Truck EGR & DPF Services in Rapid City, SD

Both your EGR system and DPF are responsible for lowering the amount of harmful emissions that exit your truck’s exhaust system. At Reed Repair in Box Elder, South Dakota, we offer a wide array of services for both EGR systems and DPFs.

Mechanic performing EGR & DPF service at Reed Repair

About Our EGR & DPF Services for Trucks & Fleets

After-Treatment Systems Explained

Your heavy-duty truck’s diesel engine produces a lot of harmful emissions. Some examples are carbon monoxide, nitrogen oxides (NOx), and other similar pollutants. Certain after-treatment components are designed to prevent the overall output of these pollutants, whereas others transform or store it after it’s created. Below you will find a description of the two most common after-treatment systems found on modern heavy-duty trucks.

Exhaust Gas Recirculation (EGR) Systems

EGR systems are designed to reduce the overall amount of NOx produced by your diesel engine. Before we jump into how it works, you need to understand that NOx output is highly dependent on your combustion temperature. The hotter your engine runs, the more NOx is created! With this in mind, your EGR system is designed to lower your overall combustion temperature, therefore decreasing NOx output.

So how does it do this? By recirculating spent exhaust fumes through a cooler and then back into your air intake, you’re effectively adding a large amount of cooled air into your combustion chamber. This lowers your engine’s overall temperature, therefore producing less NOx.

Diesel Particulate Filters (DPFs)

DPFs are designed to capture and store carbon and soot before they reach the outside air. DPFs use a fine mesh interior to capture this debris. DPFs need to be cleaned out every once in a while using a process called regeneration. Sometimes DPFs have automatic regeneration, whereas others need to be manually cleaned by a mechanic. In cases where automatic regeneration doesn’t work, a mechanic may need to induce regeneration, which in other words is called forced regeneration.