Product: Piston ring Quantity: 1 piston ring Why you need this part Restores compression and sealing in the combustion chamber to improve engine efficiency and start-up performance. Controls oil consumption and reduces blow-by, helping prolong engine life and reduce maintenance intervals. Direct replacement part sized for 70 mm bore engines, simplifying repairs and minimizing downtime. Key attributes Function: Replacement piston ring for sealing combustion gases and regulating oil on the piston. Compatibility: Fits Yanmar 19 70 mm bore diesel motor generator; suitable for Chinese 170F 70 mm bore diesel engine generator. Size: Designed for a 70 mm cylinder bore. Condition: Replacement part intended for service, repair, or rebuild applications. How it solves common problems Worn or damaged piston rings cause loss of compression, hard starting, loss of power, increased oil consumption and smoke. Replacing the piston ring restores proper sealing and engine performance. A properly sized ring reduces the risk of cylinder scoring and premature wear when installed correctly. Typical applications / use scenarios Repair a Yanmar 19 diesel motor generator with low compression readings to restore power and efficiency. Replace a worn piston ring during routine rebuild or maintenance on a Chinese 170F 70 mm bore diesel engine generator. Use as a spare part kept on hand by field service technicians for quick repair of small diesel generator sets. Installation and compatibility notes Confirm the engine bore measures 70 mm before installation. Intended as a direct replacement for the listed models; verify part fit against the piston and cylinder specifications on your engine manual. Professional installation or experienced mechanical service is recommended to ensure correct ring orientation, end-gap, and torque settings. Reliable replacement for routine maintenance and emergency repairs on compatible 70 mm bore diesel generators.