Glow Plugs/Fuel Injectors - Westerbeke 44A FOUR - 35C THREE Operator's Manual

GLOW PLUGS
DESCRIPTION
The glow plugs are wired through the preheat solenoid.
When PREHEAT is pressed 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 terminal 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
oil deposits. While cleaning, examine the tip for wear and
burn 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 0.4 - 0.6 ohm resistance. This method can be
used with the plug in or out of the engine. You can also use
an ammeter to test the power drain (5-6 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.
+
FUEL INJECTORS
In case of severe vibrations and detonation noise, have the
injectors checked and overhauled by an authorized fuel
injection service center. Poor fuel quality, contaminants and
loss of positive fuel pressure to the injection pump can result
in injector faults. Since fuel injectors must be serviced in a
clean room enviroment, it is best to carry at least one extra
injector as a spare should a problem occur.
Before removing the old injector, clean the area around the
base of the injector to help prevent any rust or debris from
falling down into the injector hole. If the injector will not lift
out easily and is held in by carbon build-up or the like, work
the injector side-to-side with the aid of the socket wrench to
free it, and then lift it out.
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 com-
pound on the threads.
A
WARNING:
Do not keep a glow plug on for more
than 30 seconds.
Glow Plug Tightening Torque 7 - 11 ft-lb (1.0 -1.5 m-kg)
TESTING A GLOW PLUG
WITH AN OHMMETER
TIP
The injector seats in the cylinder head on a copper sealing
washer. This washer should be removed with the injector and
replaced with a new washer when the new injector is
installed.
Injector to Cylinder Head Tightening Torque 40
±
4 ft-lb (5.5
±
0.5 kgf-m)
FUEl INJECTOR
20