Timing Chain: Service and Repair

Fig. 10 Valve Timing Marks:

1. Remove front cover as outlined previously.
2. Remove crankshaft oil slinger.
3. Crank engine until timing marks on sprockets are in alignment, Fig. 10.
4. Remove camshaft to sprocket bolts.
5. Remove camshaft sprocket and timing chain together. If sprocket does not come off easily, a light blow with a plastic hammer to the sprocket should dislodge it.
6. If crankshaft sprocket is to be replaced, remove it with a suitable gear puller.
7. Apply Molykote or equivalent to sprocket thrust surfaces.
8. Install crankshaft sprocket, aligning key and keyway, if removed.
9. Install chain on camshaft sprocket. Hold sprocket vertical with chain hanging below and shift around to align the timing marks on sprockets.
10. Align dowel in camshaft with dowel hole in sprocket and install sprocket on camshaft. Do not attempt to drive sprocket on camshaft as welch plug at rear of engine can be dislodged.
11. Draw sprocket onto camshaft, using the mounting bolts. Tighten to specifications.
12. Lubricate timing chain with engine oil and install front cover.