Glow Plug Testing - Westerbeke 11.5KW-60Hz Service Manual

GLOW PLUG TESTING
GLOW PLUGS
To inspect the plug, remove the electrical terminal connections,
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 bum erosion; if it
has eroded too much, replace the plug.
An
accurate way to test glow plugs is with an ohnuneter.
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 a
multimeter
to
test the power drain (8 - 9 amps per plug).
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:
These glow plugs will bilcome very hot
to the touch. Be careful not to bum your fingers when
testing the plugs. .
TESTING A GLOW PLUG
WITH AN OHMMETER
TESTING A GLOW PLUG
USING A .TEST LIGHT
TERMINAL
.END·
TIP
+
A
WARNING:
Do not keep a glow plug on fOf more
than 30 seconds.
GLOW PLUG TIGHTENING TORQUE. 7 -11 R·lb (1.0 ·1.5 m-kg)
Engines
&
Generators
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