Glow Plugs; Oil Pressure; Engine Adjustments (Cont.) - Westerbeke 5.0Kw BCDR Operator's Manual

ENGINE ADJUSTMENTS
GLOW PLUGS
The glow plugs are wired through the preheat solenoid.
When PREHEAT is
pres~ed at the control panel this solenoid
should "click" on and the glow plug should begin to get hot.
INSPECTION
To inspect the plug, remove the electrical tenninal connec-
tions, then unscrew or unclamp each plug from the
~ylinder
head. Thoroughly clean each plug's tip and threads w,ith a
soft brush and cleaning solution to remove all the carbon and
oit"
deposits. While cleaning, examine the tip for wear and
bum erosion; if it has eroded too much, replace the plug.
TESTING
An accurate way to test glow plugs is with an ohmmeter.
Touch'one prod
to
,the glow plug's wire connection, and the
other
to
the body of the glow plug, as shown. A good; glow
plug will have a 1.0 - 1.5 ohm resistance. This method can be
used with the plug in or out of the engine. You can also use
an multimeter to test the power drain (8 - 9 amps per plug).
A
WARNING:
These glow plugs will become very hot
to the touch. Be careful not to burn your fingers when
testing the plugs •.
GLOW PLUGS
Re-install the plugs in the engine and test them again. The
plugs should get very hot
(at
the terminal end) within 7 to 15
seconds. If the plugs don't heat up quickly, check for a short
circuit. When reinstalling the glow plugs, use anti-seize
compound on the threads.
A
WARNING:
00 not keep
a
glow.p/ug on for more
than 30 seconds.
GLOW PLUG TIGHTENING TORQUE
1.0·1.5 M-KG (1-11 FHB)
II
TERMINAL END
TESTING WITH .
,__--"I.--=-_
AN OHMMETER ;,
.
~.
'PREHEAT ON
USING A
TEST LIGHT
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.
011 Pressure 35·55 (b/io' (2.5 - 3.B kg/cm')
LOW OIL PRESSURE
A gradual loss of oil pressure usually indicates a worn bear-
ings. A rapid loss of oil pressure indicates a specific bearing
failure. For I;ldditional information on low oil pressure read-
ings, see the ENGINE TROUBLESHOOTING chart.
TESTING OIL PRESSURE
OIL PRESSURE SWITCHES
There are two oil pressure switches. One is wired to the
automatic shutdown circuit (see safety shutdown switches)
to protect the engine from a sudden loss of oil or very low oil
pressure.
The other oil pressure switch is available for connecting to
an (optional) audible alarm that would sound a low pressure
alarm (before the shutdown switch activates and shuts the
engine down).
Note that this audible alarm will sound momentarily when
the engine is started and sound again when the engine is shut
off. this occurs as the oil pressure drops below 10 psi.
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Engines & Generators
24