Product Description
Interstate-McBee M-3802421 Piston Ring Set – STD – 1989–1998 5.9L Cummins 12-Valve
Quality aftermarket standard-size piston ring set (STD) for the 5.9L Cummins 12-valve (6BT) found in 1989–1998 Dodge Ram 2500/3500. Built to OE-equivalent specs for dependable sealing, oil control, and long service life.
- OE-style performance: Restores proper compression and oil control.
- Standard size (STD): For standard bore cylinders; not for oversize bores.
- Durable construction: Designed for diesel duty cycles and heat loads.
- Interstate-McBee quality: Trusted components for Cummins rebuilds.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3802421 |
| Size | Standard (STD) |
| Engine | Cummins 5.9L 12-valve (6BT) |
| Applications | 1989–1998 Dodge Ram 2500/3500 and other B-Series platforms using the 6BT |
| Position | Piston compression/oil control rings |
| Sold As | Set for one piston (order quantity 6 for a complete engine) |
What’s Included
- (1) Complete ring pack for a single piston (compression and oil control rings)
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with 5.9L Cummins 12-valve (6BT)
- Model Years: 1989–1998
- Additional Cummins B-Series applications using the 6BT where M-3802421 (STD) is specified
Recommended/Related Parts
- Pistons (STD or oversize to match your bore)
- Rod and main bearing sets
- Full gasket set or head gasket
- Valve stem seals and valve train components
Install Notes
- Measure cylinder bores and confirm standard size before ordering; hone as required.
- Check ring end-gap in the bore and file-fit if necessary per the service manual.
- Observe ring orientation and staggering of ring gaps during installation.
- Use proper ring compressors and lubrication; follow Cummins torque and procedure specs.
FAQ
Is this the right size for my engine?
This set is STD (standard bore). If your block has been bored oversize, choose the matching oversize ring set. When in doubt, verify by ESN and bore measurement.
How many sets do I need?
Each set services one piston. A complete 6-cylinder engine typically requires 6 sets.
Will this fit 24-valve (1998.5–2002) 5.9L engines?
No. This listing is for the 12-valve 6BT only.
Why Buy From CPP Diesel
- ESN-verified fitment help from diesel specialists
- Fast shipping and easy returns
- Great pricing on Interstate-McBee and complementary Cummins parts
