Product Description
MAHLE 224-3732.040 piston set is the +0.040" oversize replacement for the 2007.5–2018 6.7L Cummins ISB. MAHLE’s expansion-controlled design and compensated ring grooves help maintain correct ring loading, reduce noise/wear, and control oil consumption. Sold as a complete set of six pistons with rings for an inline-6 rebuild.
- Oversize: +0.040" (≈1.00 mm)
- Application: 2007.5–2018 Ram HD with 6.7L Cummins ISB (24-valve common-rail)
- Construction: Lightweight aluminum piston, non-coated skirt, includes new rings
- Typical ring grooves: 3.0 mm / 2.0 mm / 3.0 mm
- GTIN/UPC: 639789311375
Fitment
- 2007.5, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ram 2500/3500/4500/5500 with 6.7L ISB (verify by VIN/ESN)
Cross Reference Numbers
- Cummins: 4376349 (.040" over), 4376348 (.020"), 4376347 (standard)
- MAHLE Rings: S42140.04 (.040" ring set)
What’s Included
Six MAHLE pistons (.040" oversize) with rings (compression & oil), wrist pins, and clips. Non-coated skirt version.
FAQ
Is this priced per piston or per set?
XDP lists pricing per piston. For a complete 6.7L rebuild you need six pistons (set pricing shown here reflects qty 6).
What bore size does .040" correspond to?
A typical 6.7L Cummins standard bore is ~4.213"; .040" over pistons target about 4.253" final bore (machine and measure to spec).
Will these fit all 2007.5–2018 6.7L trucks?
They’re designed for the 6.7L ISB in Ram HD; always confirm by VIN/engine serial number, especially across calibration years.
Are the skirts coated?
This listing is the non-coated skirt version MAHLE offers for the 6.7L.
Which ring set crosses to .040"?
MAHLE S42140.04 is the .040" ring set commonly paired with these pistons.
