Index Snowmobiles / ATV Snowmobile Polaris DEEP SNOW (TRAIL RMK, 600 RMK, 700 RMK, 800 RMK, 900 RMK, 600 SWITCHBACK, 800 SWITCHBACK) - service manual 2005 year
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GENERAL INFORMATION 2.15 CRANKSHAFT INDEXING Dial Indicator Degree Wheel .100 ATDC Crankshaft center line Dial Indicator Degree Wheel .100 ATDC MAG PTO CAUTION: Disconnect battery ground cable and ALL spark plug high tension leads: ground high tension leads to engine. Disconnect lanyard (if equipped) and or press engine stop switch before proceed- ing with this following procedure. Polaris crankshafts are pressed together or ‘‘indexed” so the connecting rod journal center lines are 180_ (twins). It is sometimes necessary to check multi-cylinder crankshafts to verify that one cylinder has not been forced out of position rela- tive to the other cylinder or cylinders. Some causes for out-of-index crankshafts include but are not not limited to: S Hydraulock from water or fuel S Impact to drive clutch from foreign object or accident S Abrupt piston or other mechanical failure S Engine lock--up due to drive belt failure REQUIRED SERVICE: Belt Removal, Drive Clutch Removal Securely fasten a degree wheel on the flywheel or PTO end of crankshaft. Use a large degree wheel for more accuracy, and make sure it is mounted concentrically with the crankshaft center line. Sharpen a coat hanger or section of welding rod and anchor it to a convenient spot. Point the sharpened end at the outer perimeter of the degree wheel. Install a dial indicator into the magneto end cylinder spark plug hole. (The ignition timing is referenced by the magneto end.) With the indicator installed on the MAG cylinder rotate the engine to bring the piston to top dead center (TDC). Locate TDC as accurately as possible by finding the center of the point where there is no piston movement then ‘‘Zero” the dial indicator at this point. Continue to rotate the crankshaft in the normal direction of rotation until the dial indicator reads .100” (2.54mm) after top dead center (ATDC). With the pointer aligned, make sure the degree wheel and pointer are secured and will not move out of position. Re-check accura- cy of this location a few times. The pointer should align with the 180_ mark when the dial indicator reads .100“ (2.54mm) ATDC. IMPORTANT: Do not move the crankshaft, degree wheel or pointer after the initial setting on the MAG end cylinder -- simply read the wheel and dial indicator. Remove the dial indicator and install in PTO cylinder. Repeat finding TDC. Note the degree wheel indication when the dial indica- tor reads .100” ATDC. It should be 180_ (± 2_) from the MAG cylinder mark. |