ENGINE
Valves
(I)
Visually inspect the seating face and stem
of
each valve for wear and damage, and
repair
or
replace the valve,
as
necessary.
(2) A valve whose head
is
worn down to the
limit
of
"T"
value must be replaced.
(3) Inspect the valve for localized wear at three
places in particular, which are indicated in
the illustration, and repair
or
replace the
valve,
as
necessary. Make sure tha t the
top
end face and
other
surfaces
of
the
stem
as
shown by arrows are
smooth
and
that
there are no dents
nor
groovy depressions
on the stem.
I
nspect
here.
Check
here.
Valve wear
Valve springs
(I)
Cracked, worn
or
otherwise damaged springs
must be replaced.
(2) A weakened valve spring, the weakness
being evidenced by its reduced free length
or
spring rate, must be replaced.
(3) Check each spring for squareness. Never
re-use distorted valve springs.
Rocker arms and rocker shaft
(1) Take diameter measurement on rocker arms
and rocker shaft
to
determine the clearance
between the two. Replace the arms
if
the
clearance exceeds the service limit.
2-18
(2) A rocker arm whose end face for pushing
down the valve stem
is
badly worn must be
replaced. The same consideration
is
required
for the adjusting screw, whose end face
comes
into
contact with the
top
of
the
pushrod:
if
this face
is
found badly worn,
replace the adjusting screw.
Cylinder block
(I)
Visually inspect the cylinder block before
and after washing
it
clean.
If
any crack
or
serious damage
is
noted, replace the cylin-
der block.
(2) Check the camshaft front journal bushing
for wear.
If
the bushing
is
worn beyond the
service limit
or
damaged beyond repair,
remove
it
by using the special tool (installer)
and replace it with new one.
Front
face
of
cylinder block
Removing camshaft bushing
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