crankshaft, replacement for STIHL 031AV chainsaw, BOX 6215 K Key benefits Restores engine rotation and timing so the saw runs smoothly after crankshaft failure or wear. Direct replacement designed to match original fit and mounting points for model 031AV, reducing installation time. Returns balanced operation to reduce vibration and uneven wear on bearings and connecting components. part condition eliminates performance issues caused by a worn or damaged crankshaft. What this part does Converts piston reciprocating motion into crankshaft rotation to drive the flywheel and clutch. Provides the central rotating support for connecting rod and bearings, maintaining engine timing and balance. Serves as the core mechanical component when rebuilding or repairing the lower end of the engine. Compatibility and specifications Replacement crankshaft compatible with model 031AV chainsaw (compatibility reference). Supplied as BOX 6215 K for identification and tracking. Manufactured and finished to meet the dimensional and fit requirements of the original replacement specification for this model. Installation and maintenance notes Intended as a replacement component for engine rebuilds or repairs; inspect bearings, seals, and connecting rod for wear when installing. Professional installation or experienced mechanical skills are recommended to ensure correct clearances, torque values, and alignment. Use during scheduled rebuilds or after failure to prevent secondary damage to crankcase, bearings, and piston assembly. Typical use scenarios a seized or cracked crankshaft after engine overheating or lubrication failure to restore operable condition. Rebuild a used or hour chainsaw to original running standards during maintenance or before resale. Keep as a spare part onsite for field repairs when servicing multiple saws to minimize downtime. Why choose this replacement condition replacement engineered to match the original part geometry and mounting features for model 031AV. Clear identification as BOX 6215 K helps confirm correct part selection for maintenance and repairs. Compatibility reminder Confirm model number 031AV before ordering to ensure proper fit and function.