MAHLE S42097.010 Engine Piston Ring Set +0.010" Oversized Single Cylinder

The MAHLE S42097.010 is an OE-quality, +0.010" oversized piston ring set engineered for the Ford 6.4L Power Stroke diesel engine. Designed to meet or exceed original equipment specifications, this single-cylinder ring set delivers reliable compression, superior oil control, and long-lasting durability for engine rebuilds requiring a 0.010" overbore.

MAHLE is one of the world's largest OE piston ring manufacturers, and the S42097 series is built with premium materials and precision engineering to restore factory performance. The ring set is pre-lapped for immediate seating, virtually eliminating break-in time and ensuring a fast, reliable installation.

Ring Construction & Materials:

• Upper Compression Ring (UCR): Carbon steel construction with Plasma-Moly facing for reduced friction and enhanced wear resistance
• Lower Compression Ring (LCR): Ductile iron construction with reverse twist design for improved groove side sealing
• Oil Control Ring (OCR): Cast iron with chrome facing; CP-20 design featuring a 20-degree ear angle for optimal cylinder wall side sealing and improved oil drain back

Ring Specifications:

• Size: +0.010" Oversized
• UCR Axial Height: 2.5mm
• LCR Axial Height: 2.0mm
• OCR Axial Height: 3.0mm
• Ring Types: UCR – RFK-13PF | LCR – RBT-17 | OCR – GCL-40URW
• Fuel Type: Diesel

Key Features:

• Pre-lapped for immediate seating — virtually eliminates break-in time
• Plasma-Moly top ring reduces friction and maximizes ring life
• CNC-controlled gap chamfer on compression rings optimizes compression and reduces blow-by
• Intermediate ring reverse twist design enhances groove side sealing
• SAE 9254 high-alloy steel base material provides higher tensile strength, fatigue resistance, and material hardness
• Covers a single cylinder — order quantity 8 for a complete 8-cylinder engine set

The MAHLE S42097.010 is the ideal choice for engine builders seeking OE-level quality and precision fit during a 6.4L Power Stroke diesel rebuild. Also compatible with select Navistar MaxxForce 7 applications.