Product Description
Interstate-McBee M-3802422 Piston Ring Set — .020" Over (0.50 mm) — 1989–2002 5.9L Cummins
Quality aftermarket piston ring set from Interstate-McBee for the 5.9L Cummins B-Series. Sized .020" over (0.50 mm) for engines using matching oversize pistons after machining/honing. Sold per cylinder (one piston).
- Correct oversize: .020" (0.50 mm) for properly bored/honed cylinders.
- Broad fitment: Works with 1989–1998 12-valve and 1998.5–2002 24-valve 5.9L Cummins when .020" pistons are used.
- Reliable seal: Designed to restore compression and oil control when rebuilding.
- Service friendly: Packaged for one piston; order six sets for a full engine.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3802422 |
| OEM Reference | Cummins 3802422 |
| Size | .020" over (0.50 mm) |
| Sold As | Set for one piston (1 cylinder) |
| Engine | 5.9L Cummins B-Series (6BT/ISB) |
| Qty Required (Full Engine) | 6 sets (one per cylinder) |
What’s Included
- (1) Complete piston ring set for a single piston (compression and oil control rings)
Vehicle / Engine Fitment
Verify by engine serial number (ESN) and matching piston size.
- Dodge Ram 2500/3500 with 5.9L Cummins:
- 12-Valve: 1989–1998
- 24-Valve: 1998.5–2002
- Other B-Series 5.9L applications using .020" oversize pistons
Installation Notes
- Use with correctly bored and plateau-honed cylinders for .020" oversize pistons.
- Check ring end gap in the bore and adjust carefully to the service manual specification.
- Confirm ring orientation and groove cleanliness; do not mix rings between cylinders.
- Follow Cummins torque specs and break-in procedures after assembly.
Recommended/Related Parts
- Matching .020" oversize pistons (set of 6)
- Full engine gasket set / head gasket
- Main/rod bearings and thrust washers
- Hone stones, ring filer, assembly lube
FAQ
Is this a complete engine set?
No—this listing is per cylinder. Order a quantity of 6 for a complete 6-cylinder engine.
Will these fit standard-size pistons?
No. These are .020" (0.50 mm) oversize and must be used with .020" oversize pistons and a properly machined block.
Does this fit both 12-valve and 24-valve 5.9L?
Yes—so long as the engine uses .020" oversize pistons and ring specs match the build. Always verify by ESN.
