2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 79Get this manual

2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 79

ENGINE (300) 23Replace the main bearings if the components fail visual inspectionThe connecting rod utilizes roller bearingClearance can be measured with dial indicator to check radial clearanceVisually inspect the connecting rod, crank pin, and thrust washers for scoring, damage, excessive wear, or signs of overheatingCheck for roughness or noise when rotating the connecting rod on the crank pinReplace crankshaft if it fails visual inspection, or if any up and down movement is detectable in the connecting rod
Crankcase Oil PassagesPressure Relief Valve
1Remove the pressure relief valve assembly from the caseClean crankcase oil passages with clean solvent
Camshaft Chain

Back to 2008 Polaris ATV Sportsman 300 400 H.O. Service Manual