Camshaft Inspection
NOTE:- Do not rotate the camshaft during inspection.
- Remove the rocker arms and rocker shafts.
1. Put the camshaft and the camshaft holders on the cylinder head, then tighten the bolts to the specified torque.
Specified torque:
8 mm bolts: 20 Nm (2.0 kgs.cm 14 ft.lbs.)
Apply engine oil to the threads.
6 mm bolts: 12 Nm (1.2 kgs.cm 8.7 ft.lbs.)
Apply engine oil to the threads.
2. Seat the camshaft by pushing it toward the rear of the cylinder head.
3. Zero the dial indicator against the end of the camshaft. Push the camshaft back and forth, and read the end play.
Camshaft End Play:
Standard (New): 0.05 - 0.15 mm (0.002 - 0.006 inch)
Service Limit: 0.5 mm (0.02 inch)
4. Remove the bolts, then remove the camshaft holders from the cylinder head.
- Lift the camshaft out of the cylinder head, wipe it clean, then inspect the lip ramps. Replace the camshaft if any lobes are pitted, scored, or excessively worn.
- Clean the camshaft bearing surfaces in the cylinder head, then set the camshaft back in place.
- Place a plastigage strip across each journal.
5. Install the camshaft holders, and tighten the bolts to the specified torque.
6. Remove the camshaft holders, then measure the widest portion of the plastigage on each journal.
Camshaft-to-Holder Oil Clearance:
Standard (New): 0.050 - 0.089 mm (0.002 - 0.004 inch)
Service Limit: 0.15 mm (0.006 inch)
7. If the camshaft-to-holder oil clearance is out of tolerance:
- And the camshaft has already been replaced, you must replace the cylinder head.
- If the camshaft has not been replaced, first check the total runout with the camshaft supported on V-blocks.
Camshaft Total Runout:
Standard (New): 0.03 mm (0.001 inch) max.
Service Limit: 0.04 mm (0.002 inch)
- If the total runout of the camshaft is within tolerance, replace the cylinder head.
- If the total runout is out of tolerance, replace the camshaft and recheck the camshaft-to-holder oil clearance. If the oil clearance is still out of tolerance, replace the cylinder head.
8. Check the cam lobe height wear.
Cam lobe height standard (New)