Product Description
MAHLE 42140.04 (.040 over) piston ring set for the 2007.5–2018 6.7L Cummins 24-valve. Designed to OE specs with plasma-moly face coating for durability and sealing performance. Sold per cylinder (qty 1 = rings for one piston).
- Bore Size: 4.250" (+.040") for overbore rebuilds
- Construction: OE-quality rings with plasma-moly face coating
- Format: Single-cylinder ring set — order 6 for full engine
Fitment
- 2007.5–2018 Dodge/Ram 2500, 3500, 4500, 5500 with 6.7L Cummins (24V)
Cross Reference / IDs
- MPN: S42140.040 (aka 42140.04 / 42140.040)
- GTIN/UPC: 027067854704
- Also referenced as: Clevite/MAHLE 42140.040
FAQ
Is this the correct size for my build?
Use these when your block is bored to 4.250" (+.040"). Measure the finished bore — do not rely only on model year.
How many sets do I need?
This is a single-cylinder ring set. You’ll need six (6) for a complete 6.7L Cummins.
Will it fit 2007.5–2018 Rams?
Yes, for 6.7L Cummins (24-valve) applications when the engine is bored +.040".
What are the ring materials?
OE-quality rings with a plasma-moly face for wear resistance; top ring ductile iron, second ring cast iron, two-piece oil ring.
Any install tips?
Check end-gaps to spec for your application; use proper ring compressor sized to 4.250".
