Onan MEP-003A - Page 37

TM5-6115-585-34
NAVFAC
P - 8-262-12
TO
- 35C2-3-455-2
TM
- 05684C
- 34
Table 2-3 . Troubleshooting ( Cont )
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
15.
STICKING
VALVES
(
CONT
).
Step 3. Check clearance between valve stem and guide ( paragraph 7-9 ) .
Correct clearance .
16. ENGINE RUNS NORMALLY BUT GENERATOR HAS NO OUTPUT .
Step 1. Check voltage regulator ( paragraph 6-6 ) .
Repair
or
replace
regulator
.
Step 2. Check exciter field ( stator ) for open or shorted windings ( paragraph 8-2 ) .
Replace
stator
if
necessary
.
Step 3. Check diodes on exciter rotor ( paragraph 8-2 ) .
Replace
diodes
if
necessary
.
Step 4. Check generator field ( rotor ) for open or shorted windings ( paragraph 8-2 ) .
Replace
rotor
if
necessary
.
Step 5. Check generator rotor flashing circuit ( paragraph 6-9 ) .
Replace diode CR2 or bridge rectifier .
Step 6. Check generator stator for open , shorted , or grounded windings ( paragraph 8-2 ) .
Replace
stator
if
necessary
.
Step 7. Check exciter rotor for open , shorted , or grounded windings ( paragraph 8-2 ) .
Replace
exciter
rotor
if
necessary
.
Step 8. Check bridge assembly A4 for defective resistor or diodes ( paragraph 6-9 ) .
Replace defective resistor or diodes
17. ENGINE RUNS NORMALLY BUT GENERATOR HAS LOW OUTPUT .
Step 1. Check voltage regulator ( paragraph 6-6 ) .
Adjust , repair , or replace regulator .
Step 2. Check generator stator for open or shorted windings ( paragraph 8-2 ) .
Replace
stator
.
Step 3. Check exciter rotor for shorted windings ( paragraph 8-2 ).
Replace
rotor
.
Step 4. Check diodes on exciter rotor ( paragraph 8-2 ) .
Replace
diodes
as
necessary
.
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