1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 207Get this manual
ENGINECOOLING Disassembly InspectionPro 785
Crankshaft Bearing Inspection
1 Clean crankshaft thoroughly and oil main and connecting rod bearings with Polaris Premium engine oilCarefully check each main bearing on the shaftNOTE: Due to extremely close tolerances, the bearings must be inspected visually, and by feelLook for signs of discoloration, scoring or gallingTurn the outer race of each bearingThe bearings should turn smoothly and quietlyThe inner race of each bearing should fit tightly on the crankshaftThe outer race should be firm with minimal side to side movement and no detectable up and down movementReplace any loose or rough bearings
Connecting Rod (Big End) Bearing Inspection
1 Measure connecting rod big end side clearance with feeler gaugeCompare to specifications Rotate rod on crankshaft and check for rough spots Check radial end play in rod by supporting rod against one thrust washer and alternately applying up and down pressureReplace bearingpinand thrust washers if side clearance is excessive or if there is any up and down movement detectable in the big end bearingNOTE: Specialized equipment and sound knowledge of crankshaft repair and straightening is required to perform crankshaft work safely and correctlyCrankshaft repair should be performed by trained Polaris service technicians in properly equipped shop