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2-5 PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES
TAPPET CLEARANCE
Inspect Initial 1
000 km (600
miles)
and
Every 6 000 km (4 000 miles)
The
tappet clearance
specification is the same
for
both intake and exhaust valves. Too
small
a tappet
clearance may reduce the engine power; toe 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 ex-
cessive noise from
the valve mechanism 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 adjust-
ment must be checked and adjusted 1) a t the time
of periodic inspection, 2) when the valve mecha-
nism is serviced, and
3) when
the camshafts are
disturbed
by
removing them for servicing.
CHECKING THE TAPPET CLEARANCE
0.03
- 0.08 m m
cation (for both intake
NOTE:
*
The
cam
must be
at position
@
or @ to
check the tappet clearance or
to
remove
the shim disc. Clearance readings should
not be taken
with the cam
in any other
position
than
these
two
positions.
*
The clearance
specification
is for COLD
state.
Check
it
when engine is cold.
To turn
the
crankshaft for clearance check-
ing be sure to use
a
19 mm wrench and to
rotate in the normal running direction. All
spark plugs should
be
removed.
1.
Turn crankshaft to bring the exhaust
cam
of
No.
1
cylinder t o this position.
In
this condition,
read the clearance a t the exhaust
tappets
of
Nos.
1 and 2 cylinders. 'Use special tool
@
an all
tappets.
I
I
09900 - 20803
@
a,
Thickness gauge
@
#/+
IN.
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