Westerbeke 5.0KW BCG-60Hz Service Manual page 36

CRANKSHAFT, BEARING AND OIL SEAL
R • 0.059 IN {1.5MM]
R .
0.059 IN {1.5MM]
MEASURE THE CRANKSHAFT OIL CLEARANCE
The crankshaft oil measured by using a plastic gauge
as follows:
1. The oil and grease and other foreign matters form the
crankshaft joumal and bearing inner surface.
2. Install the crankshaft.
3. Cut the plastic gauge to the same length as the width of
the bearing and place it on the journal in parrallel with its
axis.
4. Gently place the main bearing cap over it and tighten the
bolts to the specified torque.
S. Remove the bolts and gently remove the main bearing
cap. Measure the width of the smashed plastic gauge
(at its widest section) by using the scale printed on the
plastic gauge.
MAIN BEARING BOLT
TORDUE 36 - 40 FT-LBS
[50-56Nm]
~
PlASTlGAUGE'
SCALE
INSPECTING THE CRANKSHAFT REAR OIL SEAL
1. Inspect the oil clearance lip for wear or damage. Check
the rubber portion for deterioration and hardening.
Replace the seal if at all suspect.
2. Check the oil case for cracks and damage. If here is
damage, replace the case.
CRANKSHAFT BEARINGS SPECIFICATIONS
Upper and Lower
When the bearings are to be replaced, select the correct ones
and install them in positions according to the identification
marks stamped on the crankshaft and the top surface of the
cylinder block.
CRANKSHAFT JOURNAL DIAMETER
Identification Marks
1
2
3
Journal Diameter
1.5746 -1.5748 in (39.994 - 40.000mm)
1.5743 -1.5746 In (39.988 - 39.994mm)
1.5741-1.5743 in (39.982 - 39.988mm)
CAMSHAFT JOURNAL
CRANKSHAFT BEARING THICKNESS
Identification Colors
brown·
blue
yellow
green
o
Bearing Thickness
0.0783·0.0784 in (1.988 -1.991mm)
0.0784 - 0.0785 In (1.991 - 1.994mm)
0.0785 - 0.0786 in (1.994 - 1.997mm)
0.0786 - 0.0787 in (1.997 - 2.000mm)
0.0787 - 0.0789 in (2.000 - 2.003mm)
o
"'~N"I""'"
CYLINDER BLOCK
dodd
zzzz
CYLINDER BLOCK BEARING DIAMETER
Identification Marks
o
I
n:
Bearing Inner Diameter
'1.7323 -1.7325 in (44.000 - 44.o06mml
1.7325 -1.7328 in (44.006 - 44.012mm
1.7328 -1.7330 in (44.012 - 44.018mm
BEARING
IDENTIFICATION
MARKS
CRANKSHAFT BEARING SELECTION CHART
Crankshaft Journal Crankshaft Bearing Cylinder Block Bearing
Identification Marks Identification Marks Identification Marks
1 brown
0
I
blue
]I
2 0
blue I
yellow
]I
3 blue 0
yellow I
green ]I
Engines & Generators
29