Tappet Clearance - Suzuki DF 40 Service Manual

TAPPET CLEARANCE

Inspect initially after 20 hours (1 month) and every 200
hours (12 months) thereafter
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 engine
will run without excessive noise from the valve mechanism and
will deliver full power. In this engine, the tappet clearance 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 must be checked and adjusted:
• at the time of periodic inspection
• when the valve mechanism is serviced
• when the camshafts are disturbed by removing them for in-
spection
CHECKING AND ADJUSTING TAPPET CLEARANCE
(1) Remove following parts :
• Engine side lower cover (see page 7-1)
• Flywheel cover
• Ignition coils
• Spark plugs
(2) Disconnect camshaft sensor lead
(3) Remove fuel hose (intake and outlet) .
pump.
(4) Remove the twelve bolts securing the cylinder head cover
to the cylinder head and remove cylinder head cover.
.
from low fuel
PERIODIC MAINTENANCE 2-8
3
9
8
4
6
7
5
11 12
10
1
2