Clean and Inspect Camshaft

- Tools Required
- SA9179NE Dial Indicator





1. Install camshaft and bearing caps: (Refer to "Cylinder Head Assembly".)
a. Oil camshaft journals and install camshaft. Install the bearing caps with arrows on caps pointed toward camshaft sprockets (front of cylinder head).

NOTICE: Bolt threads should be lightly oiled prior to installation. Holes must be clean and free from oil and debris.

b. Bolts must be pulled down uniformly.
Torque: 14 Nm (10 ft. lbs.)





c. Camshaft should rotate freely. If the camshaft binds, check for burrs in the cylinder head and caps Journals.
2. Measure the camshaft thrust (end play). Using a dial indicator SA9179NE (or equivalent), measure the thrust clearance while moving each camshaft back and forth. If clearance is greater than maximum, replace the cylinder head or camshaft.
Thrust Clearance:
Standard: 0.006 - 0.396 mm (0.0002 - 0.0156 inch)
Service Limit: 0.45 mm (0.018 inch) max.
3. Remove the camshafts from the cylinder head:
a. Remove the bearing caps.
b. Remove each camshaft.





4. Inspect camshaft bore for flatness. Using a precision straight edge and feeler gauge, measure the surfaces contacting the camshaft for warpage. If warpage is greater than maximum, replace the cylinder head.
Maximum Warpage:
Standard: 0.05 mm (0.0020 inch) max.
Service Limit: 0.075 mm (0.003 inch) max.





5. Inspect camshaft:
a. Place the camshaft ends in V-blocks and, using a dial indicator SA9179NE (or equivalent), measure the total runout at the center journal. If the runout is greater than maximum, replace the camshaft.
Circle Total Runout:
Standard: 0.080 mm (0.003 inch) max.
Service Limit: 0.120 mm (0.0047 inch) max.








b. Using a dial indicator, measure the cam lobe lift/rise. Place the camshaft in V-blocks located next to the lobe being measured. If the cam lobe lift/rise is less than minimum, replace the camshaft.
Cam Lobe Lift Rise:
Intake and Exhaust:
Standard: 5.183 - 5.263 mm (0.2042 - 0.2074 inch)
Service Limit: 5.133 mm (0.203 inch) min.





c. Using a micrometer, measure the journal diameter.
Journal Diameter:
Standard: 26.950 - 26.970 mm (1.0618 - 1.0626 inch)
Service Limit: 26.925 mm (1.0608 inch) min.





d. Install the camshaft bearing caps. Using an inside micrometer, measure the housing bore diameter.
Bore Diameter:
Standard: 27.000 - 27.026 mm (1.0638 - 1.0648 inch)
Service Limit: 27.05 mm (1.0658 inch) max.
c. Subtract the journal diameter measurement from the housing bore diameter measurement. If the clearance is greater than maximum, replace the camshaft and/or cylinder head.

IMPORTANT: Plastigage or equivalent can be used to measure bearing clearance.

Oil Clearance:
Standard: 0.030 - 0.076 mm (0.0012 - 0.0030 inch)
Service Limit: 0.125 mm (0.005 inch) max.