33
Chapter 13
TROUBLESHOOTING
A. COMMON TROUBLES AND REMEDIES.
The following charts list the most common troubles
experienced with gasoline engines. Possible causes of
trouble are given along with probable remedy.
B. 4-CYCLE ENGINE TROUBLESHOOTING CHART
Cause Remedy and Reference
ENGINE FAILS TO START OR STARTS WITH DIFFICULTY
No fuel in tank Fill tank with clean, fresh fuel.
Shut-off valve closed Open valve.
Obstructed fuel line Clean fuel screen and line. If necessary, remove and clean
carburetor.
Incorrect Timing Flywheel key has sheared or partially sheared. Replace key.
Tank cap vent obstructed Clean the vent or replace the cap.
Water in fuel Drain tank. Clean carburetor and fuel lines. Dry spark plug
points. Fill tank with clean, fresh fuel.
Engine flooded Close fuel shut-off, if so equipped, and pull starter until engine
starts. Reopen fuel shut-off for normal fuel flow.
Loose or defective ignition wiring Check ignition wiring for shorts or grounds; repair if
necessary.
Spark plug fouled Replace spark plug.
Spark plug porcelain cracked Replace spark plug.
Poor Compression Overhaul engine.
No spark at plug Check ignition air gap. If air gap is correct and there is no
spark at plug replace ignition.
Electric starter does not crank engine See 12 volt starter troubleshooting chart.
ENGINE KNOCKS
Carbon in combustion chamber Remove cylinder head and clean carbon from head and
piston.
Loose or worn connecting rod Replace connecting rod.
Loose flywheel Check flywheel key and keyway; replace parts if necessary.
Tighten flywheel nut to proper torque.
Worn cylinder Replace cylinder.
Improper ignition timing Flywheel key has sheared or partially sheared. Replace key.
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