Product Description
Interstate-McBee M-4089669 Piston Kit – Standard Bore – 04.5–07 5.9L Cummins 24V
OE-style aftermarket standard-bore piston kit purpose-built for the 2004.5–2007 Dodge Ram 2500/3500 with 5.9L Cummins 24-valve (ISB) common-rail. Precision components deliver reliable sealing and durability under heavy-duty use. Sold individually — order (6) kits for a complete engine set.
- Direct-fit replacement: Matches OEM Cummins 4089669 dimensions and performance.
- Complete kit: Includes piston, ring set, wrist pin, and pin retainers for straightforward assembly.
- Standard bore: 102 mm (4.016 in) for stock cylinder size; oversizes available separately.
- Aftermarket value: Interstate-McBee quality at a price point far below OEM boxed parts.
Specifications
| Interstate-McBee P/N | M-4089669 |
|---|---|
| OEM Cross-Reference | Cummins 4089669 (STD) |
| Bore Size | Standard 102 mm (4.016 in) |
| Kit Contents | Piston, ring set, wrist pin, pin retainers |
| Oversize Options | .020 in (M-4089670) • .040 in (M-4089671) |
| Common Cross-Refs | 3966678, 3970192, M-4089669 |
| Sold As | Each (6 required per engine) |
Vehicle Fitment
Always verify by Engine Serial Number (ESN) for non-truck or industrial applications.
- Dodge Ram 2500/3500 — 2004.5, 2005, 2006, 2007 — 5.9L Cummins 24V ISB (common rail)
- Additional use: Select ISB/QSB 5.9 non-certified engines (ESN verification required)
Installation Notes
- Confirm cylinder size and finish; measure ring end-gap and piston-to-wall per Cummins spec.
- Observe pin orientation and bowl alignment; verify squish and protrusion.
- Follow the Cummins service manual for torque specs, clearances, and ring positioning.
Warranty
New Interstate-McBee engine parts are typically covered for 24 months from installation (valvetrain components may be 12 months). Contact us for current policy details.
Related/Recommended
- Piston Rings (STD): Interstate-McBee M-4089258
- Oversize Pistons: M-4089670 (.020), M-4089671 (.040)
- Main & rod bearings, head set, and in-chassis gasket set for full rebuilds
Why Buy From CPP Diesel
- Diesel-focused fitment expertise for Cummins B-series platforms
- Fast shipping and easy returns
- Real tech support—ESN verification available
FAQ
Is this piston kit sold individually?Yes. Each kit is one cylinder. Six (6) kits are needed for a complete engine.
What’s included in the kit?
Piston, ring set, wrist pin, and pin retainers for each cylinder.
Will this fit early 2003–2004 5.9L common-rail engines?
No. Early 2003–2004 CR applications use a different piston (e.g., STD M-4089950). Verify by ESN.
Are oversize pistons available?
Yes: .020 in (M-4089670) and .040 in (M-4089671) for properly bored/honed cylinders.
What is the standard bore size?
102 mm (4.016 in) is the standard bore for the 5.9L Cummins B-series.
Product Videos
Custom Field
YEAR 2004.5-2007
MAKE DODGE
ENGINE 5.9L
