Product Description
Interstate-McBee M-4089950 Piston Kit, Standard (STD) — 2003–2004 5.9L Cummins 24-Valve, 305 HP
Quality aftermarket replacement piston kit engineered for the 2003–2004 Dodge Ram 2500/3500 with the 5.9L Cummins common-rail (24-valve) rated at 305 horsepower. Built to OE-equivalent form, fit, and function for reliable rebuilds and service work.
- Direct replacement: Matches OE dimensions and crown/bowl style for listed applications.
- Complete kit: Includes piston, ring set, wrist pin, and pin retainers—ready for assembly.
- Standard bore: STD (standard) size for use with in-spec cylinders or after proper honing.
- Interstate-McBee quality: Proven components that deliver consistent performance and value.
What’s Included
- (1) Piston — STD
- (1) Piston ring set — STD
- (1) Wrist (gudgeon) pin
- (2) Pin retainers/locks
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4089950 |
| Size | STD (Standard) |
| Engine | 5.9L Cummins 24-Valve, Common-Rail (ISB/6BTA variant) |
| Model Years | 2003–2004 (305 HP calibration) |
| Sold As | Each (1 cylinder) |
| Qty Required | 6 kits per engine (one per cylinder) |
Vehicle Fitment
Always verify by engine serial number (ESN) or CPL before ordering.
- Dodge Ram 2500/3500 — 5.9L Cummins common-rail (24-valve), 2003–2004, 305 HP
- Other ISB applications using the same piston/bowl code and OE reference (verify by ESN/CPL).
Notes & Tips
- Sizing: This is a STD kit. If your cylinders are worn beyond spec, use the correct oversize (e.g., +.50 mm) instead of STD.
- Machine work: Measure bores, hone to finish, and set skirt clearance to spec. Thoroughly clean bores after honing.
- Ring gaps: File-fit/check ring end gaps to the service manual; stagger ring gaps on install.
- Oil jets: Inspect piston cooling nozzles for damage/blockage and verify alignment.
- Bowl/code matching: Match piston bowl and part code to your ESN/CPL for correct compression and emissions calibration.
Frequently Asked Questions
How many do I need?
You’ll need six (6) kits for a complete engine—one per cylinder. This item is priced and sold individually.
Does the kit include rings and wrist pin?
Yes. Each kit includes the piston, full ring set, wrist pin, and pin retainers.
Will this fit all 2003–2004 5.9L Cummins?
It is commonly used on 305 HP 2003–2004 common-rail engines. Because Cummins used multiple CPLs and bowl codes, always verify by ESN/CPL before purchase.
Can I use STD if my cylinder is worn?
No. If the cylinder measures out of spec, choose the appropriate oversize and perform the required machine work.
Why Buy From CPP Diesel
- ESN/CPL verification help from diesel specialists
- Fast shipping and easy returns
- Huge selection of Cummins internal engine parts
