Product Description
Interstate-McBee M-4089258 Piston Ring Set – Standard Bore (04.5–07 5.9L Cummins)
OE-style standard bore piston ring set from Interstate-McBee for late-2004 (04.5) through 2007 5.9L Cummins ISB common-rail engines. Each set services one piston; order six (6) sets for a complete engine. Designed for factory bore cylinders that do not require oversize machining.
- Direct-fit replacement: Matches Cummins 4089258 application for ISB/QSB platforms.
- STD bore: For unbored cylinders (nominal 4.020" / 102.0 mm).
- Per-piston packaging: One set per cylinder streamlines service; buy 6 for full engine.
- Aftermarket value: Interstate-McBee quality at a lower cost than OE-boxed rings.
Specifications
| Brand | Interstate-McBee |
|---|---|
| McBee Part # | M-4089258 (Standard Bore) |
| OEM Reference | Cummins 4089258 (ISB/QSB) |
| Additional Cross-References | 3947678, 3947871, 4025012, 4089137, 4089138, 4089948 |
| Bore Size | STD (nominal 4.020" / 102.0 mm) |
| Contents (per set) | Top ring, second ring, oil control ring assembly for one piston |
| Sold As | 1 set per piston (order qty 6 for complete engine) |
| Engine Family | Cummins ISB 5.9L common-rail (late-2004–2007) |
Vehicle Fitment
Fitment can vary by CPL/ESN—verify by engine serial number (ESN) for best results.
- Dodge Ram 2500/3500 – 5.9L Cummins ISB (Common Rail)
- Model years: 2004.5–2007 (late-2004 HO update through 2007)
- Industrial: Select Cummins ISB/QSB 5.9L applications (ESN confirmation required).
Note: Some early 2003–2004 common-rail engines use a different ring set. Confirm by ESN before ordering.
Install Tips
- Measure cylinder taper/out-of-round; standard bore rings are not a fix for worn cylinders.
- Always check and set ring end-gaps per Cummins service specifications.
- Stagger ring gaps as specified; clean ring lands thoroughly before installation.
Why Buy From CPP Diesel
- ESN-verified fitment support from real diesel techs
- Fast shipping, hassle-free returns
- Matched add-ons: ring compressor, head & gasket kits, pistons
FAQ
How many sets do I need for a full 5.9L engine?Six. Each M-4089258 package covers one piston; purchase 6 sets for all cylinders.
Will these fit my 2003–early 2004 truck?
Possibly not. The 4089258 application is typically for 2004.5–2007 ISB. Check your ESN/CPL to confirm.
What is “standard bore”?
Factory cylinder diameter (approx. 4.020"/102.0 mm) with no oversize machining. If cylinders are worn, use the appropriate oversize components.
Do these rings require filing?
Yes—measure and file ring end-gaps per the Cummins service manual for your CPL.
Product Videos
Custom Field
YEAR 2003-2007
MAKE DODGE
ENGINE 5.9L
