Product Description
CUMMINS 3804990 OEM PISTON RING SET (STANDARD) – ISB 5.9L 24V (1998.5–2002)
The genuine CUMMINS 3804990 OEM piston ring set is the correct standard-size ring kit for 1998.5–2002 5.9L 24-valve ISB Cummins engines. These factory-engineered rings restore proper sealing, compression, and oil control—critical for power, efficiency, and longevity. Whether you're refreshing a high-mileage engine or performing a full rebuild, using real Cummins rings ensures correct bore tension, metallurgy, and heat resistance that aftermarket ring sets cannot replicate.
This standard-size ring set is designed for use with unbored, factory-dimension pistons. Cummins applies precise ring geometry and premium steel/tension materials to maintain sealing under heavy loads and high cylinder pressures common in diesel applications. For engines with worn cylinders or damage, oversized pistons and matching rings are required.
Key Features
- Genuine Cummins OEM piston rings for standard-bore 5.9L ISB engines.
- Restores compression and sealing for peak engine performance.
- Correct ring tension and materials engineered for diesel cylinder pressure.
- Compatible with factory standard pistons on 1998.5–2002 24-valve engines.
- Ideal for complete rebuilds or refreshes of high-mileage Cummins engines.
Fitment Details
- Engine: Cummins ISB 5.9L 24-Valve
- Years: 1998.5–2002
- Applications: Dodge/Ram 2500 & 3500, cab & chassis, industrial ISB variants
- Bore Size: Standard (STD) – for unbored OE cylinders
- Notes: If the block is worn or being machined, oversize rings/pistons are required.
Cross-Reference & Companion Cummins Parts
CPP Diesel stocks the complete lineup of Cummins rebuild components. Pair CUMMINS 3804990 with other OEM items:
- CUMMINS 3942562 OEM PISTON KIT – STANDARD
- CUMMINS 3920706 MAIN BEARING SET – STANDARD
- CUMMINS 3802070 ROD BEARING SET – STANDARD
- CUMMINS 3937114 CYLINDER HEAD GASKET – 24V
- VIEW ALL GENUINE CUMMINS PARTS
Common cross-reference numbers: 3804990, 3804990STD, 4955373 (verify by VIN/ESN).
Installation Notes
- Always verify cylinder bore condition before installing standard-size rings.
- Measure ring end gap according to Cummins service specifications.
- Hone cylinders properly to ensure correct ring seating.
- Replace pistons if worn, scratched, or out of tolerance.
- Follow Cummins torque specs during engine reassembly.
Specifications for cummins 3804990
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3804990 |
| Alternate Numbers | 3804990STD, 4955373 (verify by VIN/ESN) |
| Function | Standard piston ring set for ISB 5.9L engines |
| Engine Compatibility | ISB 5.9L 24-Valve (1998.5–2002) |
| Vehicle Fitment | Ram 2500 / 3500 & ISB industrial applications |
| UPC | 190910143730 |
| GTIN | 190910143730 |
| Shipping Weight | Approx. 0.45 lbs |
| Shipping Method | Standard ground; expedited options available |
| E-Codes / Emissions | Non-emissions-critical component |
| Prop 65 Warning | WARNING: May expose you to chemicals known to the State of California to cause cancer. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by lot) |
Frequently Asked Questions
WILL THESE RINGS FIT MY 1998.5–2002 5.9L 24-VALVE?
Yes — CUMMINS 3804990 fits standard-bore ISB 5.9L engines. Always verify by VIN/ESN and confirm that your block has not been overbored.
HOW DO I KNOW IF I NEED OVERSIZED RINGS?
If the cylinders are worn or being machined, oversized pistons and rings must be used. Measure bore diameter before ordering.
SHOULD I REPLACE PISTONS AT THE SAME TIME?
Usually yes. We recommend pairing with CUMMINS 3942562 piston kits during rebuilds.
ARE THESE RINGS GENUINE CUMMINS OR AFTERMARKET?
These are 100% genuine Cummins OEM rings supplied by CPP Diesel for precise sealing and long-term durability.
