S.l
ENGINE
BODY
92.4mrn STROKE SERIES
WSM.01094
I
-
0087F055
1
Cylinder Head Flaw
Valve Recessing
1.
Clean the cylinder head, the valve face
and
seat.
2.
Insert the valve into guide.
3.
Measure the valve recessing or protrusion
with
a
depth gauge
or
dial gauge.
4.
If
the measurement exceeds the allowable limit,
replace the valve or cylinder head.
spec.
limit
Valve
recessing
(1) Cylinder Head Surface
1.
Prepare an air spray red check (Code
No:
07909-
31371).
2.
Clean the surface of the cylinder head
with
detergent.
3.
Spray the cylinder head surface
with
the red
permeative
I
i
qui d .
Leave
it
five
to
ten minutes after spraying.
4.
Wash away the red permeative
liquid
on the
cylinder head surface
with
the detergent.
5.
Spray the cylinder head surface
with
white
developer.
If
flawed,
it
can be identified as red
Valve stem
O.D.
Factory
8
015
to8,030 mm
Valve guide
I.D.
spec. 0.3156to0.3161 in.
marks.
ST1
OF042
7.950to7.975rnrn
Factory
spec. 0.3134to 0.3140 in.
Q
A109F025
:
(2)
Recessing
(3) Protrusion
Clearance between Valve Stem and auide
I.
Remove carbon from the valve guide section.
2.
Measure the valve stem
O.D.
with
an outside
micrometer.
3.
Measure the valve guide I.D.
of
the cylinder head
at the most wear part
as
shown
in
the figure
below
with
a small hole gauge. And calculate
the
clearance.
4.
If
the clearance exceeds the allowable limit,
replace the valves.
If
it
still
exceeds the allowable
limit, replace the valve guide.
1
Factory 0.040 to 0.070 mm
0.0016to0.0028 in.
Clearance between
valvesem
and
guide
I
I
limit
I
0.0039in.
I
s-75
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