Tappet Clearance - Suzuki DF 90 Service Manual

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.
PERIODIC MAINTENANCE
Loosening
order
2-9