Camshaft: Service and Repair

CAM SHAFT





COMPONENTS (DOHC)

DISASSEMBLY
1. Disconnect the breather hose and the PCV hose.
2. Remove the coolant pump pulley and crankshaft pulley.
3. Remove the timing belt cover.
4. Loosen the timing bolt tensioner pulley and temporarily secure it.
5. Remove the timing belt from the camshaft sprocket.
6. Loosen the center cover bolts and then remove the center cover.
7. Remove the ignition cold assembly.
8. Loosen the cylinder head cover bolts and then remove it.





9. Remove the camshaft pulley.
10. Remove the cam carrier assembly and timing belt.
11. Remove the camshaft.
12. Remove the HLA.

INSPECTION
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, Exhaust
Standard: 1.6878 inch (42.870 mm)
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: 1.3370 - 1.3386 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 Plastigauge 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 - 0.0032 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: 0.0026 - 0.0054 inch (0.067 - 0.137 mm)
Maximum: 0.0058 inch (0.147 mm)

REASSEMBLY
1. Install the HLA





2. Check that "I" mark on intake camshaft pulley is aligned with mark on cylinder head cover and "E" mark on exhaust camshaft pulley is aligned with mark on cylinder head cover.





3. Install the camshaft after lubricating the journal of camshaft with engine oil.
4. Install the cam carrier assembly.





5. Tighten the cam carrier bolts to the specified torque in two or three steps.
Tightening torque: 8.31 - 10.5 ft. lbs. (11.2 - 14.2 Nm, 1.15 - 1.45 kg-m)





6. Using special tool, camshaft oil seal installer (09221-21000), press the camshaft oil seal. Be sure to apply engine oil to the external surface of the oil seal. Insert the oil seal along the camshaft front end install by driving the installer with a hammer until the oil seal is fully seated.