Table 2-2. Generator Set Troubleshooting (Cont)
Malfunction
Probable cause
Corrective action
14.
Noisy turbo-
charger (Continued)
b. Excessive turbo-
charger impeller
end play.
b.
Measure end play (para 14-52).
Disassemble and add correct
number of shims (para 14-52
and 14-55).
a.
Inspect turbocharger. Replace
shaft seal ring (para. 14-53,
thru 14-55).
15.
Turbocharger
leaks oil
Worn or broken
turbocharger
shaft seal
ring.
Worn or broken
turbocharger
oil pressure
and drain seal
rings.
b.
Inspect turbocharger. Replace
turbocharger oil pressure and
drain seal rings (para 14-53
thru 14-55).
16.
Excessive
gear noise
around front
of engine
Defective
vibration
dampener.
a.
Inspect vibration dampener.
Replace vibration dampener
(para 14-60,14-61 and 14-63).
a.
Inspect timing gears (para
14-73). Replace timing
gears (para 14-72 and 14-75).
Excessive tim-
ing gear
backlash.
b.
17.
Low engine
compression
Defective
piston rings.
Replace piston rings (para
14-81 thru 14-83).
a.
a.
Replace pistons (para 14-81 and
14-83) and cylinder sleeves
(para 14-85 thru 14-87).
b.
Defective
pistons and
cylinder
sleeves.
b.
Leaking or
defective
valves.
c.
Isolate trouble (para 14-77).
Replace valves (para 14-77
thru 14-79).
c.
18.
Main generator
output voltage
too low
Exciter-
regulator
defective.
Check exciter regulator (para 8-3).
Replace exciter voltage regulator
(para 8-10 thru 8-14).
a.
a.
Rotor assembly
defective.
Check rotor resistance.
Check for shorts or
grounds. Replace, repair
or rebuild if required (para 9-2,
9-3,9 -4,9-6 and 9-7).
c. Stator
defective.
c.
Check stator resistance.
Check for grounds or shorts.
Replace, repair or rebuild
if required (para 9-2, 9-3, 9-4,
9-6 and 9-7).
d.
Exciter rotor
defective.
Check exciter resistance.
Check for shorts or grounds
(para 9-2). Replace exciter
if defective. (para 9-5, 9-6
and 9-7).
e.
Exciter stator
defective.
Check exciter stator resistance.
Check for shorts or grounds
(para 9-2). Replace exciter
stator (para 9-5,9-6 and 9-7).
e.
2-14
