Standard: Less than 0.02 mm (0.0008 inch)
Limit: 0.1 mm (0.004 inch)
4. If it exceeds the limit, replace camshaft.
Camshaft Cam Height
1. Measure the camshaft cam height.
Standard intake cam height: 40.61 - 40.8 mm (1.599 - 1.606 inch)
Standard exhaust cam height: 38.965 - 39.155 mm (1.534 - 1.542 inch)
Cam wear limit: 0.20 mm (0.0079 inch)
2. If wear is beyond the limit, replace the camshaft.
Camshaft Journal Clearance
1. Install the camshaft brackets and tighten the bolts to specified torque.
2. Using inside micrometer, measure inner diameter of camshaft bracket.
Standard No. 1
Intake and exhaust: 28.000 - 28.021 mm (1.1024 - 1.1032 inch)
Standard No.2, 3, 4, 5
Intake: 23.985 - 24.006 mm (0.9443 - 0.9451 inch)
Exhaust: 24.000 - 24.021 mm (0.9449 - 0.9457 inch)
3. Measure the outer diameter of the camshaft journal.
Standard No.1: 27.935 - 27.955 mm (1.0998 - 1.1006 inch)
Standard No. 2, 3, 4, 5: 23.935 - 23.955 mm (0.9423 - 0.9431 inch)
4. If the journal clearance exceeds the limit, replace camshaft and/or cylinder head.
^ (Camshaft journal clearance) = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal)
Camshaft journal clearance
Standard
Intake: 0.030 - 0.071 mm (0.0012 - 0.0028 inch)
Exhaust: 0.045 - 0.086 mm (0.0018 - 0.0034 inch)
Limit
Intake: 0.135 mm (0.0053 inch)
Exhaust: 0.150 mm (0.0059 inch)
NOTE: Inner diameter of the camshaft bracket is manufactured together with the cylinder head. If the camshaft bracket is out of specification, replace the entire cylinder head assembly.
Camshaft End Play
1. Install camshaft in cylinder head.
2. Install a dial gauge in the thrust direction on the front end of the camshaft. Measure the end play with the dial gauge while moving the camshaft forward and backward (in direction to axis).
Camshaft end play
Standard: 0.115 - 0.188 mm (0.0045 - 0.0074 inch)
Limit: 0.20 mm (0.0079 inch)
3. If out of the specified range, replace with new camshaft and measure again.
4. If out of the specified range again, replace with new cylinder head assembly.
Camshaft Sprocket Runout
1. Install the camshaft sprocket on the camshaft.
2. Measure camshaft sprocket runout while turning the camshaft by hand.
Runout (total indicator reading: Less than 0.15 mm (0.0059 inch)
3. If it exceeds the specification, replace camshaft sprocket.
Valve Lifter and Valve Shim
1. Check contact and sliding surfaces for excessive wear or cracks, replace as necessary.
2. Measure the valve lifter outer diameter.
Valve lifter outer diameter: 29.960 - 29.975 mm (1.1795 - 1.1801 inch)
If out of the specified range, replace the valve lifter.
3. Measure the valve lifter guide bore.
Valve lifter guide bore: 30.000 - 30.021 mm (1.1811 - 1.1819 inch)
4. Calculate valve lifter clearance. If out of specified range, replace valve lifter and/or cylinder head of whichever exceeds standard limit. (Valve lifter clearance) = (valve lifter guide bore) - (outer diameter of valve lifter)
Valve lifter clearance: 0.025 - 0.065 mm (0.0010 - 0.0026 inch)
Camshaft and Camshaft Bearing:
Camshaft and Camshaft Bearing