Onan CCK Series - Service Diagnosis Continued; Continued Smoke, Fuel Use, Low Power Issues; Light Pounding Knock Causes; Unexpected Engine Stops

'''84 SERVIC E DIAGNOSIS
POSSIBLE CA USE REMEDY .
BLACK,
SMOKY EXHAUST, EXCESSIVE FUEL CONSUMPTION
FOULING OF SPARK PLUG WITH BLACK SOOT, POSSIBLE LACK
OF POWER UNDER HEAVY
LOAD (Cant.)
<;hoke not fully open.
Dirty air cleaner.
Excessive crankcase pressure,
causing excessive fuel pump
pre$SUl'e.
See
that choke opens properly.
Clean. Refill·with proper oil.
Clean breather valve.
LIGHT POUNDING KNOCK
Loose connecting rod.
Adjust clearance or replace.
Low oil supply •
Add
oil. Change if necessary.
. Oil badly
diluted.
Drain. Refill with proper oil •.
Low oil pressure.
See "Low Oil Pressure" for re-
. medies.
ENGINE STOPS UNEXPECTEDLY
Empty fuel tank.
Refill.
Defective ignition system •.
Check the ignition system. Repair
or replace as needed. See that the
STOP button lead is not grounded,
DULL METALLIC THUD.
IF NOT ·BAD, MAY DISAPPEAR AFTER
FEW MINUTES OPERATION. IF BAD, INCREASES WITH LOAD
Loose crankshaft bearing.
Replace unless one of the next two
remedies permanently corrects
the trouble. .
SHARP METALLIC
THUD, ESPECIALLY WHEN COLD ENGINE
FIRST STARTED.
Low oil supply.
Addoil.
Oil badly diluted.
Change oil.