Camshaft

Camshaft
1. 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: 1.6415 inch (41.6949 mm)
Exhaust: 1.6629 inch (42.2369 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: 1.0606 - 1.0616 inch (26.940 - 26.965 mm)
Minimum diameter: 1.0594 inch (26.910 mm)
Out-of-round: 0.002 inch (0.05 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 (R) on journals in axial direction.
12. Do not rotate camshafts.
13. Install camshaft caps according to cap number and arrow mark.





14. Install cap bolts. Tighten them in five or six steps in order shown.
Tightening torque: 100 - 125 inch lbs. (11.3 - 14.2 Nm, 1.15 - 1.45 kg-m)





15. Loosen camshaft cap bolts in five or six steps in order shown.
16. Remove camshaft caps.





17. Measure oil clearances.
Oil clearance: 0.0014 - 0.0031 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)