3423783 EGR Cooler Air Charge For Cummins

3423783 EGR Cooler Air Charge for Cummins

What Is An EGR Cooler On A Diesel Engine
1. Full Name & Basic Definition
EGR = Exhaust Gas Recirculation Cooler It is a compact water-cooled heat exchanger installed on modern turbo diesel engines (gensets, trucks, marine engines) to meet strict emissions rules (Tier 4, Euro VI, IMO Tier III).

A portion of super-hot exhaust gas is diverted from the exhaust manifold and sent through the EGR cooler first, before mixing back into the engine's intake air.

- Hot exhaust gas = 600–780°C
- The cooler drops its temperature down to 100–150°C
Cool exhaust contains inert gases (CO₂, water vapor). When mixed into combustion chambers, it lowers peak flame temperature and drastically cuts NOₓ (nitrogen oxide) pollution, the main toxic emission from diesel engines.

Without cooling the exhaust first:
Hot gas would overheat intake air, raise combustion heat, and fail to reduce NOₓ effectively.

How It Works Step By Step
Hot sooty exhaust gas branches off the exhaust pipe and enters the EGR cooler's stainless steel tubes.

Engine antifreeze/coolant flows around the tubes in separate sealed channels and absorbs exhaust heat.

Cooled exhaust flows out the other side, controlled by an EGR valve based on engine load/speed.

Cool exhaust mixes with fresh compressed air from the aftercooler, then enters cylinders to burn.

Heated coolant flows back to the radiator/remote air cooler to release waste heat.

Material Specialization (Why Stainless Steel Only)
Exhaust contains sulfur from diesel fuel. When cooled, it forms corrosive sulfuric acid condensate inside the cooler.

EGR coolers use 304 / 316 stainless steel to resist acid corrosion and extreme thermal shock.

Copper/aluminum cannot be used here - acid eats through them quickly.