Product Description
Interstate-McBee M-3800785 Piston Kit – .040" Over (≈1.0 mm) — 1998.5–2002 5.9L Cummins 24-Valve ISB
Quality aftermarket replacement piston kit for the 1998.5–2002 Dodge Ram 2500/3500 equipped with the 5.9L Cummins 24-valve ISB (VP44). Oversize .040" (≈1.0 mm) for engines requiring machine work. Sold individually; order quantity 6 for a complete engine set.
- Precision fit: .040" (≈1.0 mm) oversize for rebuilt blocks honed/bored to spec.
- Durable build: Interstate-McBee quality for reliable service life.
- Complete kit: Includes piston, rings, wrist pin, and pin retainers.
- OEM-style performance: Designed to meet factory form, fit, and function.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3800785 |
| Oversize | .040" (≈1.0 mm) over |
| Engine | 5.9L Cummins ISB (24-valve, VP44) |
| Years | 1998.5–2002 (Dodge Ram 2500/3500) |
| Sold As | Each (1 cylinder) |
| Qty Required | 6 pistons for complete engine |
| Kit Contents | (1) Piston, (1) Ring set, (1) Wrist pin, (2) Pin retainers |
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins ISB 24-valve (1998.5–2002)
- May fit additional ISB applications where .040" over pistons are specified (confirm by ESN and service data).
What’s Included
- (1) Interstate-McBee piston, .040" over
- (1) Piston ring set (matched to oversize)
- (1) Wrist pin
- (2) Pin retainers/locks
Install Notes
- Block must be bored and honed to the correct oversize with proper finish; measure each cylinder.
- Check piston-to-wall clearance, ring side clearance, and ring end gap per Cummins service manual.
- Verify piston orientation (markings/reliefs) and piston protrusion before selecting head gasket thickness.
- Clean ring grooves, oil passages, and bores thoroughly; use assembly lube as specified.
- Torque fasteners to spec and follow the OEM break-in procedure.
Recommended/Related Parts
- Complete engine gasket set / head gasket (select thickness after measuring protrusion)
- Rod and main bearing sets
- Piston cooling nozzles (inspect/replace as needed)
- Timing components and front/rear seals
- Oil pump and water pump (inspect while engine is apart)
Why Buy From CPP Diesel
- ESN-verified fitment help from diesel specialists
- Fast shipping and easy returns
- Great pricing on Cummins ISB rebuild components
FAQ
How many piston kits do I need?
Order 6 kits for a complete 6-cylinder engine.
Is .040" the same as 1.0 mm?
.040" is approximately 1.0 mm. Always machine and measure to the exact spec listed by the piston manufacturer.
Will this fit my 12-valve (1989–1998)?
No. This listing is for 24-valve ISB (1998.5–2002). Use the correct pistons for 12-valve 6BT engines.
