Cylinder
Cylinder Wear
SERVICING
1.
Measure the
1.0.
of
the
cylinder at the
six
positions
with a
cylinder gauge
to
find the maximum
and
minimum I.O.'s.
2.
Get the difference (Maximum wear) between the maximum
and the minimum
l.o.'s.
3.
If the wear exceeds the allowable limit, bore and
hone
to
the
oversize dimension. (Refer to
"Correcting
Cylinder".)
4.
Visually check the cylinder wall for scratches.
If
deep
scratches are found,
the
cylinder should
be
bored. (Refer
to
"Correcting
Cylinder".)
Cylinder
Bor.
t.D.
(A) Top
(B) Middle
(C)
Bottom
(Skirt)
Factory
spec.
Allowable limit
98.000
10
98.022 mm
3.8582103.8591
in.
98.15 mm
3.8642
in.
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
Correcting Cylinder (Oversize + 0.5
mm)
1.
When the cylinder is worn beyond the allowable limit, bore and
hone it
to
the specified dimension.
Cylinder t.D. (2)
Factory
spec.
98.500
to
98.522 mm
3.8780
to
3.8788
in.
Maximum
wear
Allowable limit
98.65mm
3.88"9
in.
Horn
to
1.2
to
2.0
mm
.uR
max.
Finishing
V'lV'l
(0.000047
to
0.000079
in.
/JR max.)
2.
Replace the piston and piston rings with oversize (0.5
mm)ones.
.NOTE
• When the oversize
cylinder
is
worn
beyond
the
a"owable
limit,
replace
the
cylinder
block
with
a new one.
Oil Pump
Rotor Lobe Clearance
1.
Measure the clearance between lobes of the inner rotor
and
the outer rotor with a feeler gauge.
2.
If the clearance exceeds
the
allowable limit, replace
the
oil
pump rotor assernbly.
Factory
spec.
0.04
to
0.16 mm
Clearance
between
0.0016
to
0.0063
in.
inner rotor
and
outer
rotor
Allowable limit
0.3
mm
0.0118
in
.
...v:
WESTERBEKE
Engines & Generators
53
FEELER
GAUGE
A
B
C
MEASURING CYLINDER WEAR
,
,
,
,
,....
:CYLINoER
1.0.
,
,BEFORE
CONNECTiON:
, -
--
,
,
(1
)
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:
..
..
,
,
,
,
(2)
,
,
,
,
'CYLINDER
1.0.
,
,
,
,
OVERSIZE
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
'-'
,
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r--
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