Mahle 41240CP Engine Piston Ring Set

Engine Piston Ring Set Overview

Mahle 41240CP is a premium engine piston ring set built for standard bore applications with a 4.000-inch bore diameter. It combines carbon steel, cast iron, and stainless steel ring materials with a plasma-moly face coating to support controlled oil use and reduced friction.

Fits 1977-1980 Pontiac Sunbird, N/A. Fits 1977-1978 Pontiac Phoenix, N/A. Fits 1977 Pontiac Astre, N/A. Fits 1977 Pontiac Ventura, N/A. Fits 1978-1980 Chevrolet Monza, N/A. Fits 1980 American Motors Concord, N/A. Fits 1980 American Motors Spirit, N/A. Fits 1980 Jeep CJ5, N/A. Fits 1980 Jeep CJ7, N/A. Fits 1978-1980 Oldsmobile Starfire, N/A.

Key Features

• Standard 4.000-inch bore diameter for matched engine rebuild applications.
• Premium-grade ring set with a plasma-moly top ring face coating.
• Top ring in carbon steel, second ring in cast iron, and oil ring assembly in stainless steel.
• Designed to reduce friction, control oil consumption, and extend service life.
• Fits a range of 1977-1980 Pontiac, Chevrolet, Oldsmobile, American Motors, and Jeep engines.

Detailed Description

Mahle 41240CP piston rings are engineered around OE-level requirements and focus on low friction, reduced ring mass, and oil control. The ring package uses a carbon steel top ring with plasma-moly facing, a cast iron second ring, and a stainless steel oil ring assembly to support consistent sealing and wear resistance in standard bore engine builds. This part cross-references Hastings Piston Rings (e.g., 2M5570, PES5570) for the same application.

For buyers searching for a Mahle piston ring set for Pontiac Sunbird, Chevrolet Monza, or Jeep CJ7 engine rebuilds, 41240CP provides a direct fitment match across the listed 1977-1980 applications. The 41240CP part number is also useful when comparing replacement options for standard bore service work.

Common Problems This Part Can Address

• Excessive oil consumption from worn or tired ring packs.
• Loss of cylinder sealing during engine rebuilds.
• Higher friction from outdated ring materials or worn faces.
• Reduced compression caused by ring wear.
• Need for a standard bore replacement ring set during overhaul work.

Installation Notes and Tips

Confirm bore size before installation; this set is specified for a 4.000-inch standard bore. Match the ring package to the cylinder finish and follow the engine builder’s ring gap and break-in procedures for the application. Verify the listed fitment for your exact year, make, and model before assembly.

Quality Assurance

Mahle positions this piston ring set as a premium component developed to OE requirements, with emphasis on friction reduction, oil control, and service life. The 41240CP part number reflects a technical replacement option for rebuilders who need consistent ring materials and coating selection.