PERIODIC MAINTENANCE 2-9
TAPPET CLEARANCE
Inspect initially after 20 hours (1 month) and every 200
hours (12 months).
The tappet clearance specification is the same for both intake
and exhaust valves.
Too small a tappet clearance may reduce engine power, too
large a tappet clearance increases valve noise and hastens
valve and seat wear.
When the tappets are set to the specified clearance, the en-
gine will run without excessive noise from the valve mecha-
nism and will deliver full power. In this engine, the tappet clear-
ance is increased or decreased by replacing the shim disc,
made of a special wear resistant material, fitted to the top of
the tappet.
The shim discs are easy to remove and refit.
Tappet clearance adjustment should be checked and adjusted :
• at time of periodic inspection
• when valve mechanism is serviced
• when camshafts are disturbed by removing them for inspec-
tion
CHECKING AND ADJUSTING TAPPET CLEARANCE
1. Remove following parts :
• Engine side covers (see page 7-2)
• Flywheel cover
• Spark plugs
2. Remove breather hose 1 and evaporation hose 2 from
cylinder head cover.
3. Remove fuel hose 3 and 4 from low pressure fuel pump.
4. Remove fifteen (15) bolts securing cylinder head cover 5
to cylinder head and remove cylinder head cover.
Loosening
order
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