Onan MEP-003A - Page 35

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
8.
LOW
OIL
PRESSURE
(
CONT
).
Step 2. Check for worn oil pump ( paragraph 7-11 ) .
Replace
pump
.
Step 3. Check for worn engine bearings ( paragraph 7-17 ) .
Replace worn bearings .
9. HIGH OIL PRESSURE
Step 1. Check to see if oil by - pass is stuck closed ( paragraph 7-13 ) .
Clean or replace oil by - pass valve and spring .
Step
2.
Check
for
clogged
oil
passages
.
Clean
all
oil
lines
and
passages
.
10. EXCESSIVE OIL CONSUMPTION .
Step 1. Check for worn valve guides ( paragraph 7-9 ) .
Replace
guides
,
valves
,
and
seals
.
Step 2. Check for worn or sticking piston rings ( paragraph 7-10 ) .
Replace
rings
if
necessary
.
Step 3. Check for air leaks to crankcase .
Replace gaskets and seals as necessary .
11. BLACK SMOKEY EXHAUST AND EXCESSIVE FUEL CONSUMPTION
Step 1. Check for incorrect timing ( paragraph 7-18 ) .
Adjust
injection
timing
if
necessary
.
Step 2. Check for faulty injection pump or nozzles ( paragraphs 7-18 and 7-20 ) .
Repair , overhaul , rebuild , or replace pump and nozzles as necessary .
Step 3. Check valve condition ( paragraph 7-9 ).
Replace
worn
valves
.
12. TAPPING OR CLICKING SOUND FROM CYLINDER HEAD .
Step 1. Check for too great a valve clearance ( paragraph 7-9 ) .
Adjust
clearance
.
Step
2. Check
for
broken
valve
spring
(
paragraph
7-9
) .
Replace broken springs .
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