Product Description
Interstate-McBee M-3800784 Piston Kit .020 Over – 98.5–02 5.9L Cummins (Standard Output)
Restore factory performance on your 1998.5–2002 5.9L Cummins 24-Valve (Standard Output) with this OEM-style .020" (0.50 mm) oversize piston kit from Interstate-McBee. Built to OEM dimensions for reliable sealing, durability, and drop-in compatibility when your block is bored .020" over.
- Engineered to OEM spec: Matches Cummins geometry and ring groove dimensions for proper sealing.
- .020" (0.50 mm) oversize: For cylinders bored/honed .020" over standard.
- Complete kit per cylinder: Piston, ring set, wrist pin, and pin retainers—sold individually.
- Aftermarket value: Interstate-McBee quality at significant savings versus OEM-boxed parts.
Specifications
| Interstate-McBee Part # | M-3800784 |
|---|---|
| OEM Reference | Cummins 3800784 |
| Oversize | .020" (0.50 mm) |
| Engine Family | Cummins ISB 5.9L 24-Valve (B-Series) |
| Sold | Individually (quantity 6 required for a full set) |
| Included | Piston, piston ring set, wrist pin, pin retainers |
Vehicle Fitment
Always verify fitment by engine serial number (ESN) if possible.
- Dodge Ram 2500/3500 – 5.9L Cummins 24-Valve (Standard Output)
- Model Years: 1998.5–2002
- Important: Intended for Standard Output applications. Some 2001–2002 trucks were High Output (NV5600); verify with ESN/parts data before ordering.
Cross-References & Options
- Standard bore: M-3800781 (per cylinder)
- .020" over: M-3800784 (this listing)
- .040" over: M-3800785 (per cylinder)
- OEM reference: Cummins 3800784
Installation Notes
- Confirm machine work to .020" (0.50 mm) oversize and maintain proper piston-to-wall clearance.
- Check ring end gaps and orientation per Cummins service procedures.
- Cleanliness is critical—thoroughly wash bores after honing to remove abrasive residue.
Warranty
Interstate-McBee new engine components carry manufacturer warranty coverage. For terms and claim procedure, contact us with your ESN and order details.
Why Buy From CPP Diesel
- ESN-verified fitment support to avoid returns and downtime
- Fast shipping, secure packaging, and hassle-free returns
- Real diesel techs available by phone or chat
FAQ
What does .020" (0.50 mm) oversize mean?It means your block has been bored/honed .020" larger than standard. This kit matches that new bore size and restores correct piston-to-wall clearance and ring seal.
Is this for Standard Output or High Output engines?
This listing targets the Standard Output 5.9L ISB (1998.5–2002). Some 2001–2002 trucks were HO; verify via ESN or parts catalog if you have an HO truck before ordering.
What comes in each piston kit?
One cylinder’s worth: piston, ring set, wrist pin, and pin retainers. Order six kits for a complete engine.
Do rings arrive pre-gapped?
No. Always check and set ring end gaps to specification during assembly. Follow the Cummins service manual for your ESN.
Product Videos
Custom Field
YEAR 1998.5-2002
MAKE DODGE
ENGINE 5.9L
