Product Description
CUMMINS 3802423 OEM PISTON RING SET (.040 OVER) – RAM 5.9L 12V/24V (1989–2002)
The genuine CUMMINS 3802423 OEM piston ring set (.040 over) is the factory-correct oversize ring package required when rebuilding a worn 5.9L Cummins engine. Whether you are restoring a high-mileage 12-valve or freshening up a 24-valve ISB, these rings deliver OEM sealing performance, durability, and heat resistance far beyond aftermarket copies. Hidden performance tags ensure this page ranks for oversize Cummins rebuild components without cluttering the description.
This set fits oversize (.040 / 1.00mm) pistons used in 1989–2002 5.9L Cummins engines, including VE, P7100, VP44, and ISB variants. Each ring set is engineered for proper cylinder sealing, reduced blow-by, and long-term reliability—critical for stock trucks, tow rigs, work trucks, and performance builds alike.
Pair this ring set with other genuine Cummins components to complete your overhaul, including matching pistons, bearings, and gaskets. CPP Diesel stocks only verified 100% genuine OEM Cummins parts—never aftermarket substitutions.
Key Features
- Genuine Cummins OEM piston ring set – not aftermarket.
- .040” oversize for overbored cylinders.
- Fits both 12-valve (1989–1998) and 24-valve (1998.5–2002) 5.9L Cummins engines.
- Factory metallurgy and coatings for maximum cylinder sealing.
- Critical for high-boost or towing engines that demand perfect ring seal.
Fitment Details
- Engine: 5.9L Cummins B-Series (6BT / ISB)
- Valve Configurations: 12-Valve (1989–1998), 24-Valve VP44 ISB (1998.5–2002)
- Oversize: .040" over / 1.00mm
- Applications: Performance builds, full overhauls, machine shop rebuilds, work/tow engines
Always verify oversize requirements with your machine shop before ordering.
Cross-Reference & Companion Cummins Parts
These genuine Cummins components pair perfectly with the 3802423 piston ring set for a complete rebuild:
- CUMMINS 3802648 STANDARD PISTON RING SET
- CUMMINS 3907167 OEM PISTON ASSEMBLY
- CUMMINS 3802070 MAIN BEARING SET
- CUMMINS 3802150 ROD BEARING SET
Common cross-reference identifiers: 3802423, 3802423-040, 3802423RX (reman), 3802150 (related bearings), 3804896 (related ring families).
Specifications for cummins 3802423
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3802423 |
| Oversize | .040" Over / 1.00mm Oversize |
| Engine Compatibility | 5.9L Cummins B-Series 12V & 24V (1989–2002) |
| Vehicle Fitment | 1989–2002 Ram 2500/3500 with 5.9L Cummins |
| UPC | 760914023492 |
| GTIN | 00760914023492 |
| Cross Reference | 3802423-040, 3802423RX, 3802150 (bearing family), 3804896 (ring variants) |
| E-Codes / Emissions | Used across 6BT/ISB emissions families; verify per ESN. |
| Shipping Weight | Approx. 0.9 lb |
| Typical Shipping Method | Standard ground; expedited options available |
| Prop 65 Warning | WARNING: This product may expose you to chemicals including combustion byproducts and machining oils known to the State of California to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
Frequently Asked Questions
WILL THESE .040" OVER RINGS FIT MY 5.9L CUMMINS?
Yes—if your block has been bored .040" oversize. Oversize must be verified by your machine shop. These fit all 1989–2002 5.9L Cummins variants.
ARE THESE RINGS GENUINE CUMMINS AND NOT AFTERMARKET?
Yes. CPP Diesel sells only 100% genuine Cummins OEM ring sets for this part number.
CAN I USE THESE RINGS WITH ANY BRAND OF PISTON?
These rings are engineered primarily for OEM Cummins pistons. They may fit other brands if the groove dimensions match OEM spec—confirm with your machine shop.
DO THESE WORK FOR BOTH 12-VALVE AND 24-VALVE 5.9L ENGINES?
Yes. This ring set is compatible with 12V (1989–1998) and 24V VP44 ISB (1998.5–2002) engines.
WHAT OTHER PARTS SHOULD I REPLACE DURING A REBUILD?
We strongly recommend pistons, main bearings, rod bearings, and a complete gasket set. See the Cummins OEM components linked above.
