Mahle 41904CP Engine Piston Ring Set

Engine Piston Ring Set Overview

Mahle 41904CP is a premium engine piston ring set built to OE-driven standards for controlled friction, reduced oil consumption, and long service life. It is sized for a standard 3.917-inch bore and uses a three-ring design with material and coating choices aimed at stable sealing and wear resistance.

Key Features

• Standard bore diameter: 3.917 inches
• Plasma-moly face coating for improved wear resistance
• Top ring made from carbon steel for strength and heat handling
• Second ring made from cast iron for dependable sealing
• Oil ring assembly uses stainless steel with a shallow groove design
• Premium-grade construction for engine rebuild applications

Detailed Description

The Mahle 41904CP piston ring set combines a 1.50 mm top ring, 1.50 mm second ring, and 3.00 mm oil ring assembly to match the specified standard-bore application. The plasma-moly coated face helps reduce friction at the cylinder wall, while the stainless steel oil ring assembly and shallow groove design support oil control. This part cross-references Hastings Piston Rings (e.g., 2M5097) and Sealed Power (e.g., E975K) for the same application. It is a direct-fit option for rebuilds on Jeep Grand Cherokee, Dodge Ram 1500, and Chrysler 300 applications listed in the fitment data, and it also covers other compatible Jeep, Dodge, and Chrysler models in the same range. Mahle 41904CP is engineered for engines that need consistent ring sealing, controlled oil use, and durable operation under rebuild conditions.

Common Uses

• Excessive oil consumption from worn piston rings
• Low compression caused by ring wear or loss of seal
• Blue exhaust smoke related to oil control issues
• Reduced cylinder sealing during engine rebuilds
• Restoring ring function after high-mileage engine wear

Installation Notes and Tips

Verify bore size, ring thickness, and groove dimensions before installation. Clean the piston ring grooves thoroughly and confirm end gap specifications during assembly. Follow the engine builder’s procedures for ring orientation, cylinder preparation, and break-in.

Quality Assurance

Mahle designs piston rings to OE requirements, with an emphasis on reduced friction, lower oil consumption, and extended service life. The 41904CP reflects premium ring technology intended for professional engine rebuild work.