Most engines utilize an oil pump drive gear incorporated on the camshaft.
REMOVAL & INSTALLATION
To facilitate the installation, make sure that No. 1 piston is at Top Dead Center before removing the camshaft.
- Follow the Cylinder Head, Removal & Installation procedures before attempting to remove the camshaft.
- Loosen the camshaft and rocker arm shaft holder bolts in a criss-cross pattern, beginning on the outside holder.
- Remove the rocker arms, shafts and holders as an assembly.
- Lift out the camshaft and right head seal.
- Using a putty knife, clean the gasket mounting surfaces.
- To install, reverse the removal procedures, being sure to install and tighten (in steps) the holder bolts in the reverse order of removal.
Back off valve adjusting screws before installing rockers, then, adjust valves as outlined in Engine Performance and Tune-up
Degrease the camshaft using safe solvent, clean all oil grooves. Visually inspect the cam lobes and bearing journals for excessive wear. If a lobe is questionable, check all lobes and journals with a micrometer.
Measure the lobes from nose to base and again at 90°. The lift is determined by subtracting the second measurement from the first. If all exhaust lobes and all intake lobes are not identical, the camshaft must be reground or replaced. Measure the bearing journals and compare to specifications. If a journal is worn there is a good chance that the cam bearings are worn too, requiring replacement.
If the lobes and journals appear intact, place the front and rear cam journals in V-blocks and rest a dial indicator on the center journal. Rotate the camshaft to check for straightness, if deviation exceeds 0.025mm, replace the camshaft.