SERVICING
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing
1.
Clean the crankshaft journal and crankshaft bearing.
2.
Put a strip of press gauge
on
the
center
of
the journal.
•
IMPORTANT
• Never insert the press gauge into the oil hole
of
the
journal.
3.
Install the
main
bearing case and tighten the screws to the
specified torque, and remove the cases again.
4.
Measure the amount
of
the flattening with the scale and get the
oil clearance.
5.
If the clearance exceeds the allowable limit, replace the
crankshaft bearing.
Crankshaft journal
0.0.
Factory
spec.
74.977
to
74.990
mm
2.9518 to 2.9524 in.
Factory
spec.
0.018
to 0.062 mm
Oil clearance
between
0.0007
to 0.0024 in.
crankshaft
journal
and
crankshaft
bearing
Allowable
limit
0.20 mm
0.0079
in.
(Reference)
• Undersize dimensions
of
crankshaft journal.
Undersize
O.2mm
OAmm
0.008 in.
0.016
in.
Dimension A
2.8
to
3.2
mm
radius
2.8
to
3.2
mm
radius
0.1102 to
0.1260in.
radius 0.1102
to
0.1260 in. radius
Dimension B
1 .0
to
1.5
mm
radius
1.0
to
1.5
mm
radius
0.0394 to 0.0591 in. radius 0.0394 to 0.0591 In. radius
Dimension C
74.777 to 74.790
mm
74.577
to
74.590
mm
2.9440
to
2.9445 in.
2.9361
to
2.9366 in.
(0.8-5)
The
crankpin must
be
fine-finished to higher than
vvvv
Replacing Crankshaft Sleeve
1.
Remove the used crankshaft sleeve
(1)
using a special-use
puller
set.
2.
Set the sleeve guide
(4)
to
the crankshaft.
3.
Heat a new sleeve to a temperature between 150 to
200°C
(302 to 392
OF),
and fix the sleeve to·the crankshaft
as
shown.
4.
Press fit the sleeve using the auxiliary socket for pushing .
•
NOTE
• Mount the sleeve with its largely chamfered surface
facing outward.
....
WESTERBEKE
Engines & Genera/ors
52
B
CRANKSHAFT
o
A
A
c
A
CRANKSHAFT
JOURNAL
SLEEVE
CRANKCASE
GUIDE
SLEEVE
(1)
AUXILIARY
SOCKET
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