Product Description
Interstate-McBee M-4089671 Piston Kit .040 Over – 2004.5–2007 5.9L Cummins
OEM-style .040 in / 1.00 mm oversize piston kit engineered for the 2004.5–2007 Dodge Ram 2500/3500 5.9L Cummins (24-valve ISB common-rail). Built for durability and precise fit in over-bore rebuilds. Sold individually—order six for a full engine set.
- Exact-fit aftermarket replacement: Direct cross to Cummins 4089671 (.040 / 1.00 mm).
- Complete per-cylinder kit: Piston, piston ring set, wrist pin, and pin retainers.
- Quality materials & machining: Designed to meet OEM form/fit/function for reliable sealing and longevity.
- Cost-effective: Interstate-McBee quality at a fraction of OEM boxed pricing.
Specifications
| Brand / Part | Interstate-McBee M-4089671 |
|---|---|
| OEM Reference | Cummins 4089671 (.040 / 1.00 mm) |
| Oversize | .040 in (1.00 mm) |
| Sold | Individually (qty 6 required per engine) |
| Includes | Piston, ring set, wrist pin, retainers (circlips) |
| Engine | 5.9L ISB 24-valve common-rail |
| Related OEM Sizes | 4089669 (STD), 4089670 (.020 / 0.50 mm) |
Vehicle Fitment
Always verify using engine serial number (ESN) and build date.
- Dodge Ram 2500 / 3500 – 5.9L Cummins 24V ISB (Common-Rail)
- Model Years: 2004.5, 2005, 2006, 2007 (mid-year 2004.5 split)
Install Notes
- Measure cylinder bores and confirm required oversize; hone or bore per spec.
- Check ring end-gap in-cylinder; install rings per orientation marks.
- Verify piston protrusion, bearing clearances, and torque fasteners to Cummins service manual specs.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists.
- Fast shipping, easy returns, and expert tech help.
- One-stop pairing with head gaskets, bearings, and in-frame kits.
FAQ
Is this the right piston for my 2004 truck?This kit fits the 2004.5 (mid-year split) through 2007 5.9L common-rail engines. If your 2004 is an early build, contact us with your ESN to confirm.
What’s included in each “piston kit”?
One cylinder’s parts: piston, ring set, wrist pin, and pin retainers. Order six kits for a complete engine.
Is .040 the same as 1.00 mm?
Yes—.040 inch overbore equals 1.00 mm oversize. Machine work must match this size.
Do I need to balance or match components?
Use matched sets, confirm weights within spec, and follow Cummins procedures for piston/rod assembly and orientation.
Do you offer STD or .020 options?
Yes—STD and .020 (0.50 mm) are available in related part numbers. Ask for availability so we can match your block’s condition.
Product Videos
Custom Field
YEAR 2004.5-2007
MAKE DODGE
ENGINE 5.9L
