DC
ELECTRICAL
SYSTEM
ENGINE
12
VOLT
DC
CONTROL
CIRCUIT
The engine has a 12 volt DC electrical control circuit that is
shown on the wiring diagrams that follow. Refer to these dia-
grams when troubleshooting
or
when servicing the DC elec-
trical system on the engine.
DRIVE
BELT
ADJUSTMENT
A
CAUTION:
Drive
belts
must
be
properly
tensioned.
Loose
drive
belts
will not
provide
proper
alternator
charging
and
will
eventually
damage
the
alternator.
Drive
belts
that
are
too
tight will pull
the
alternator
out
of
alignment
and/or
cause
the
alternator
to
wear
out
pre-
maturely.
Belt tension adjustment is made by pivoting the alternator on
its base mounting bolt.
1.
Loosen the alternator adjusting strap bolt and the base
mounting bolt.
2.
Pivot the alternator on the base mounting bolt to the left
or right as required.
3. Tighten the base mounting bolt and the adjusting strap
bolt.
4.
Operate the engine for about 5 minutes at idle, then shut
down and recheck belt tension.
/<;_
BAnERYCARE
Review the manufacturer's recommendations and then
· establish a systematic maintenance schedule for your engine
starting batteries and house batteries.
• Monitor your voltmeter for proper charging during engine
operation.
• Check the electrolyte level and specific gravity with a
hydrometer.
• Use only distilled water to bring electrolytes to a proper
level.
• Make certain that battery cable connections are clean and
tight to the battery posts (and to your engine).
GLOW
PLUGS
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
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, and the
other to the body
of
the glow plug, as shown. A good glow
plug will have a
0.7-
0.8 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
- 9 amps per plug).
A
WARNING:
These
glow
plugs
will
become,
very
hot
to
the
touch.
Be
careful
not
to
bum
your
fingers
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 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:
Do
not
keep
a
glow
plug
on
for
more
than
3D
seconds.
GLOW
PLUG
TIGHTENING
TORQUE:
7-
11
Ft-lb
(1.0
-1.5
m-kg)
__.--TIP
TESTING
A
GLOW
PLUG
WITH
AN
OHMMETER
• Keep your batteries clean and free
of
corrosion.
+
4
Unlvarsal
21
To Next Page
Loading...
Need help?
General
