Engine Adjustments (Cont.); Testing Glow Plugs; Testing Oil Pressure - Westerbeke 5.0KW BCD 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
tlns
solenoid
should "click" on and the glow plug ShOldd begin to get hot.
INSPECTION
To inspect the plug, remove the electrical tenninal connec- .
tions, then unscrew or unclamp each plug from the cylinder
head. Thoroughly clean each plug's tip and threads with a'
soft brush and cleaning solution to remove all the carbon and
oir" 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, arid 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 tenninal end) within 7 to 15
seconds. If the plugs don't heat up quickly, check for a short
circuit. When reinstallillg the glow plugs, use anti-seize
compound on the threads.
A
WARNING:
00 not keep
a
g/owp/ug on for more
than 30 seconds.
GLOW PLUG TIGHTENING TORQUE
1.0-1.5M-KG(7-11 FT-L8)
TESTING WITH .
. AN OHMMETER
PREHEAT ON
TERMINAL END
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 en~ine, set the engine speed at 1800 rpm and ,
read the oil pressure gauge.
Oil Pressure 35 - 55 Ib/ln
2
(2.5 • 3.B kg/cm
2 )
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
I
failure. For.additional 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
26