Westerbeke 5.0KW BCG-60Hz Service Manual page 32

FRONT CASE I COUNTERBALANCE SHAFT AND OIL PUMP
4. Using a special tool drive the counterbalance shaft front
bearing from the cylinder block.
EARING REMOVER TOOL
S.
Use the same tool and drive the counterbalance shaft rear
bearing from the cylinder block.
OIL PUMP ASSEMBLY· INSPECTION
Fit the oil pump gear into the cylinder block. then, using a
feeler gauge, check the clearance with the body at the points
indicated in the diagram below.
DRIVEN GEAR BODY CLEARANCE STANDARD
A. 0.0161 - O.0266ln (0.410 - O.675mm)
B. 0.0051- O.oo69ln (0.130 - 0.175mm)
DRIVE GEAR BODY CLEARANCE STANDARD
C. 0.0173 - 0.02761n (0.44 - 0.70mm)
D. 0.0059 - O.OTIln (o.150 - 0.195mm)
DRIVEN GEAR SIDE ClEARANCE .0024 - 0.00471n (0.06 - 0.12mm)
DRIVE GEAR SIDE CLEARANCE 0.0027 - 0.0051 In (0.07 - 0.13mm)
Using a straight edge, check the side clearance at the point
indicated in the illustration with a feeler gauge.
There should be no uneven wear on the contact surfaces of
the cylinder block or on the pump gear side of the pump
~--DRIVE
GEAR
FRONT CASE· INSPECTION
Check the front case for cracks or other damage also inspect
the oil holes. If the oil holes are clogged, use compressed air
or solvent to clean them out
CRANKSHAFT
FRONTOtL
SEAL
CRANKSHAFT FRONT OIL SEAL • INSPECTION
Check the oil seal for wear and damage. Inspect the oil seal
lip for hardening. If there any signs of wear, replace the seal.
COUNTERBALANCE SHAFT
COUNTERBALANCE SHAFT· INSPECTION
Inspect the oil holes for clogging and clean if necessary.
Inspect the shaft journal for
seizure.
damage and its contact
with the bearing. Check the counterbalance shaft oil
clearance. Replace the counterbalance shaft if it fails to meet
the standards.
COUNTERBALANCE SHAfT STANDARDS
Front Journal Diameter 0.7869 - 0.78741n (19.987 - 20.DOOmm)
Rear Journal Diameter 1.7317 -1.7322In (43.984 - 44.DDOmm)
Front Journal 011 Clearance 0.0014· 0.00271n (0.035 - 0.068mm)
Rear Journal 011 Clearance 0.0014 - 0.00281n (0.035 - 0.071mm)
Engines & Generators
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