Mahle S42104.030 Engine Piston Ring Set

Mahle Engine Piston Ring Set for Ford HD Applications

The Mahle S42104.030 engine piston ring set is a premium oversize ring package for select 1994 Ford F-250 and Ford F-350 heavy-duty applications. Built to OE-driven standards, it focuses on reduced friction, controlled oil consumption, and long service life in a 4.140-inch bore.

Key Features

• Part number S42104.030 for 0.030 in oversize applications
• 4.140 in bore diameter
• Premium item grade for engine rebuild use
• Top ring material: ductile iron
• Second ring material: ductile iron
• Oil ring assembly material: cast iron
• Plasma-Moly ring face coating for improved wear resistance
• Compatible With 1994 Ford F-250 and 1994 Ford F-350, HD application

Detailed Description

Mahle S42104.030 is an engine piston ring set engineered for rebuilds that require a 0.030 in oversize fit in a 4.140 in bore. The ring package uses ductile iron for the top and second rings, cast iron for the oil ring assembly, and a plasma-moly face coating to support stable sealing and wear control. This configuration is suited to heavy-duty Ford engine service where ring seal, oil control, and durability matter. If you are sourcing piston rings for a 1994 Ford F-250 or 1994 Ford F-350, this Mahle set matches the listed HD application details and ring dimensions.

This part cross-references no listed alternate part numbers in the provided data.

Common Problems This Part Addresses

• Excessive oil consumption from worn or tired piston rings
• Loss of cylinder sealing that can reduce compression
• Ring wear from high-mileage or rebuilt engine service
• Scuffing or accelerated wear in rebuild applications
• Need for an oversize ring set during engine machining

Installation Notes and Tips

Confirm bore size, ring groove dimensions, and oversize requirements before assembly. Match the ring set to the machined cylinder bore and verify end gaps during engine build. Clean ring grooves thoroughly and follow the engine builder’s specifications for ring orientation and break-in procedures. For 1994 Ford F-250 and Ford F-350 rebuilds, verify that the engine configuration matches the listed HD application before installation.

Quality Assurance

Mahle designs piston rings around OE requirements, with attention to friction reduction, ring mass control, oil consumption management, and service life. The S42104.030 reflects that engineering approach for engine rebuild applications requiring precise ring fit and durable sealing performance.