REMOVAL & INSTALLATION
The camshaft(s) rotate in journals with journal caps that have been machined into the cylinder head. No bearings are used between the camshaft and the cylinder head. If a camshaft journal in the cylinder head has been damaged, the cylinder head must be replaced and the cause of the journal failure should be determined before replacing the damaged components.
- Note the radio security code and station presets.
- Disconnect the negative battery cable.
- Label and disconnect the spark plug wires.
- Remove the valve cover, as outlined earlier in this section.
- Remove the timing belt, as outlined earlier in this section.
- Loosen the rocker arm locknuts and adjusting screws.
- Remove the camshaft bearing caps or camshaft holder plates and holders, then carefully remove the camshafts.
- Remove the rocker arms, noting their positions, and inspect for wear.
Use new O-rings, seals, and gaskets when installing the camshaft.
- Clean and inspect the camshaft bearing caps in the cylinder head.
- Lubricate the lobes and journals of the camshaft prior to installation. Install the camshaft and the bearing caps.
- Tighten the camshaft bearing caps to 86 inch lbs. (9.8 Nm), in sequence.
- Set the camshafts at Top Dead Center (TDC) for No. 1 piston, align the holes in the camshafts with the holes in the No. 1 camshaft holder and insert a 5mm pin punch into the holes.
- Install the keys into the keyways on the camshafts and install the pulleys, then tighten the retaining bolts to 27 ft. lbs. (37 Nm).
- Install the timing belt, as outlined in this section.
- Adjust the valve clearance, as outlined in Section 1.
- Install the valve cover and tighten the nuts to 86 inch lbs. (9.8 Nm).
- Connect the spark plug wires, as tagged during removal.
- Connect the negative battery cable.
- Enter the security code for the radio.
Using solvent, degrease the camshaft and clean out all of the oil holes. Visually inspect the cam lobes and bearing journals for excessive wear. If a lobe is questionable, check all of the lobes as indicated. If a journal or lobe is worn, the camshaft MUST BE or replaced.
If a journal is worn, there is a good chance that the bearings or journals are worn and need replacement.
If the lobes and journals appear intact, place the front and rear journals in V-blocks and rest a dial indicator on the center journal. Rotate the camshaft to check the straightness. If deviation exceeds 0.001 in. (0.0254mm), replace the camshaft.
Check the camshaft lobes with a micrometer, by measuring the lobes from the nose to the base and again at 90° (see illustration). The lobe lift is determined by subtracting the second measurement from the first. If all of the exhaust and intake lobes are not identical, the camshaft must be reground or replace.