Mahle 41940 Engine Piston Ring Set

Overview

Mahle 41940 is a premium engine piston ring set built for Ford Super Duty gas applications that require standard bore sizing and OE-focused ring design. It combines low-friction ring technology with materials selected to control oil use and support long service life.

Fits 2003-2010 Ford E-350 Super Duty, E-450 Super Duty, F-250 Super Duty, F-350 Super Duty, F-450 Super Duty, F-550 Super Duty, E-350 Club Wagon, and Excursion, engine set.

Key Features

• Standard bore diameter of 3.7402 in for confirmed engine applications.
• Plasma-moly face coating for improved ring surface durability and reduced friction.
• Carbon steel top ring with cast iron second and oil ring assemblies.
• Premium-grade construction for engine rebuild and overhaul work.
• Engineered to reduce oil consumption while maintaining ring sealing performance.

Product Details

Mahle 41940 piston rings are built around OE requirements and focus on friction reduction, lower ring mass, and controlled oil consumption. The ring package uses a carbon steel top ring with plasma-moly facing, plus cast iron second and oil ring components, giving the assembly the material mix needed for consistent cylinder sealing in Ford E-350 Super Duty, F-250 Super Duty, and related Super Duty applications. The 3.7402-inch bore diameter and standard oversize specification make this part suitable for engines that remain within factory bore dimensions. This part cross-references Hastings Piston Rings (e.g., 2C5374) for the same application.

Common Uses

• Restoring cylinder sealing during an engine rebuild.
• Addressing oil consumption caused by worn ring packs.
• Replacing rings with worn face coatings or reduced tension.
• Supporting compression recovery in high-mileage Ford truck engines.

Installation Notes

Verify bore diameter, ring thickness, and cylinder condition before installation. Match the ring set to the engine specification listed for the vehicle and confirm ring end gaps during assembly. Clean the cylinder walls thoroughly and follow the engine builder’s installation procedure for ring orientation and break-in.

Quality Assurance

Mahle piston rings are developed to OE requirements and use advanced ring materials and coatings to support durability, reduced friction, and controlled oil use.