Product Description
Cummins 3802423 OEM Piston Ring Set (.040 Over) – Ram 5.9L 12V/24V (1989-2002)
The Cummins 3802423 OEM Piston Ring Set (.040 Over) is a genuine Cummins replacement ring package designed for rebuilding 5.9L B-Series diesel engines found in Dodge Ram trucks from 1989 through 2002. Manufactured to Cummins OEM specifications, this piston ring set provides proper sealing, oil control, compression retention, and long-term durability for street, towing, work truck, and performance engine rebuilds.
Designed for engines utilizing .040-inch oversize pistons, the Cummins 3802423 ring set helps restore cylinder sealing and combustion efficiency while reducing blow-by and oil consumption. Whether you're rebuilding a legendary 12-valve Cummins or a 24-valve ISB engine, genuine Cummins components ensure proper fit, performance, and reliability.
Features
- Genuine Cummins OEM piston ring set
- Designed for .040-inch oversize pistons
- Restores compression and combustion sealing
- Helps reduce oil consumption and blow-by
- Manufactured to Cummins factory specifications
- Engineered for long service life and durability
- Ideal for complete engine rebuilds and overhauls
- Maintains proper oil control and ring sealing performance
- Direct replacement for worn or damaged piston rings
- Trusted OEM quality for work, towing, and performance applications
Fitment
- 1989-2002 Dodge Ram 2500 5.9L Cummins Diesel
- 1989-2002 Dodge Ram 3500 5.9L Cummins Diesel
- 1989-1998 5.9L 12-Valve Cummins Engines
- 1998.5-2002 5.9L 24-Valve Cummins Engines
- 5.9L Cummins B-Series Engine Rebuilds
- 5.9L Cummins ISB Engine Rebuilds
- Engines utilizing .040-inch oversize pistons
Note: This ring set is designed for engines using .040-inch oversize pistons. Verify piston size and engine specifications before ordering.
What's Included
- Cummins 3802423 OEM Piston Ring Set
- Compression Rings
- Oil Control Rings
- Ring Expander Components as Required
Specifications
- Manufacturer: Cummins
- Part Number: 3802423
- Product Type: OEM Piston Ring Set
- Oversize: .040 Inch Over
- Engine Platform: 5.9L Cummins B-Series
- Engine Compatibility: 12-Valve and 24-Valve Cummins
- Fuel Type: Diesel
- Material: OEM Cummins Ring Materials
- Application: Engine Rebuild and Overhaul
- Fitment Years: 1989-2002
- Engine Displacement: 5.9L (359 Cubic Inch)
- Installation Location: Pistons
- OEM Replacement: Yes
Cross Reference Numbers
3802423, Cummins 3802423, 5.9 Cummins .040 Over Ring Set, 12V Cummins Piston Rings, 24V Cummins Piston Rings, B-Series Cummins Ring Set
FAQ
What does .040 over mean?
.040 over indicates the engine block has been machined and fitted with pistons that are 0.040 inch larger than standard bore size. This ring set is specifically designed for those oversize pistons.
Will this fit both 12-valve and 24-valve Cummins engines?
Yes. The Cummins 3802423 ring set is commonly used in 5.9L 12-valve and 24-valve engine rebuilds when .040-inch oversize pistons are installed.
Are these genuine Cummins piston rings?
Yes. This is a genuine Cummins OEM piston ring set manufactured to factory specifications for proper fit and performance.
Can I use these rings with standard bore pistons?
No. This ring set is designed specifically for .040-inch oversize pistons and should not be used with standard bore pistons.
Why choose OEM Cummins piston rings?
OEM Cummins piston rings are engineered to provide proper sealing, oil control, durability, and long-term reliability while meeting factory performance standards.
When should piston rings be replaced?
Piston rings are commonly replaced during engine rebuilds, overhauls, or when excessive blow-by, oil consumption, low compression, or cylinder wear is present.
