3
3.73
9924864 - 2012-2014 SPORTSMAN 800 / 6X6
© Copyright 2013 Polaris Sales Inc.
Piston Failure - Scoring
• Lack of lubrication
• Dirt entering engine through cracks in air filter or
ducts
• Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Wet sumping due to over-full crankcase
• Worn rings, piston, or cylinder
• Worn valve guides or seals
• Restricted breather
• Air filter dirty or contaminated
Low Compression
• Cylinder head gasket leak
• No valve clearance ( cam wear )
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon
accumulated on sealing surface)
• Rocker arm sticking
Backfiring
• ETC or speed limiter system malfunction
• Fouled spark plug or incorrect plug or plug gap
• Exhaust system air leaks
• Exhaust system air leaks
• Ignition system faulty: Spark plug cap cracked/
broken, Ignition coil faulty, Ignition or kill switch
circuit faulty, Ignition poor connections in ignition
system
• Timing incorrect, Sheared flywheel key
• Valve sticking
Cooling System
Overheating
• Low coolant level
• Air in cooling system
• Wrong type/mix of coolant
• Faulty pressure cap or system leaks
• Restricted system (mud or debris in radiator fins
causing restriction to air flow, passages blocked in
radiator, lines, pump, or water jacket, accident
damage)
• Lean mixture (restricted jets, vents, fuel pump or
fuel valve)
• Fuel pump output weak
• Electrical malfunction
• Water pump failure/ Loose impeller
• Thermistor failure
• Cooling fan inoperative or turning too slowly
(perform current draw test)
• Ignition timing mis-adjusted
• Low oil level
• Spark plug incorrect heat range
• Faulty hot light circuit
• Thermostat stuck closed or not opening
completely
• Possible diverter plate loose or missing inside
radiator
Temperature Too Low
• Thermostat stuck open
Leak at Water Pump Weep Hole
• Faulty water pump mechanical seal (coolant leak)
• Faulty pump shaft oil seal (oil leak)
ENGINE
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