MAHLE 42140.04 PISTON RING SET (.040) FOR 07.5-18 CUMMINS 6.7

Product Description

MAHLE 42140.04 (.040 over) piston ring set is built to OE specs for 2007.5–2018 6.7L Cummins (ISB, 24-valve) overbore rebuilds. Plasma-moly face top ring, precise axial heights, and controlled tension deliver reliable sealing, stable compression, and long service life in daily, tow, and work-truck duty.

MAHLE 42140.04 piston ring set, S42140.040, 6.7 Cummins .040 rings, plasma moly top ring, Ram 2500 3500 4500 5500 2007.5-2018, overbore 4.250, diesel rebuild parts, GTIN 027067854704

Fitment

• 2007.5–2018 Ram 2500/3500/4500/5500 with 6.7L Cummins ISB (24V), engines bored to +0.040" (final bore approx. 4.250")
• Single-cylinder ring pack — order 6 sets for a complete engine.

Cross-Reference / IDs

• MAHLE: S42140.040 (aka 42140.04 / 42140.040)
• Typical OE references: consult your piston/ring spec sheet for final end-gap

Recommended MAHLE Pairings (Internal Links)

• MAHLE S42140 Piston Ring Set – Standard Bore 6.7L (2007.5–2018)
• MAHLE S42140.020 Piston Ring Set – +0.020" Over
• MAHLE 224-3732WR.040 Piston Set w/ Rings – +0.040"
• MAHLE 224-3732WR Piston Set w/ Rings – Standard Bore

Why MAHLE

• OE-grade materials with plasma-moly face for wear resistance
• Consistent ring geometry for proper groove conformity and seal
• Trusted in stock rebuilds and high-mileage fleet service

Installation Notes

• Confirm finished bore and set end-gaps per build spec
• Use correct ring orientation; install with a properly sized compressor
• Hone finish and plateau per piston/ring manufacturer recommendations

FAQ

Is 42140.04 sold per cylinder or as a full engine set?

Per cylinder. Order six (6) for a complete 6.7L Cummins.

What bore size does .040 over correspond to?

Approximately 4.250" final bore when the block is bored +0.040" over standard.

Will these fit all 2007.5–2018 6.7L Cummins engines?

Yes, when the engine is bored to +0.040". Always measure the finished bore and verify ring end-gaps.