Mahle 42140 Engine Piston Ring Set

Mahle 42140 Piston Ring Set for Ram and Dodge

The Mahle 42140 engine piston ring set is built for select Ram 2500, Ram 3500, Ram 4000, and Dodge Ram 2500/3500 applications with standard bore sizing. It combines premium ring materials with low-friction face treatment to support consistent sealing, oil control, and long service life in demanding diesel engine use.

Key Features

• Standard bore diameter: 4.2126 in.
• Premium-grade piston ring set for engine rebuild service
• Top ring material: ductile iron for strength and durability
• Second ring material: cast iron
• Oil ring assembly material: cast iron with 2 pc. groove type
• Plasma-Moly piston ring face coating for reduced friction
• Top ring thickness: 0.113 in.
• Second ring thickness: 0.0984 in.
• Oil ring assembly thickness: 0.1356 in.
• Cross-reference: Hastings Piston Rings 2M5872

Detailed Description

Mahle 42140 is an engine piston ring set engineered around OE-driven requirements for friction control, oil consumption management, and service life. The ring package uses a ductile iron top ring, cast iron second ring, and cast iron oil ring assembly with a Plasma-Moly face coating to support stable cylinder sealing and controlled oil film behavior. For diesel rebuilds in Ram and Dodge Ram trucks, this combination is selected to match standard bore service needs while maintaining the dimensional consistency expected in cylinder block component work. This part number, 42140, is a direct fitment-focused choice for rebuilders working on Ram 2500, Ram 3500, Ram 4000, and Dodge Ram 2500/3500 engines within the listed years.

What It Helps Address

• Excessive oil consumption from worn or tired piston rings
• Loss of cylinder sealing that can affect compression
• Reduced ring performance caused by heat and wear
• Engine rebuild needs on standard-bore Ram and Dodge Ram diesel applications
• Friction-related wear in high-load engine operation

Installation Notes and Tips

Verify bore diameter, ring groove dimensions, and engine code before installation. Clean piston ring grooves thoroughly, check end gaps to the engine builder’s specifications, and confirm ring orientation during assembly. Because fitment varies by engine configuration, match the vehicle application exactly before ordering Mahle 42140 for Ram 2500, Ram 3500, or Dodge Ram 2500/3500 service.

Quality Assurance

Mahle piston rings are developed to meet OE-level engineering expectations for friction reduction, ring mass control, oil consumption management, and long service life. Mahle 42140 reflects that approach with premium materials and a performance-focused ring face coating for rebuild applications.

Compatible Vehicles

• Fits 2011-2017 Ram 2500, N/A; Size Standard; Material Grade Premium; Material UCR-Ductile Iron; LCR-Cast Iron; OCR-Cast Iron; Facing UCR-Plasma-Moly; OCR-Chrome; Axial Height UCR-2.87mm; LCR-2.5mm; OCR-3.45mm; Ring Type UCR:RFK-18PF; LCR:RBT-10; OCR: GCL-40URW; Engine Set
• Fits 2011-2017 Ram 3500, N/A; Size Standard; Material Grade Premium; Material UCR-Ductile Iron; LCR-Cast Iron; OCR-Cast Iron; Facing UCR-Plasma-Moly; OCR-Chrome; Axial Height UCR-2.87mm; LCR-2.5mm; OCR-3.45mm; Ring Type UCR:RFK-18PF; LCR:RBT-10; OCR: GCL-40URW; Engine Set
• Fits 2011-2013 Ram 4000, N/A; Size Standard; Material Grade Premium; Material UCR-Ductile Iron; LCR-Cast Iron; OCR-Cast Iron; Facing UCR-Plasma-Moly; OCR-Chrome; Axial Height UCR-2.87mm; LCR-2.5mm; OCR-3.45mm; Ring Type UCR:RFK-18PF; LCR:RBT-10; OCR: GCL-40URW; Engine Set
• Fits 2007-2010 Dodge Ram 2500, N/A; Size Standard; Material Grade Premium; Material UCR-Ductile Iron; LCR-Cast Iron; OCR-Cast Iron; Facing UCR-Plasma-Moly; OCR-Chrome; Axial Height UCR-2.87mm; LCR-2.5mm; OCR-3.45mm; Ring Type UCR:RFK-18PF; LCR:RBT-10; OCR: GCL-40URW; Engine Set
• Fits 2007-2010 Dodge Ram 3500, N/A; Size Standard; Material Grade Premium; Material UCR-Ductile Iron; LCR-Cast Iron; OCR-Cast Iron; Facing UCR-Plasma-Moly; OCR-Chrome; Axial Height UCR-2.87mm; LCR-2.5mm; OCR-3.45mm; Ring Type UCR:RFK-18PF; LCR:RBT-10; OCR: GCL-40URW; Engine Set