Illus 15 Push Rod Cover Disassembled

ADJUSTING VALVE TAPPETS (SIDE VALVE ENGINE)

1. Tappet adjusting screw—with which adjustment is made, after slightly loosening nut (2).

2. Tappet adjusting screw lock nut.

3. Tappet Body.

4. Valve stem.

5. Valve spring upper cover.

6. Valve spring cover keeper.

nxus. 16

ADJUSTING VALVE TAPPETS (SIDE VALVE ENGINE)

1. Tappet adjusting screw—with which adjustment is made, after slightly loosening nut (2).

2. Tappet adjusting screw lock nut.

3. Tappet Body.

4. Valve stem.

5. Valve spring upper cover.

6. Valve spring cover keeper.

The intake valves are those nearest the carburetor.

Adjust tappets so that there is .004" to .005" clearance between intake valve steins and tappets, and 007" to .008" clearance between exhaust valve stems and tappets. An accurate thickness gauge should be used to measure these clearances. If no gauge is available, use one thickness of ordinary writing piper to gauge intake tappet clearance, and two thicknesses of the same paper to gauge exhaust tappet clearance.

Before replacing valve spring covers, inspect the cork washer between each lower cover and tappet guide. If broken or damaged, install a new washer to prevent an oil leak. Also, make sure spring covers are properly seated against cork washers. Otherwise, serious oil leakage will result.

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