Glow Plugs - Westerbeke 12C- TWO 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 tlrreads 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 m\lch, 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.- to 1.5-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
(8 to 9 amps per plug).
A
WARNING:
These plOW plugs will become very hot
to the touc". Be carefurnot til bum,yourJingers When
testing the plugs . , . ' . .
Re-install the plugs in the engine and test them again. The
plugs should get very hot (at the terminal end) within 20. to
25 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 tlrreads.
Glow Plug Tightening Torque 7 -11 Ib-ff (1.0 -1.5 kg-m) ,
A
WARNING:
00 not keep
a
glow plug on for more
than 30 seconds
TERMINAL ..... ____
Tightening tOl'flue:
(1.0
-1.5
m-kg (7· IIft-lb)
GLOW PLUG
THE OHMMETER TEST
GLOW PLUG
...>'..-l-~~
Engines
&
Generators .
28