Table 2-2. Generator Set Troubleshooting (Cont)
Malfunction
Probable cause
Corrective action
3.
Engine runs when START -
_. Defective stop-
a
a. Replace defective relay Kl in
STOP-RUN switch is held
run relay (Kl).
generator control assembly
in START position, but
(fig
3-3 and 3-5).
stops when switch is put in
RUN
b.
Defective overvolt-
b. Test overvoltage relay. Replace
—
age relay (K2).
defective relay (para 8-6).
c.
Defective fuel level
c. Replace defective relay K8 in
—
relay
the special relay assembly
(para 8-6).
4.
Engine runs rough
a.
Incorrect timing.
a. Time engine as illustrated in
—
—
figure 14-25.
b.
Defective fuel in-
b. Check fuel injection pump
—
jection pump.
(para. 14-44). Repair or re-
place fuel injection pump
(para 14-44 and 14-45).
c.
Nozzle injector
c. Repair or replace nozzle
—
assembly mal -
injector assemblies (para
function.
14-38 thru 14-41).
d.
Sticking valves.
d. Check valves and springs
(para. 14-77). Repair or replace
valves (para 14-77 thru 14-78).
e.
Blown cylinder head
e. Replace cylinder head gasket
gasket.
(para 14-79. )
f.
Defective cylinder
f. Replace cylinder sleeve (para
—
sleeve.
14-85 thru 14-87).
g.
Defective piston.
g. Replace piston assembly (para
—
14-81 thru 14-83).
h.
Broken or bent
h. Inspect valve operating mech-
—
push rod.
anism. Replace defective push
rod (para 14-77).
5.
Engine runs erratically
a.
Improper fuel
a. Time fuel injection pump
or misfires
timing.
(para 14-4 9).
b.
Improper governor
b. Adjust governor (para 7-8).
adjustment.
c.
Defective fuel in-
c. Inspect fuel injection pump,
jection pump.
Replace or repair (para
14-49, 14-44 and 14-45).
d.
Deleted
e. Worn camshaft bear -
e. Replace camshaft bearing
ings.
(para 14-85 and 14-87).
6.
Engine runs but fails to
a.
Improper governor
a. Adjust governor (para 7-8).
reach rated speed
adjustment.
Change 5
2-11
