1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 172Get this manual
ENGINECOOLING DisassemblyInspectionPolaris Engines
Piston Pin Needle Bearing Inspection
1 Clean needle bearing in solvent and dry with compressed air
2Inspect needle cage carefully for cracks or shiny spots which indicate wearReplace needle bearings if worn or cracked, and always replace them if piston damage has occurred
3Visually inspect piston pin for damage, discoloration,
or wearRun your fingernail along the length of the pin and replace it if any rough spots, galling or wear is detectedMeasure piston pin
Connecting Rod Small End Inspection
1 Clean small end of connecting rod and inspect inner bore with magnifying glass Look for any surface irregularities including pitting, wear, or dents
2Run your fingernail around the inside of the rod and check for rough spots, galling, or wear3Oil and install needle bearing and pin in connecting rodRotate pin slowly and check for rough spots or any resistance to movementSlide pin back and forth through bearing while rotating and check for rough spots