2007-2011 Polaris IQ Snowmobiles Service Manual, Page 228Get this manual
Engine and Cooling Systems Crankshaft Index
Polaris crankshafts are pressed togetherThe connecting rod journal center lines are indexed 180 apart from each otherIt is sometimes necessary to check multi-cylinder crankshafts to verify that one cylinder has not been forced out of position relative to the other cylinderSome causes for "out of index" crankshaft include but are not limited to the following: Hydrolock from water or fuel Impact to drive clutch from object or accident Abrupt piston or other mechanical failure Engine lock-up due to drive belt failure 345678mounted concentrically with the crankshaft center lineWith section of wire (wire coat hanger), anchor it to convenient spotBend one end at the outer perimeter of the degree wheel as shown belowInstall dial indicator into the magneto end cylinder spark plug holeThe ignition timing is referenced by the magneto endLocate TDC as accurately as possible by finding the center of the point where there is no piston movement note the "Zero" the dial indicator at this pointContinue to rotate the crankshaft in the normal direction of rotation until the dial indicator reads .100" (2.54mm) after top dead center (ATDC)Bend the pointer or move the degree wheel until the pointer aligns with 180 mark on the degree wheelWith the pointer aligned, make sure the degree wheel and pointer are secured and will not move out of positionRe-check accuracy of this location few timesThe pointer should align with the 180 mark when the dial indicator reads .100" (2.54mm) ATDC