TROUBLESHOOTING GASOLINE & LPENGINES PROBLEM
CAUSE
CORRECTION
Engine fails to start or is dif ficult to start (Cont’d)
The spark plugs are wet or dirty.
Clean or replace the spark plugs.
The spark plug gaps are wrong.
Re–gap or replace the plugs.
The ignition is out of time.
Retime.
Faulty condenser or coil.
Replace.
Faulty magneto or distributor.
Repair or replace.
The crankcase oil is too heavy (cold weather).
Use an engine oil of the proper viscosity.
The valves are leaking or sticking.
Clean and reseat the valves.
Incorrect valve tappet adjustment.
Adjust.
Cylinders dry due to engine having been out of use for some time (poor compression).
Restore compression by pouring a small amount of engine oil into the cylinders.
Loose spark plugs.
Install new gaskets & retorque plugs.
Damaged cylinder head gasket or loose cylinder head.
Install new gaskets & retorque head.
Piston rings stuck in piston.
Remove & clean the parts.
Scored cylinders (lack compression). Engine Misses.
Engine Surges or Gallops. Backfiring.
Engine Overheats.
of
Correct as required.
Spark plug gap incorrect.
Reset the spark plug gaps.
Wrong type spark plugs.
Check against recommendations.
Improper ignition timing.
Retime the engine.
Fouled spark plugs.
Clean or replace. Check cause of fouling.
Pitted breaker points.
Check for cause.
Loose ignition cables or worn or broken cables.
Correct as required.
Water in gasoline.
Drain & refill.
Poor compression.
Tighten cylinder heads and spark plugs.
Incorrect fuel mixture.
Readjust carburetor.
Dirty carburetor.
Clean.
Clogged fuel screen.
Clean.
Carburetor flooding.
Check carburetor adjustment.
Governor incorrectly adjusted.
Readjust.
Lean fuel mixture.
Readjust carburetor.
Improper ignition timing.
Retime.
Improper breaker point gap.
Readjust.
Sticky intake valve.
Correct as required.
Engine is overloaded.
Operate at a lower variable speed setting. Operate at a 3/4 to full throttle setting.
60 of 102
Engine cooling fins are dirty.
Clean the cooling fins thoroughly.
Engine has been operated with part of the shrouding removed.
Clean the cooling fins and replace the shrouding.
Dirty engine oil.
Change engine oil.
–46–
444, 500, 600 Loader Service Manual Supplement
Dealer Copy -- Not for Resale
444,500,600ServiceManualSupplement–#6556520–EngineService(Wiscosin)Section
