Description: DOC Diesel Oxygen Catalyst ISX
Condition: New
Brand: Cummins®
Part Number: 4969718, 4969718NX, 4969718RX
Vehicle Fitment 4969718:
| Feature |
Details |
| Engine Model |
Cummins ISX, ISX15, QSX15 |
| Emissions Level |
EPA 2010, EPA 2013 |
| Common Vehicle Types |
Heavy-Duty Trucks (Class 8), Vocational Trucks |
| Typical Brands |
Peterbilt, Kenworth, Freightliner, International, Volvo |
A Diesel Oxidation Catalyst (DOC) 4969718 is essentially the "catalytic converter" for a heavy-duty diesel engine, like the Cummins ISX. It is the first major component in the exhaust aftertreatment system.
|
1. Function
The DOC’s primary job is to break down pollutants through a chemical process called oxidation. It contains a honeycomb structure coated with precious metals (like platinum). When exhaust passes through, it converts Carbon Monoxide (CO) and Hydrocarbons (HC) into Carbon Dioxide ($CO_2$) and water vapor.
2. Supporting the DPF
In an ISX engine, the DOC is critical for "regeneration." It oxidizes fuel to create the high temperatures necessary for the Diesel Particulate Filter (DPF) to burn off trapped soot. If the DOC fails, the DPF will likely clog shortly after.
|
Signs of Faulty 4969718:
|
1. Frequent or Failed DPF Regens
The DOC is responsible for creating the heat needed to clean the DPF. If the DOC is "poisoned" (coated in oil or coolant), it cannot reach the necessary temperatures. You will notice the truck requesting a parked regen more often, or the regen failing to complete.
2. "Face Plugging" or Soot Accumulation
If you look inside the DOC and see a layer of black soot or ash covering the inlet (face), the catalyst is blocked. This increases backpressure, which can damage the turbocharger and reduce engine performance.
3. Low Temperature Readings
Using a diagnostic tool, you might see that the temperature exiting the DOC is not significantly higher than the temperature entering it during a regen. This "temperature rise" is required for the system to work; if it's missing, the DOC is chemically dead.
4. Engine Fault Codes
Common Cummins ISX fault codes include:
|
Manufacturer information
Cummins® is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.
Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.
