Onan MEP-003A - CHAPTER 8 MAINTENANCE OF GENERATOR ASSEMBLY; Section I. DESCRIPTION AND FUNCTION; Section II. MAINTENANCE

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
4. STARTER WILL NOT ENGAGE FLYWHEEL .
Step 1. Check starter clutch ( bendix ) and pinion ( paragraph 5-2 ) .
Repair
or
replace
as
necessary .
Step 2. Check for damaged ring gear ( paragraph 7-4 ) .
Replace
ring
gear
if
necessary
.
5. ENGINE WILL NOT START WHEN CRANKED .
Step 1. Check for faulty injection caused by dirty fuel .
Replace with clean fuel . Service fuel filters . Clean and if necessary repair or
replace fuel injection nozzle ( paragraph 7-20 ) .
Step
2.
Check
for
poor
compression
.
See malfunction 14 .
Step 3. Incorrect timing .
Retime
engine
(
paragraph
7-18
)
.
6. ENGINE MISFIRES .
Step
1.
Check
for
poor
compression
.
See malfunction 14 .
Step 2. Check for defective or dirty injection nozzles ( paragraph 1-20 ).
Clean or replace nozzles .
Step 3. Check for broken valve spring ( paragraph 7-9 ) .
Replace
broken
springs
.
Step 4. Check cylinder head assembly for build - up of carbon ( paragraph 7-9 ) .
Clean
carbon
from
cylinder
head
assembly .
7.
LOW
ENGINE
POWER
.
Step
1.
Check
for
poor
compression
.
See malfunction 14 .
Step 2. Check for incorrect timing .
Adjust injection timing if necessary ( paragraph 7-18 ) .
8.
LOW
OIL
PRESSURE
.
Step 1. Check to see if oil by - pass is stuck open ( paragraph 7-13 ) .
Clean or replace oil by - pass valve and spring .
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