Camshaft: Testing and Inspection
Inspection1. Set front and rear camshaft bearing journals on V blocks.
2. Position a dial indicator on center bearing journal and zero dial.
3. Rotate camshaft in V-blocks and check runout.
Runout: 0.0012 inch (0.03 mm) maximum
4. Check camshaft for uneven wear patterns, cracks, or damage.
5. Measure cam lobe heights at two points as shown.
Lobe height
Intake: Standard: 1.6848 inch (42.87 mm)
Exhaust: minimum: 1.6877 inch (42.868 mm)
6. Check camshaft bearing journal diameter (X and Y directions) on both sides (A and B) of journal as shown in figure.
Standard diameter: 1.324 - 1.326 inch (33.961 - 34.0 mm)
Minimum diameter: 1.0594 inch (26.910 mm)
Out-of-round: 0.0012 inch (0.03 mm) maximum
7. Replace camshafts if necessary.
8. Measure camshaft journal oil clearance with HLA's removed.
9. Remove all foreign material and oil from journals and bearing surfaces.
10. Set camshafts onto cylinder head.
11. Position Plastigage on journals in axial direction.
12. Do not rotate camshafts.
13. Install cam carrier assembly.
14. Install cam carrier bolts.
Tightening torque: 8.31 - 10.5 ft. lbs. (11.2 - 14.2 Nm, 1.15 - 1.45 kg-m)
15. Loosen cam carrier assembly bolts.
16. Remove cam carrier assembly.
17. Measure oil clearances.
Oil clearance: 0.0014 - 0.00031 inch (0.035 - 0.081 mm)
Maximum: 0.006 inch (0.15 mm)
18. If oil clearance exceeds specification, replace cylinder head.
19. Install camshafts.
20. Place a dial indicator against end of camshaft.
21. Using a prying tool, move camshaft as far forward as possible.
22. Zero dial.
23. Using prying tool, move camshaft as far rearward as possible.
24. Check gauge to determine how much end play is present.
End play: 0.0003 - 0.0004 inch (0.08 - 0.10 mm)
Maximum: 0.008 inch (0.20 mm)