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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
Engine and Controls (cont).
Trouble, Symptom & Condition
5. Engine starts. Stops after a
few seconds by automatic
shut-down.
6. Engine runs at idle speed.
Engine "ON" indicating light
(25, Fig. 1) does not glow.
7. Engine will not come "up" to
governed speed in GEN mode.
March 28/94 Revised
Probable Cause
a. The shut-down circuit may
have functioned normally
to stop the engine because
of low lubricating oil
pressure.
b. Defective low oil pressure
switch (1, Fig. 4).
a. Lamp defective.
b. Indicating light body poorly
grounded.
a. 12-V DC power not
reaching governor control
box for following reasons:
b. Governor linkage binding
or governor throttle sticking.
c. Defective or mis-adjusted
magnetic pickup.
Corrective Action
Start the engine and observe oil
pressure gage. if pressure is less
than 12 PSI, stop engine at once
and check for cause of low
pressure. Repair as required..
Disconnect RED-YELLOW wire
at low oil pressure switch. Start
engine. Observe oil pressure. If
pressure is 38 PSI, or more,
check voltage between terminal
C of oil pressure switch (the
terminal withYELLOW-BLUE
wires) and ground. If approxi-
mately 12-V DC is indicated, the
oil pressure switch is defective.
Stop engine and replace switch.
Replace lamp.
Be sure light is grounded
properly.
Apply 12-V DC directly to
terminal "1" on governor control
box. If engine comes-up to
speed, check
following:
Check governor linkage and
throttle shaft for binding and
sticking. Repair as required.
The control unit may not be
receiving a signal from the mag
-netic pickup and the "fail -safe"
feature of the unit may be func-
tioning to prevent any signal
from reaching the actuator. To
check the magnetic pick-up,
disconnect pickup from control
unit and connect a high
impedance AC voltmeter to the
pickup output leads. Crank
engine but don't start. Voltage
reading should be a minimum of
(1) volt. If no voltage or low
voltage is indicated, check pickup
adjustment [See 2-3, Para. 4, E,
(2)]. If pickup is properly adjusted
and voltage is still zero, replace
pickup.
Chapter 3-1
Page 15
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