Mahle 42089CP Engine Piston Ring Set

Engine Piston Ring Set for Chrysler, Dodge, Jeep Vehicles

The Mahle 42089CP engine piston ring set is designed for reliable performance in select Chrysler, Dodge, and Jeep models. Engineered with premium materials and precise dimensions, this piston ring set supports efficient combustion and oil control for engines with a 4.0551 inch bore diameter.

• Premium item grade for durability and performance
• Top ring made of ductile iron with 0.0586 inch axial height
• Second ring constructed from carbon steel, 0.0586 inch thickness
• Oil ring assembly crafted from stainless steel with 0.1181 inch axial height
• Plasma-moly coating on piston ring face for wear resistance
• Standard piston ring oversize with shallow groove size

Technical Details and Material Composition

This Mahle piston ring set (part number 42089CP) features a combination of materials optimized for engine longevity and performance. The top ring is made from ductile iron, providing strength and flexibility under high combustion pressures. The second ring uses carbon steel to assist in scraping excess oil and maintaining compression. The oil ring assembly is stainless steel, ensuring corrosion resistance and effective oil control. The plasma-moly coating on the piston ring face reduces wear and friction, contributing to engine efficiency. The rings are designed for a bore diameter of 4.0551 inches and fit engines with a standard oversize and shallow groove configuration.

Compatible Vehicles and Applications

This piston ring set is compatible with various Chrysler, Dodge, and Jeep models, including:

• Chrysler 300
• Dodge Challenger
• Dodge Charger
• Jeep Grand Cherokee
• Dodge Magnum

It is intended for use in engine rebuilds or repairs requiring replacement of piston rings to restore proper compression and oil control.

Common Engine Issues Addressed

• Reduced engine compression causing power loss
• Excessive oil consumption or oil burning
• Increased blow-by gases affecting emissions
• Engine noise due to worn or damaged piston rings
• Poor fuel efficiency related to ring wear

Installation Notes and Tips

Ensure the cylinder bore diameter matches the 4.0551 inch specification before installation. Proper ring orientation and gap clearance are critical for optimal performance. Use appropriate ring compressors and follow manufacturer torque specifications during piston installation. Inspect cylinder walls for wear or damage prior to fitting new rings.

Quality Assurance and Warranty

Mahle piston rings are manufactured to meet strict quality standards for material composition and dimensional accuracy. The 42089CP piston ring set undergoes rigorous testing to ensure durability and performance in demanding engine conditions. Warranty coverage details should be confirmed with the original equipment manufacturer or authorized distributor.