ENGINE
3.57
TROUBLESHOOTING, CONT
Piston Failure - Scoring
G Lack of lubrication
G Dirt entering engine through cracks
in air filter or ducts
G Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
G Excessive piston-to-cylinder
clearance
G Wet sumping
G Worn rings, piston, or cylinder
G Worn valve guides or seals
G Restricted breather
G Air filter dirty or contaminated
Low Compression
G Cylinder head gasket leak
G No valve clearance ( cam wear )
G Cylinder or piston worn
G Piston rings worn, leaking, broken,
or sticking
G Bent valve or stuck valve
G Valvespringbrokenorweak
G Valve not seating properly (bent or
carbon accumulated on sealing
surface)
G Rocker arm sticking
Backfiring
G ETC or speed limiter system
malfunction
G Fouled spark plug or incorrect plug
or plug gap
G Carburetion faulty - lean condition
G Exhaust system air leaks
G Ignition system faulty:
Spark plug cap cracked/broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Ignition timing incorrect
Sheared flywheel key
G Poor connections in ignition system
G Valve sticking
G Air leaks in intake
G Lean condition
COOLING SYSTEM
TROUBLESHOOTING
Overheating
G Low coolant level
G Air in cooling system
G Wrong type/mix of coolant
G Faulty pressure cap or system
leaks
G Restricted system (mud or debris in
radiator fins causing restriction to
air flow, passages blocked in
radiator, lines, pump, or water
jacket, accident damage)
G Lean mixture (restricted jets, vents,
fuel pump or fuel valve)
G Fuel pump output weak
G Electrical malfunction
G Water pump failure/ Loose impeller
G Thermistor failure
G Cooling fan inoperative or turning
too slowly (perform current draw
test)
G Ignition timing misadjusted
G Low oil level
G Spark plug incorrect heat range
G Faulty hot light circuit
G Thermostat stuck closed or not
opening completely
Temperature Too Low
G Thermostat stuck open
Leak at Water Pump Weep Hole
G Faulty water pump mechanical seal
(coolant leak)
G Faulty pump shaft oil seal (oil leak)
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