Product Description
Interstate-McBee M-4089671 Piston Kit – .040" Over (2004.5–2007 5.9L Cummins Common Rail)
Quality aftermarket piston kit for the mid-year 2004.5 through 2007 5.9L Cummins common-rail (ISB). The .040" oversize (≈1.00 mm) is ideal for engines requiring an overbore during rebuild. Sold per cylinder.
- Oversize: .040" over (≈1.00 mm) for bores machined accordingly
- Complete kit: Piston, ring set, wrist pin, and retaining clips
- Direct replacement: Designed to meet OE form, fit, and function
- Reliable choice: Interstate-McBee quality for everyday and work truck builds
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4089671 |
| Application | 5.9L Cummins ISB (Common Rail), mid-2004.5–2007 |
| Oversize | .040" (≈1.00 mm) |
| Sold As | Each (1 piston kit per cylinder) |
| Qty Required | 6 kits for a full engine set |
| Includes | Piston, ring set, wrist pin, retaining clips |
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins Common Rail (ISB)
- Model Years: 2004.5, 2005, 2006, 2007 (through 2007 production of 5.9L)
- Does not fit: Early 2003–early 2004 5.9L (pre-2004.5), 1998.5–2002 24-valve, or 2007.5+ 6.7L engines.
What’s Included
- (1) Piston
- (1) Matched piston ring set
- (1) Wrist pin
- (2) Pin retaining clips
Recommended/Related Parts
- Additional (5) piston kits for complete engine set
- Head gasket set & head bolts/studs
- Main & rod bearing sets
- Oil pump, timing cover gasket, front/rear main seals
- Injector sealing washers & fuel system service items
Install Notes
- Machine work required: Block must be bored and honed to the correct .040" over size with proper finish; measure piston-to-wall clearance per spec.
- Check ring end gap: File-fit as needed; stagger gaps per standard practice.
- Orientation: Verify piston “FRONT” marking and bowl orientation during assembly.
- Use assembly lube, torque fasteners to spec, and follow the Cummins service manual.
FAQ
How many kits do I need?
Six piston kits are required for a complete 5.9L engine.
Will these fit my 2004 truck?
This kit fits the 2004.5 and newer 5.9L common-rail only. If your truck is early 2004 or 2003, verify the ESN or contact us to confirm.
Do I need machine work?
Yes. .040" over pistons require an overbore and proper hone to match piston-to-wall clearance and ring seating requirements.
Why Buy From CPP Diesel
- Diesel specialists with ESN-verified fitment support
- Fast shipping and easy returns
- Competitive pricing on full rebuild bundles
