31. Camshafts Clean and Inspect

^ Tool(s) Required
- J 26900-2 Outside Micrometer
- J 8001 Dial Indicator Set
- J 26900- 13 Magnetic Base





1. Measure the camshaft lobe height using the J 26900-2. Replace the camshaft if any lobe is below the minimum.
Standard Intake Camshaft Lobe Height: 40.402-40.562 mm (1.5906-1.5969 inch)
Minimum Intake Camshaft Lobe Height: 40.202 mm (1.5827 inch)
Standard Exhaust Camshaft Lobe Height: 39.921-40.081 mm (1.5717-1.5780 inch)
Minimum Exhaust Camshaft Lobe Height 39.721 mm (1.5638 inch)





2. Place the camshaft onto V-blocks. Measure the camshaft runout using the J 8001 with the J 26900-13. Replace the camshaft if the runout exceeds specifications.
Camshaft Runout: 0.10 mm (0.0039 inch)





3. Inspect the camshaft bearing caps (1) for wear, cracks and scoring.
4. Inspect the camshaft bearing journals in the cylinder head for wear, cracks and scoring.
5. If excessive wear or scoring is present, or if the cylinder head is cracked, replace the cylinder head (with bearing caps).
6. Clean the journals of the camshaft and the cylinder head.
7. Do not install the valve lifters.
8. Install the camshafts. The rear end of the exhaust camshaft is slotted to mate with the camshaft position sensor.

Important: Do not turn the camshafts while the gauging plastic is installed.

9. Place a piece of gauging plastic across the full width of each camshaft journal.





Important: Cylinder head and camshaft damage may result if the bearing caps are incorrectly installed. The oil clearance measurement will also be incorrect.

10. Install the camshaft bearing caps. The caps are marked intake or exhaust (1), position away from the timing chain (2), and direction toward the timing chain (3).





Notice: Refer to Fastener Notice in Service Precautions.

11. Use 3 progressive steps to tighten the camshaft bearing cap bolts in sequence.
Tighten the bolts to 11 Nm (8 ft. lbs.).
12. Remove the camshaft bearing caps.





13. Measure the gauging plastic (1) at its widest point.
Standard Oil Clearance: 0.020-0.074 mm (0.0008-0.0029 inch)
Maximum Oil Clearance: 0.12 mm (0.0047 inch)
14. If the clearance is greater than the maximum perform the following:
14.1. Remove the camshaft.
14.2. Measure the camshaft journal outside diameter with the J 26900-2.
Intake and Exhaust Camshaft Journal OD: 25.959-25.980 (1.0220-1.0228 inch)
14.3. Install the camshaft bearing caps and torque to 11 Nm (97 inch lbs.).
14.4. Measure the camshaft journal inside (bore) diameter.
Intake and Exhaust Camshaft Bore ID: 26.000-26.033 (1.0236-1.0249 inch)
15. Replace the component (camshaft or cylinder head with caps) that has the greatest difference from specification.