Lubrication System Service; Description; Disassembly; Oil Filter And Oil Pump - Westerbeke 38B FOUR Service Manual

LUBRICATION SYSTEM SER\(ICE
DESCRIPTION
The lubrication system uses a trochoid gear pump and a full
flow oil filter. The oil pump is driven through the Oldham's
coupling at the rear end of the fuel injection pump camshaft.
Oil from the oil pump flows into the cartridge type oil filter
via the relief valve. After being filtered by this filter, oil is
delivered to various engine parts through oil galleries in the
engine block.
OIL PUMP
DIP STICK __ .. _ " ..........
The cartridge type oil filter, in which the filter body is inte-
gral with the filter element, is easy to handle. Oil from the oil
pump is led into the filter element. When a pressure difference
between before and after the element exceeds 1 kglcm
2
due to
excessive clogging of the element, a bypass valve in the ele-
ment will open an oil passage bypassing the element. As a
result, oil flows to various engine parts without filtration.
Therefore it is important to replace the oil filter regularly. The
oil filter should be replaced after the initial 50 hours of opera-
tion and thereafter every 100 hours of operation.
The trochoid gear type oil pump is mounted on the back of
. the fuel injection pump on the right side of the cylinder block.
The oil pump houses a relief valve. If pump delivery oil pres-
sure exceeds 4 kglcm2, the relief valve will open to by-pass oil
into the oil pan, thus preventing further oil pressure rise.
OIL PUMP ASSEN\BL Y
OIL PRESSURE
SWITCH
DISASSEMBLY
....... GASKET
Oil Filter and Oil Pump
1. Remove the oil filter.
FILTER
2. Remove the pump cover assembly, housing and gasket.
INSPECTION
Oil Pump
1. Outer rotor to body clearance. Using a feeler gauge,
check the clearance between the outer rotor and body. If
excessive, .replace the rotor assembly.
OUTER ROTOR TO HOUSING CLEARANCE
2. Rotor clearance. Check the clearance between the outer
and inner rotors with a feeler gauge. If excessive, replace
the rotor assembly.
Check the Old pam 's coupling of the inner rotor shaft for
cracks, damage and wear.
FEELER GAU(lE
~'P=~=FSTANDARD
VALUE 0.15-0.2
REPLACE VALUE 0.15-0.3
OUTER ROTOR TO iNNER
ROTOR CLEARANCE .
Engines & Generators
35