Onan 6GO-F - Page 41

SERVICE DIA,GNOSIS
POSSIBLE CAUSE
REMEDY
SHARP METALLIC THUD, ESPECIALLY WHEN COLD ENGINE FIRST STARTED
Low oil supply".
Low oil pressure.
011 badly diluted.
PINGING SOUND WHEN
Carbon in cylinders.
Spark too early.
Wrong spark plugs.
Add 011.
Refer to symptom of low pressure for
remedies.
Change oil.
~1GINE IS RAPIDLY ACCELERATED OR HEAVILY LOADED
Spark plugs burned or carboned.
Valves
hot.
Fuel stale or low octane.
Lean fuel mixture.
Remove carbon.
Retime
ignition. See IGNITION TIMING.
Install Champion J8 plugs.
Install new plugs.
Adjust tappet clearance. See TAPPET
ADJUS'l'MEN T.
Use good fresh fuel.
Clean carburetor.
ENGD1E CFUU~KS TOO STI~FLY
Too heavy oil in crankcase.
Drain,
refill with lighter ~il.
Engine stuck.
Disassemble and repair.
ENGINE WILL NOT b'TART WHEN CRllNKlID
.Faulty ignition.
Lack of fuel or faulty
carburetion.
Clogged fuel screen.
Cylinders flooded.
Poor
fuel.
Poor compression.
Wrong timing.,
Clean,
adjust, or replace breaker
points, plugs, condenser, coil, etc.,
or retime ignition.
Refil:).. the tank. Check the fuel
system., Clean, adjust, or' replace
parts necess~ry.
Clean.
Crank tew
t:tm,es with spark plugs
removed. '
Drain, refill witb'goodfuel. "
Ti~t.~ cylinder head and spark plugs.
If still not corrected, grind the
valves. R~p:1::ace piston rings, if
necessary. See MAINTENANCEAND,aEPAIR.
Retilne ignition. See IGNITION TDlING.
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