Product Description
Interstate-McBee M-4089976 Piston Kit — .020" Oversize (0.50 mm) — 2003–2004 5.9L Cummins 24-Valve
Aftermarket replacement piston kit engineered for the 2003–2004 Dodge Ram 2500/3500 with the 5.9L Cummins common-rail (24-valve). The .020" oversize is intended for blocks that have been bored and honed to the corresponding service dimension. Each kit services one (1) cylinder.
- Oversize: .020" (0.50 mm)
- Application: 5.9L Cummins, model years 2003–2004 (24-valve common-rail)
- Quality: Interstate-McBee aftermarket replacement; OE-style form, fit, and function
- Use case: Ideal for rebuilds requiring a first-oversize piston after machining
What’s Included
- (1) Piston — .020" oversize
- (1) Piston ring set — matched to oversize
- (1) Piston pin (gudgeon pin/wrist pin)
- (2) Pin retainers/clips
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4089976 |
| OEM Reference | Cummins 4089976 (kit reference) |
| Oversize | .020" / 0.50 mm |
| Engine | 5.9L Cummins (24-valve common-rail), 2003–2004 |
| Sold As | Kit for one cylinder (order quantity 6 for full engine) |
| Position | Short block / rotating assembly |
Vehicle Fitment
Verify by engine serial number (ESN) and piston bowl/part marking when possible.
- Dodge Ram 2500/3500 with 5.9L Cummins common-rail (24-valve)
- Model Years: 2003–2004
Recommended / Related Parts
- Rod bearing set (size to match crankshaft)
- Main bearing set (size to match crankshaft)
- Full gasket set (upper & lower)
- Oil pump and pickup tube seal
- Cylinder head bolts or studs
- Coolant, break-in oil, assembly lube
Install Notes
- Machine work required: .020" oversize pistons are for blocks bored & honed to the correct service dimension and surface finish; always measure with proper metrology.
- Check piston-to-wall clearance, ring end gaps, and pin fit per service manual specs.
- Verify piston orientation (bowl/markings/arrow) and connecting rod offset before installation.
- Clean ring grooves and ensure rings are installed in the correct order and orientation.
- Follow Cummins service procedures for torque values and angle turns; lubricate fasteners as specified.
FAQ
How many kits do I need?
Each kit services one cylinder. Order six (6) kits for a complete engine rebuild.
Will this fit my 1998.5–2002 or 2004.5–2007 5.9L?
This listing targets 2003–2004 common-rail engines. Other years may require different bowl designs or compression ratios—verify by ESN and piston markings.
Do rings come pre-gapped?
No. Rings are supplied to be file-fit/checked. Always measure and set ring end gaps to the service spec for your application.
