Engine Controls
Trouble, Symptom
Test, Check, And/or
and Condition
Probable Cause
Remedy
NOTE:
Diesel engine trouble shooting is covered in Cummins Operation Manual.
1.
Engine will not start. Starter
will NOT crank engine.
(See Fig. 1)
a.
Battery discharged, or
loose battery or ground
connection.
Check voltage across batteries.
Voltage should be
approximately 12.8 volts DC.
Check all battery terminals. Be
sure 12.8 volts DC is reaching
solenoid input terminal.
b.
Electrical defect in starter.
See fig. 1.
Momentarily connect a large
capacity jumper cable (No. 1/0
minimum) between hot side of
starter solenoid and starter
input terminal. If starter does
not crank engine, proceed to
step
c.
If starter does crank
engine, proceed to step
e.
c.
Mechanical defect in starter.
See fig. 1.
Remove starter motor from
engine and apply 12-V DC to
test it. If it doesn’t operate, it is
defective. Replace it. If starter
motor does operate, proceed to
step
d
.
d.
Internal seizure.
If battery and starter are good
and starter is unable to crank
engine, internal seizure is
indicated. Attempt to hand
crank engine with a 3/4 inch
square drive on a long flex
handle on crankshaft pulley. If
engine cannot be turned one
complete revolution, internal
seizure is indicated. Remove
engine and disassemble to
locate problem.
e.
Defective starter solenoid.
See fig. 1.
Momentarily connect a large
capacity jumper cable (No. 1/0
minimum) between the auxiliary
solenoid terminals (one on each
side). If engine does not crank,
replace starter solenoid. If
engine cranks, proceed to step
f
below.
f.
Defective auxiliary starter
solenoid. See fig. 1.
Momentarily jumper small lug
on front of auxiliary solenoid to
ground. If engine does not
crank, replace auxiliary starter
solenoid. If engine cranks,
proceed to step
g
below.
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
November 27/1997
Chapter 2-4
Page 7
