Mahle 42263 Engine Piston Ring Set

Engine piston ring set overview

Mahle 42263 is a premium engine piston ring set built for standard-bore applications with a 2.9528 in bore diameter. It is listed for Toyota Prius and Toyota Yaris applications from 2006-2009, with ring materials and coatings selected to reduce friction and support longer service life.

Key features

• Premium-grade piston ring set for engine cylinder block service.
• Standard oversize specification with a 2.9528 in bore diameter.
• Top ring uses stainless steel for durability in the combustion chamber.
• Second ring uses carbon steel for controlled sealing performance.
• Oil ring assembly uses a 2-piece groove design with GNS material and coating.
• Fits 2006-2009 Toyota Prius, N/A.
• Fits 2006-2009 Toyota Yaris, N/A.

Detailed description

Mahle 42263 piston rings are engineered around OE requirements, with a focus on lowering friction, reducing ring mass, and limiting engine oil consumption. The ring package combines a stainless steel top ring, carbon steel second ring, and GNS-treated oil ring components to support consistent sealing and wear control. For Toyota Prius and Toyota Yaris engines in the listed 2006-2009 applications, this part number 42263 provides a direct service option for standard-bore rebuild work.

This part cross-references Hastings Piston Rings (e.g., 2C5091) for the same application.

What this part is used for

• Restoring cylinder sealing after ring wear.
• Addressing oil consumption caused by worn ring packs.
• Improving compression retention in rebuild service.
• Replacing rings during standard-bore engine overhaul work.

Installation notes and tips

Verify bore diameter, ring end gap, and groove dimensions before assembly. Match the ring set to the engine specification shown in the fitment data for Toyota Prius and Toyota Yaris applications. Clean piston grooves thoroughly and inspect cylinder walls before installation. Part number 42263 should be confirmed against the engine build sheet or original ring specification before final assembly.

Quality assurance

Mahle designs piston rings to OE requirements and emphasizes reduced friction, lower ring mass, and extended service life. The premium material mix and coating strategy reflect that engineering focus.