Oil Pressure; Testing Oil Pressure - Westerbeke 8.0KW BTDAR Operator's Manual

OIL PRESSURE
DESCRIPTION
The lubricating system is a pressure feeding system using
an oil pump. The engine oil is drawn from the oil sump by
the oil pump, which drives the oil, under pressure, through
the oil filter, oil cooler and various lubricating points in the
engine. The oil then returns to the oil sump to repeat the
continuous cycle. When the oil pressure exceeds the speci-
fied pressure, the oil pushes open the relief valve in the all
pump and returns to the oil sump, keeping the oil pressure
. within its specified range.
OIL PRESSURE
The engine's oil pressure, during operation, is indicated by
the oil pressure gauge on the instrument panel. During nor-
mal operation, the oil pressure will range between 30 and
60 psi (2.1 and 4.2 kg/cm').
NOTE: A newly started, cold engine can have an oil pressure
reading up to 60 psi (4.2 kg/em'). A warmed engine· can have
an oil pressure reading as low as 35 psi (2.5 kg!cm'). These
readings will vary depending upon the temperature ojthe
engine and the rpms.
OIL PRESSURE
OWITrl •.
[NORMALLY OPENI
OIL PREiISURE-,.,:':
SENDDR
TESTING OIL PRESSURE
To test the oil pressure, remove the oil pressure sender, then
install a mechanical oil pressure gauge in it's place. After
warming up the engine, set the engine speed at 1800 rpm
and read the oil pressure gauge.
Oil Pressure 35.0 IbM (3.8 kg/em') or more at 1800 rpm.
Sender and Swlteh Torgue 9 ·13 ff-Ib (1.2 -1.8 m - kg).
FROM ENGINE
BLOCK
TESTING DlL
PRESSURE
OIL PRESSURE
MECHANICAL OIL
PRESSURE GAUGE
"
LOW OIL PRESSURE
The specified safe minimum oil pressure is 4.3 + 1.4 psi (0.3
+
0.1
kgicm'). A gradual loss of oil pressure usually indicates
a worn bearings. For additional information on low oil pres-
sure readings, see the ENGINE TROUBLESHOOTING chart .
. OIL PRESSURE RELIEF VALVE
An oil pressure relief valve is located on the engine block
just below the injection pump. 1bis valve opens at
appoximately 50 psi [343 kpa] and maintains that pressure.
LOCATED JUST
UNDER THE
. fUEL INJECTION
P[jMPONTHE
ENGINE BLOCK.
Engines &. Generators
19