Product Description
Interstate-McBee M-4089670 Piston Kit — .020" Oversized (0.50 mm) — 2004.5–2007 5.9L Cummins
Quality aftermarket piston kit engineered for the 2004.5–2007 Dodge Ram 2500/3500 with the 5.9L Cummins 24-valve common-rail engine. The +0.020" (0.50 mm) oversize is designed for blocks that are being rebored and honed. Sold individually (kit services one cylinder).
- Precise oversize: +0.020" (0.50 mm) for rebuilt blocks.
- Complete kit: Includes piston, ring set, wrist pin, and pin retainers/clips.
- Durability: Interstate-McBee quality for OE-equivalent fit and function.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4089670 |
| Size / Oversize | +0.020" (0.50 mm) |
| Configuration | Piston kit (one cylinder) |
| Includes | Piston, piston rings, wrist pin, pin clips |
| Sold As | Each (order qty 6 for a complete engine) |
| Engine | 5.9L Cummins 24-valve Common-Rail (ISB/6B) |
| Model Years | 2004.5–2007 (Mid-2004 split; verify by VIN/ESN) |
What’s Included
- (1) Oversize piston (+0.020" / 0.50 mm)
- (1) Piston ring set matched to piston
- (1) Wrist pin
- (2) Pin retainers/clips
Vehicle Fitment
Always verify by engine serial number (ESN) and measure existing bore before ordering.
- Dodge Ram 2500/3500 — 5.9L Cummins 24-valve common-rail
- Years: 2004.5, 2005, 2006, 2007 (to model-year changeover)
Install Notes
- Machine work required: Block must be bored and honed to the specified oversize with proper surface finish for ring seating.
- Measure piston-to-wall clearance and ring end gaps; set per service manual.
- Verify piston orientation (markings/reliefs) and connecting rod compatibility.
- Use clean engine oil or assembly lube on pins; torque fasteners to spec.
Tips
- Order six kits for a full engine.
- Consider new rod bearings, main bearings, head gasket set, and oil pump during overhaul.
- If mixing sizes (e.g., some cylinders standard, others oversize), clearly label each cylinder during assembly.
Why Buy From CPP Diesel
- Diesel-specialist support and ESN-verified fitment help
- Fast shipping and competitive pricing
- Deep inventory of complementary Cummins rebuild parts
FAQ
Is this a complete engine set?
No. Each kit services one cylinder. Order quantity 6 for a full set.
Do I need machine work for .020" oversize?
Yes. The block must be bored and honed to 0.50 mm (0.020") oversize with the correct finish.
Will this fit early 2004 trucks?
Only mid-year 2004.5 and newer (common-rail). For early-2004/non-CR setups, verify by ESN before ordering.
