Onan MJA Series Service Manual page 15

,'.
TROUBLE-SHOOTING CHART
TROUBLE -SHOOTING CHART 1, THE ENGINE (Cont.)
1
TROUBLE
POSSIBLE CAUSE
I
Water in gasoline. IEngine misses
and backfires but
i
fails to start Air leaks around intake
manifold. manifold.
Improper firing order (JC).
Ignition timing incorrect.
r--- ­
Moisture on breaker points
Engine races (stop
Too much fuel caused by:
I
engine immediately
Disconnected governor
by pushing throttle mechanism. '
lever)
Engine stops
Emergency shutdown
unexpectedly
circuit operated.
I
Internal seizure.
To test, crank by hand
disassemble and repair.
Excessive crankcase
Remove and clean
pressure,caused by
breather.
clogged breather.
,-­
:
- ­
Low engine
Restricted air intake.
Clean air cleaner.
jPower
High exhaust back pres-
Check back pressure
sure.
Sect. 3.2.7.
- ­ - ­
-_
..
__
.....
_ - - _
.....
_­
13
RE:MEDY
I
Change fuel.
Inspect all gaskets on
Inspect ignition
distributor system.
Retime ignition.
Clean distributor.
Defective governor.
See Sect 3. 4 and
Trouble-Shooting Chart
Incorrect governor
5
adjustment.
Check low oil pressure
and high air temper ­
ature switches,
if
used.
Vapor lock in fuel line,
Allow engine to cool,
fuel pump or carburetor.
check for possible over ­
heating, Sect 3.1.2
Defective ignition.
See Trouble -Shooting
Chart 4.
I
Lack of fueL
Refill tank.
I