3·33
ENGINE
PISTON RING FREE END GAP
As the piston ring wears, its end
gap
increases
reducing engine
power
output
because
of
the resultant
blowby
through the
enlarged gap. Here lies the importance
of
using piston rings
with
end
gaps
within
the
limit.
Measure the piston ring free end
gap
to
check the spring
tension.
Service
Limit
(Top & 2nd rings): 4.0
mm
(0.16 in)
PISTON RING TO GROOVE CLEARANCE
Fix
the piston ring in the piston ring groove, measure the ring
side clearance
with
the thickness
gauge
while matching
the
sliding surface
of
piston and ring.
Standard clearance
1st : 0.02 - 0.06 mm (0.0008 - 0.0024 in)
2nd:
0.02 - 0.06 mm (0.0008 - 0.0024 in)
NOTE:
1st
ring
and
2nd
ring
differ
in
the
shape.
Be
sure to bring the
"T"·marked side to top when fitting them to the piston.
BEARINGS
Wash
the bearing
with
cleaning solvent and lubricate
with
motor
oil
before inspecting.
Turn
the inner
race
and check
to
see
that
the inner
race
turns
smoothly.
If
it
does
not
turn
lightly,
quietly
and smoothly,
or
if
noise
is
heard, the bearing
is
defective and must
be
replaced
with
a
new one.
OIL
SEALS
Damage
to
the lip
CD
of
the oil
seal
may result in
leakage
of
the fuel-air
mixture
or
oil. Inspect
for
damage
and
be
sure
to
replace damaged
oil
seals
with
new ones.
Top
ring
2nd ring
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