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.
+
Engines· & Generators
26
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