ENGINE
COMPONENTS
INSPECTION
AND
SERVICING
CYLINDER HEAD
Remove
the
carbon and clean
the
cylinder head.
Check for scratches on
the
mating surface.
Check
the
gasketed surface
of
the
cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading
at
several places indicated.
If
the
largest reading
at
any
position
of
the
straightedge exceeds
the
limit, replace
the
cy
Ii
nder head.
09900-20803: Thickness gauge
Service Limit: 0.1 mm
If
the
largest reading
at
any portion of
the
straightedge exceeds
the
limit, rework
the
surface
by
rubbing it against emery paper
(of
about
# 400) laid flat on
the
surface plate
in
a lapping
manner.
The
gasketed surface must be smooth and perfectly flat
in
order
to
secure a tight joint. A leaky joint can be
the
cause of
reduced power
output
and increased fuel consumption.
CYLINDER
AND
EXHAUST
VALVE
Move
the
exhaust valve by hand and check
that
the exhaust
valve slides smoothly.
Remove
the
exhaust valves from
the
respective cylinders.
Decarbon
the
exhaust port, exhaust valves and the upper part
of
the
cylinder, taking care
not
to
damage
the
cylinder wall
surface.
Inspect
the
exhaust valve and cylinder sliding surface for nicks,
scratches, wear or
other
damage.
ENGINE
3-30
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