3.9
ENGINE
3
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Cooling System
System Pressure Test
1. Remove radiator cap cover located in storage box.
2. Remove recovery bottle hose from coolant filler.
3. Connect a Mity Vac™ (PN 2870975) to radiator and
pressurize system to 10 PSI (68.9 kpa). The system
must retain 10 lbs of pressure for five minutes or
longer. If pressure loss is evident within five minutes,
check radiator, all cooling system hoses and clamps,
or water pump seal.
Radiator Cap Pressure Test
1. Remove radiator cap and test using a cap tester
(commercially available).
2. The radiator cap relief pressure is 13 lbs (89.6 kpa).
RECOMMENDED COOLANT
Use only high quality antifreeze/coolant mixed with
distilled water in a 50/50 or 60/40 ratio, depending on
freeze protection required in your area.
Radiator and Coolant Flow
Never remove radiator cap when engine is warm or hot.
The cooling system is under pressure and serious burns
may result. Allow the engine and cooling system to cool
before servicing.
Radiator
Water Pump
Cylinder
Cylinder
Thermostat
FLOW
Head
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