Onan MCCK - Page 24

POSSIBLE CAUSE REMEDY
POSSIBLE CAUSE
REMEDY
PINGING SOUND WHEN ENGINE IS SUDDENLY OR
HIGH OIL PRESSURE
HEAVILY LOADED
Defective gauge.
Replace.
Wrong spark plug.
Install correct spark plug.
Oil too heavy grade.
Drain. Refill.
Spark plug burned or
Install new plug.
carboned.
Clogged oil passages.
Clean all lines & passages
Fuel stale or low octane.
Use good, fresh fuel.
Oil relief valve stuck.
Clean by-pass,
if needed.
Replace
Lean fuel mixture.
Clean & adjust carburetor.
ENGINE
OVERHEATING
LIGHT POUNDING KNOCK
Poor coolant circulation.
Maintain supply.
Low oil supply.
Add oil.
Improper lubrication.
See Low Oil Pressure.
Oil badly diluted.
Change oil.
Adjust carburetor.
GENERATOR OVERHEATING
Fuel mixture too lean.
(Approximately I60°F higher than amibent)
Overloaded.
Reduce load.
Generator overloaded.
Reduce load.
VOLTAGE LOW AT FAR
t END OF LINE BUT
NORMAL NEAR
POWER PLANT
VOLTAGE DROPS
UNDER HEAVY LOAD
Line wire too small for
Install larger or extra wires
Engine lacks power.
See remedies for
engine
load and distance.
or reduce load.
misfires under heavy load.
Poor compression.
Tighten cylinder
head &
ELECTRIC MOTOR RUNS TOO SLOWLY AND OVER-
spark plugs.
HEATS AT FAR END OF
LINE BUT OK IF USED
NEAR POWER UNIT
Faulty carburetion.
Clean the fuel
system.
Line wire too small for
Install larger or extra
Clean, adjust or
replace
load and distance.
wires or reduce load.
parts necessary.
VOLTAGE UNSTEADY BUT
ENGINE NOT MISFIRING
Dirty flame arrester.
Clean.
Speed too low.
Adjust governor to correct
speed.
Restricted exhaust line.
Clean or increase the size.
Loose connections.
Tighten connections.
Choke partially closed.
See that it opens fully.
Fluctuating load.
Correct any abnormal load
Shorted field rectifier in
Check with ohmmeter.
condition causing trouble.
static exciter.
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