Product Description
Refresh cylinder sealing on your B-series with the MAHLE S42170 Standard-Bore Piston Ring Set for the 1989–2007 Cummins 5.9L (12-valve & 24-valve). Engineered to OE form/fit/function with chrome-faced compression for durability and a Napier-style second ring for oil control, this single-cylinder set restores compression, reduces blow-by, and keeps oil where it belongs.
Fitment
- 1989–2007 Dodge Ram 2500 / 3500 — 5.9L Cummins (12-valve & 24-valve), standard 4.016" bore. Verify piston design and bore size before ordering.
Cross-Reference / Alternatives (Mahle only)
- Mahle S42170.020 Piston Ring Set (.020" over): S42170.020
- Mahle S42170.040 Piston Ring Set (.040" over): S42170.040
- Mahle S42221 Piston Ring Set (Std) — early 5.9L coverage: S42221
What’s Included
- One (1) complete standard-size ring set for a single piston (top, second, oil ring assembly). Order six sets for a complete engine.
Why CPP Diesel
- Fast fulfillment and diesel-focused support
- Deep Mahle coverage for Cummins platforms
FAQ
Will these fit every 5.9L Cummins?
Covers standard 4.016" bore B-series 5.9L (1989–2007). Always confirm bore size and piston ring land style before purchase.
How many sets do I need for a full rebuild?
This is a single-cylinder set. You’ll need six sets for a complete engine.
Do I need to file-fit the rings?
Yes. File-fit ring end gaps to your builder’s spec based on bore, usage, and expected temps/boost.
What are common oversizes?
Mahle offers popular oversizes like .020" and .040" (see Cross-Reference above).
Specifications for Mahle S42170
| Attribute | Value |
|---|---|
| Brand | Mahle |
| Part Number | S42170 (Standard Bore) |
| UPC | 027067878311 |
| GTIN | 027067878311 |
| Engine Compatibility | 1989–2007 Cummins 5.9L (12V & 24V), standard 4.016" bore |
| Package Dimensions | Approx. 5.00" × 1.00" × 5.00" |
| Shipping | Calculated at Checkout |
| Prop 65 | Not specified by manufacturer. See www.P65Warnings.ca.gov. |
