Mahle 42246.010 Complete MaxxForce 7 / 6.4L Power Stroke .010" Piston Ring Set

Complete 8-cylinder .010" oversize piston ring set for 2008–2010 Ford 6.4L Power Stroke and Navistar MaxxForce 7 engines. Built for high cylinder pressure, heat, and heavy-duty use.

What’s included

• Complete ring set for all 8 pistons
• .010" oversize (approximately 0.25 mm)
• Typical ring pack: 2.5 mm top / 2.0 mm second / 2.5 mm oil (confirm against your pistons)

Key features

• Pre-lapped rings for faster seating after a proper hone
• Steel top ring with premium wear-resistant facing
• Cast iron second ring for oil control and groove sealing
• Stainless steel oil ring for consistent oil control
• Designed to reduce blow-by and oil consumption versus worn stock rings
• Mahle quality used by professional diesel rebuilders

Fitment

• 2008–2010 Ford F-250, F-350, F-450, and F-550 Super Duty with 6.4L Power Stroke (VIN R)
• Navistar / International MaxxForce 7 6.4L applications
• Intended for matching Mahle MaxxForce 7 pistons or equivalent aftermarket pistons with the same groove dimensions

Important notes

• These rings are made for the Mahle 42246 / MaxxForce 7 piston design
• Not a universal replacement for every OEM Ford 6.4 ring pack
• Confirm piston part number, groove width, and finished bore before ordering
• Professional machining and installation recommended
• File or verify ring end gaps to spec during assembly

A complete, correctly sized .010" ring set for a 6.4L Power Stroke or MaxxForce 7 rebuild using Mahle-style pistons.