MAHLE 42097.030 Plasma-Moly Piston Ring Set Oversize - 030

The MAHLE 42097.030 is a premium plasma-moly piston ring set machined to +0.030" oversize for the Ford 6.4L Power Stroke diesel and Navistar MaxxForce 7 engines. Engineered by MAHLE as an Original Equipment supplier, this set is built to the same standards that define OE specifications — not merely meet them.

Ring Construction & Materials:

• Upper Compression Ring (UCR): Carbon steel with plasma-moly facing — barrel-faced contact area for efficient sealing and reduced break-in time
• Lower Compression Ring (LCR): Ductile iron with reverse-twist design for improved groove side sealing and taper-race machining for enhanced contact
• Oil Control Ring (OCR): Cast iron with chrome facing — CP-20 assembly with 20° ear angle for maximum side seal against the cylinder wall, plus chemically polished expander for optimized oil drain-back

Key Specifications:

• Oversize: +0.030" (~+0.76 mm)
• Axial Heights: UCR 2.5mm / LCR 2.0mm / OCR 3.0mm
• Ring Types: UCR — RFK-13PF | LCR — RBT-17 | OCR — GCL-40URW
• Sold as a single-cylinder set; order 8 sets for a complete 8-cylinder engine build

Key Features:

• Pre-lapped from the factory — seats immediately, virtually eliminating extended break-in time
• Ring tension, materials, and coatings optimized for reduced friction and extended service life
• CNC-controlled gap chamfer minimizes blow-by and maximizes compression retention
• Backed by MAHLE's industry-leading 2-year / 200,000-mile warranty

Whether you're performing a full short-block rebuild or replacing rings on a single cylinder, the MAHLE 42097.030 delivers OE-grade precision and durability for high-demand diesel applications.