Cooling System - Polaris Sportsman 700 Efi 2005 Service Manual

ENGINE
TROUBLESHOOTING, CONT
Piston Failure - Scoring
Lack of lubrication
S
Dirt entering engine through cracks
S
in air filter or ducts
Engine oil dirty or contaminated
S
Excessive Smoke and Carbon Buildup
Excessive piston-to-cylinder
S
clearance
Wet sumping
S
Worn rings, piston, or cylinder
S
Worn valve guides or seals
S
Restricted breather
S
Air filter dirty or contaminated
S
Low Compression
Cylinder head gasket leak
S
No valve clearance ( cam wear )
S
Cylinder or piston worn
S
Piston rings worn, leaking, broken,
S
or sticking
Bent valve or stuck valve
S
Valve spring broken or weak
S
Valve not seating properly (bent or
S
carbon accumulated on sealing
surface)
Rocker arm sticking
S
Backfiring
ETC or speed limiter system
S
malfunction
Fouled spark plug or incorrect plug
S
or plug gap
Exhaust system air leaks
S
Ignition system faulty:
S
Spark plug cap cracked/broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Ignition timing incorrect
Sheared flywheel key
Poor connections in ignition system
S
Valve sticking
S
3.60
Air leaks in intake
S
Lean condition
S

COOLING SYSTEM

TROUBLESHOOTING
Overheating
Low coolant level
S
Air in cooling system
S
Wrong type/mix of coolant
S
Faulty pressure cap or system
S
leaks
Restricted system (mud or debris in
S
radiator fins causing restriction to
air flow, passages blocked in
radiator, lines, pump, or water
jacket, accident damage)
Lean mixture (restricted jets, vents,
S
fuel pump or fuel valve)
Fuel pump output weak
S
Electrical malfunction
S
Water pump failure/ Loose impeller
S
Thermistor failure
S
Cooling fan inoperative or turning
S
too slowly (perform current draw
test)
Ignition timing misadjusted
S
Low oil level
S
Spark plug incorrect heat range
S
Faulty hot light circuit
S
Thermostat stuck closed or not
S
opening completely
Temperature Too Low
Thermostat stuck open
S
Leak at Water Pump Weep Hole
Faulty water pump mechanical seal
S
(coolant leak)
Faulty pump shaft oil seal (oil leak)
S