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.
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.
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | 42140.04 / S42140.040 |
| UPC GTIN | 027067854704 |
| Shipping Info | Ships from CPP Diesel; shipping calculated at checkout. Typical package approx. 4.25" W × 4.25" D × 2.00" H. |
| Country of Origin | Not specified |
| Prop 65 | This product can expose you to chemicals including lead and lead compounds, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov. |