Product Description
Interstate-McBee M-4089181 Piston Ring Set (.020 / 0.50 mm) – 03–07 5.9L Cummins
OE-quality .020" (0.50 mm) oversize piston ring set engineered for 2003–2007 5.9L Cummins ISB (24-valve common-rail) engines. Ideal for overbore rebuilds, restoring compression and oil control with OEM-style materials and profiles.
- Direct application: Built for 03–07 Dodge Ram 2500/3500 5.9L Cummins ISB.
- .020" / 0.50 mm oversize: For properly bored/honed cylinders—verify bore size before install.
- Engineered to OEM spec: Ring geometry and tension designed to maintain factory performance.
- Aftermarket value: Interstate-McBee quality at a fraction of OEM boxed pricing.
Specifications
| Interstate-McBee Part | M-4089181 |
|---|---|
| OEM Reference | Cummins 4089181 |
| Size | .020" oversize (0.50 mm) |
| Application | 5.9L Cummins ISB 24V (common-rail) |
| Years | 2003–2007 |
| What’s Included | Ring pack for one piston (top compression, second compression, oil ring assembly) |
| Warranty | Manufacturer coverage; typical Interstate-McBee new parts warranty up to 24 months from installation |
Vehicle Fitment
Always confirm by engine serial number (ESN) for precise compatibility.
- Dodge Ram 2500/3500 with 5.9L Cummins ISB (24V common-rail):
- Model Years: 2003, 2004, 2005, 2006, 2007
- Industrial: Select Cummins ISB/QSB 5.9 applications (verify by ESN)
Install Notes
- Quantity: One set services one piston—order 6 sets for a complete engine.
- Bore/Hone: Confirm cylinders are bored/honed to .020" over; measure ring end-gap per service manual.
- Orientation: Observe top ring markings and stagger ring gaps as specified by Cummins.
- Break-in: Use appropriate oil and follow manufacturer break-in procedure.
Related / Cross-References
- Standard bore: Interstate-McBee M-4089258
- .040" over (1.00 mm): Interstate-McBee M-4089182
- OEM reference: Cummins 4089181
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping and easy returns
- Curated 5.9/6.7 Cummins rebuild parts to complete your job
FAQ
Will these rings fit my 2003–2007 5.9L Cummins?Yes—this set is listed for 2003–2007 Dodge Ram 5.9L Cummins ISB (24-valve common-rail). Always verify by ESN.
Is .020" the same as 0.50 mm?
Practically, yes. .020" equals 0.508 mm, commonly rounded and cataloged as 0.50 mm oversize.
How many sets do I need?
One ring set services one piston. For a complete 6-cylinder engine, order six sets.
Does this include pistons?
No—this listing is for the piston rings only. Pistons and pins are sold separately.
