Product Description
MAHLE S42170.040 piston ring set delivers OE-grade sealing for rebuilt 1989–2007 5.9L Cummins engines after a +.040" overbore (approx. 4.055"). Engineered ring geometry and chrome-faced compression rings help restore compression, minimize blow-by, and control oil in tow rigs, work trucks, and daily drivers.
Fitment
- 1989–2007 Dodge Ram 2500/3500 with 5.9L Cummins (12-valve & 24-valve) when finished bore is +.040" (≈4.055") and ring pack matches piston design.
- Sold per cylinder; order 6 sets to service a complete engine.
Cross-Reference / Alternatives (Mahle only)
- MAHLE S42170 (Standard Bore) – 1989–2007 5.9L
- MAHLE S42170.020 (+.020") – 1989–2007 5.9L
- MAHLE 224-3673WR.040 Piston Kit w/ Rings – 2004.5–2007 5.9L (Set of 6)
What’s Included
- Complete ring pack for one piston: top compression, second ring, and oil control assembly.
Install Notes
- Confirm finished bore (+.040") and piston groove specs before install; file-fit end gaps per Cummins/Mahle spec.
- Use an appropriate 4.055" ring compressor; orient gaps per service manual.
FAQ
Is this a full engine set?
No. Each S42170.040 services one cylinder. Order six sets for all six pistons.
Will S42170.040 fit my year?
It’s commonly used across 1989–2007 5.9L Cummins engines that are bored +.040". Always match to piston design and finished bore.
What’s the finished bore size?
Approximately 4.055" (+.040" over standard 4.016").
Specifications for Mahle S42170.040
| Attribute | Value |
|---|---|
| Brand | MAHLE / Clevite |
| Part Number | S42170.040 |
| UPC (GTIN-12) | 027067878335 |
| Bore Size | 4.055" (+.040") |
| Set Format | Single-cylinder ring pack (order 6 for full engine) |
| Shipping Info | Shipping calculated at checkout; package approx. 4.25" W × 4.25" D × 2.00" H. |
| Prop 65 | This product can expose you to chemicals including lead/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. |
