Engine Lubricating Oil; Oil Change; Oil Pressure - Westerbeke 8.0 BTD Operator's Manual

ENGINE LUBRICATING OIL
ENGINE
OIL
CHANGE
SUMP
DRAIN
HOSE......,_,___..._
FOR EXTENSION
1/4" NPT
6"0.D.
1. Draining the Oil Sump. Discharge the used oil through
the sump drain hose (attached to the front of the engine)
while the engine is wann. Drain the used oil completely,
replace the hose in its bracket, and replace the end cap
securely.
NOTE: Thread size for the lube oil drain hose capped end
is
114 NPT.
DRAIN THE OIL FROM THE
FI U"ER BEFORE
REMOVING THE FILTER
FROM THE HOUSING
SPIN ON
OIL FILTER
TWiN !·/AND TIGHT AGAINST
O·RING, THEN TIGHTEN
213 OF A TURN.
AP.I'LY CLEAN
ENCi/NE OIL
WHEN JNSTALL/tvG
2. Replacing the Oil Filter. When removing the used oil fil.
ter, you may find it helpful and cleaner to punch a hole. in
the upper and lower portion of the old filter to drain the
oil from it into a container before removing it. 'Ibis helps
to lessen spillage. A small automotive filter wrench
should be helpful in removing the old oil filter.
NOTE: Do not punch this hole without first loosening the
filter to make certain it can be removed.
Place some paper towels and a plastic bag around the fil-
ter when unscrewing it to catch any oil left in the filter.
(Oil or any other fluid on the engine reduces the engine's
cooling ability. Keep your engine clean.) Inspect the old
oil filter as it is removed to make sure that the fllbber
sealing gasket comes off with the old oil filter.
If
this rub-
ber sealing gasket remains sealed against the filter
bracket, gently remove it.
When installing the new oil filter element, wipe the filter
gasket's sealing surface on the bracket free of oil and
apply a thin coat of clean engine oil to the rubber gasket
on the new oil filter. Screw the filter onto the threaded oil
filter nipple on the oil filter bracket, and then tighten the
filter firmly by hand.
19
NOTE: Generic filters are not recommended, as the mater-
ial standards or diameters of important items on generic
parts might be entirely different from genuine parts.
Immediately after an oil filter change and oil fill,
run
the
engine to make sure the oil pressure is normal and that
there are no oil leaks around the new oil filter.
3. Filling the Oil Sump. Add new oil through the oil filler
cap on the top of the engine or through the side oil fill.
After refilling, run the engine for a few moments while
checking the oil pressure. Make sure there is no leakage
around the new oil filter or from the oil drain system, and
stop the engine. Then check the quantity of oil with the
lube oil dipstick. Fill to, but not over the high mark on
the dipstick, should the engine require additional oil.
OIL PRESSURE
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 oil
pump and returns to the oil sump, keeping the oil pressure
withln its specified range.
The engine's oil pressure, during operation, is indicated
by the oil pressure gauge on the instrument panel. During
normal operation, the oil pressure will range between 40 and
60 psi (2.8 and 4.2 kg/cm
2 ).
NOTE:
A newly started, cold engine ·can have an oil pressure
reading up to 60 psi (4.2 kg!crrf). A warmed engine can have
an oil pressure reading as low as 35 psi (2.5 kg/cm
2 ).
These
readings will vary depending upon the temperature of the
engine and the rpms.
LOW OIL
PRESSURE
The specified safe minimum oil pressure is 4.3
+
1.4 psi (0.3
+
0.1 kg/cm 2 ).
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.
Q)l~
·--~~hl
N.OTE: To test the oil pressure, install a mechanical pressure
gauge as shown. Warm up the engine and read the oil pres-
sure gauge. Oil Pressure should be 35.0 lb/in
2
(3.8 Kg!cnt)
or more at 1800 rpm.