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 belt 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 coil assembly.
8. Loosen the cylinder head cover bolts and then remove it.





9. Remove the camshaft pulley.
10. Remove the cam carrier assembly.
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.
4. Check camshaft for uneven wear patterns, cracks, or damage.





5. Measure cam lobe heights at two points as shown.





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: 8.3 - 10.5 ft. lbs. (11.3 - 14.2 Nm, 1.15 - 1.45 kgf-cm)
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.

REASSEMBLY
1. Install the HLA.





2. Install the phase sensor target wheel to the intake camshaft.

NOTE: The knock pin of camshaft and the white paint mark of target wheel must be symmetrical each other centering around axis of camshaft when installing the target wheel.





3. Install the camshaft after lubricating the journal of camshaft with engine oil.





4. Apply liquid sealant on the cam carrier as shown illustration.
Sealant type: HYLOGRIP 3000
Bead width: 0.0787 inch (2 mm)

NOTE:
^ Clean the foreign material from mating surface before applying sealant.
^ Assembly procedure must be completed within 15 minutes after applying sealant.





5. Install the cam carrier assembly. Tighten the cam carrier bolts as shown illustration.
Tightening torque: 8.3 - 10.5 ft. lbs. (11.3 - 14.2 Nm, 1.15 - 1.45 kgf-cm)





6. Install 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 until the oil seal is fully seated.
7. Install the seal plate.





8. Install the camshaft pulley.





9. Check that "I" mark on intake camshaft pulley is aligned with mark on seal plate and "E" mark on exhaust camshaft pulley is aligned with mark on seal plate.
10. Install the cylinder head cover.
Tightening torque: 3.6 - 6.5 ft. lbs. (4.9 - 8.8 Nm, 0.5 - 0.9 kgf-cm)
11. Install the ignition coil.





12. Install the timing belt.
13. Tighten the timing belt tensioner pulley.
Tightening torque: 27.5 - 38.3 ft. lbs. (37.3 - 52.0 Nm, 3.8 - 5.3 kgf-cm)
14. Install the timing belt cover.