This piston ring is a Genuine Yanmar part for the 4TNV98 industrial diesel engine, supplied under Manufacturer Part Number 129907-22051. Built from a high-grade, wear‐resistant ferrous alloy, it is designed to seal the combustion chamber, maintain compression, regulate oil control, and assist heat transfer from the piston to the cylinder wall. By restoring tight sealing and reducing blow-by, it supports efficient fuel combustion and stable power output. Suitable for service and overhaul work on machinery powered by the Yanmar 4TNV98, it helps keep engines running reliably in demanding construction, agricultural, and power-generation settings. Precision manufacture to Yanmar’s specification ensures a correct fit and dependable performance when installed with the proper orientation and end gap.

Key Features:
– Genuine Yanmar component for assured compatibility with the 4TNV98
– Helps restore and maintain cylinder compression for efficient combustion
– Wear‐resistant alloy for long service life in harsh operating conditions
– Precision geometry for stable sealing and reduced blow‐by
– Supports correct oil control to limit oil consumption and exhaust smoke
– Heat‐transfer function aids piston cooling and longevity
– Consistent performance across a wide temperature and load range
– Made to OEM specification to match original ring clearances and profiles
– Straightforward to fit during routine rebuilds or in-frame servicing when using correct tools and procedures

Typical Applications:
Used during engine rebuilds, mid‐life overhauls, and repairs on equipment powered by Yanmar 4TNV98 engines. Typical examples include compact construction machinery, agricultural implements, generator sets, pumps, and compressors where restoring compression, lowering oil usage, and improving starting and performance are required.

Also known as:
Piston sealing ring, ring pack component, bore sealing ring, top ring/second ring (generic terms), oil control ring (contextual term), cylinder sealing ring, engine piston ring.

Fits Models:
4TNV98

Alternate Part Numbers:
129907-22051, 12990722051, 1299022051

Product Specifications