Service manual
GLOW
PLUGS
DESCRIPTION
The glow plugs are wired through the preheat soleniod.
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
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:
TIuIss
glow
plugs
will
becomll
VII"
ho'
'0
,he
'ouch.
BII
t:IIlflful
no'
'0
bum
,our
t1ngllfS
whlln
'lISting
'hII
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 threads.
A
WARNING:
Do
no'
kllllfJ
a
glow
plug
on
for
mom
than
30
stlt:Dnds
TERMINAL
END
Tightening
torque:
(J.O - 1.5 m-kg
(7·
iljt-lb)
GLOWPWG
THE
OHMMETER
TEST·
TIP
Engines
&
Generators
34