PERIODIC MAINTENANCE 2-9
INSTALLATION
Installation is reverse order of removal.
" Spark plug: 28 N·m (2.8 kg-m, 20.0 lb-ft)
TAPPET CLEARANCE
The tappet clearance specification is different for 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.
Using the proper tools provides for easy removal and installation
of the shim disc.
Tappet clearance adjustment should be checked and adjusted:
• during scheduled 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 lower cover (See page 7-2.)
• Ring gear cover and air intake silencer case
• Ignition coils
• Spark plugs
• Collector assembly (See page 6-3, 6-5.)
2. Remove PORT and STBD cylinder head covers. (See page
6-8.)
Inspect initially after 20 hours (1 month) and every
200 hours (12 months).
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