Product Description
Interstate-McBee M-3800785 Piston Kit .040 (1.00 mm) – 98.5–02 5.9L Cummins Standard Output
Restore compression and reliability on your 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins (24-valve, Standard Output) with this OEM-style .040 in / 1.00 mm oversize piston kit from Interstate-McBee. Each kit is engineered for factory-match fit and durability on ISB 5.9 applications.
- Oversize for rebuilds: .040 in (1.00 mm) to match common machine shop overbores.
- Complete single-cylinder kit: Includes piston, ring set, wrist pin, and pin retainers (order qty 6 for a full engine).
- OEM-equivalent performance: Matches OE spec for form, fit, and function.
- Aftermarket value: Interstate-McBee quality at a lower cost than genuine OEM.
Specifications
| Interstate-McBee P/N | M-3800785 |
|---|---|
| OE Cross-Reference | Cummins 3800785 |
| Oversize | .040 in (1.00 mm) |
| Includes | Piston, ring set, wrist pin, pin retainers |
| Sold As | Single cylinder kit — order 6 per engine |
| Engine Family | Cummins B/ISB 5.9L (24-valve, Standard Output) |
Vehicle Fitment
Always verify by engine serial number (ESN) and build details.
- Dodge Ram 2500/3500 — 5.9L Cummins ISB 24-Valve (Standard Output)
- Model Years: 1998.5, 1999, 2000, 2001, 2002
- Note: For Standard Output engines. Not typically used on 2001.5–2002 HO (NV5600) applications.
Install Notes
- Confirm machine shop bore size; measure piston-to-wall clearance per Cummins service manual.
- Check ring end gap and orientation; verify piston protrusion and deck height.
- Lubricate wrist pin/bore; torque fasteners to spec and follow break-in procedures.
Cross-References & Related
- OE: Cummins 3800785 (ISB 5.9 piston kit, 1.00 mm over)
- Other sizes: Interstate-McBee M-3800781 (STD), M-3800784 (.020 / 0.50 mm)
- Ring sets (if purchased separately): M-3802423 (.040), M-3804990 (STD)
Why Buy From CPP Diesel
- Diesel experts with ESN-verified fitment support
- Fast shipping and hassle-free returns
- Huge in-stock selection of 2nd-Gen Cummins rebuild parts
FAQ
What does “.040 / 1.00 mm oversize” mean?It indicates the piston is sized for a cylinder that’s been bored 0.040" (≈1.00 mm) over stock to clean up wear or damage. Machine the block accordingly and confirm clearances during assembly.
Is this kit for Standard Output or High Output engines?
This listing is for Standard Output (SO) 24-valve ISB engines used from 1998.5–2002. HO variants (2001.5–2002 NV5600) may require different piston specs. Verify by ESN before ordering.
What’s included in one “piston kit”?
One cylinder’s components: piston, ring set, wrist pin, and pin retainers. Order six (6) to service a full engine.
Do I need special rings for .040 over?
The included ring set matches the .040 oversize. If buying rings separately, select a .040 / 1.00 mm set for your application.
Product Videos
Custom Field
YEAR 1998.5-2002
MAKE DODGE
ENGINE 5.9L
