4313836 | Genuine Cummins® EGR Cooler For Cummins 12L ISX/QSX

An EGR Cooler (Exhaust Gas Recirculation Cooler) 4313836 is a component in diesel and some gasoline engines that cools the exhaust gases before they are recirculated back into the engine’s intake. Its purpose is to reduce emissions, lower combustion temperatures, and improve overall engine efficiency. EGR Cooler For Cummins EPA10/13 12 liter ISX/QSX engines

General Specifications

Fitment

Purpose & Function

1. Cools Exhaust Gas

• Hot exhaust gases are passed through the cooler, where coolant absorbs the heat.
• This reduces the gas temperature significantly.

2. Lowers Combustion Temperatures

When the cooled exhaust gas is mixed with the fresh air entering the engine:

• The peak combustion temperature drops

• This reduces harmful NOx (nitrogen oxide) emissions

3. Protects the Engine

Cooler exhaust gas helps prevent:

• Engine knock

• Overheating

• Premature wear on engine components

Signs of Bad EGR Cooler

1. White Smoke From Exhaust

• One of the most common symptoms

• Caused by coolant leaking into the exhaust system and burning off

• Smoke often has a sweet smell

2. Coolant Loss With No Visible Leak

• Coolant level drops over time

• No external drips because coolant is leaking inside the EGR cooler and going out the exhaust

3. Engine Overheating

• A failed cooler disrupts coolant flow

• Can cause the engine to run hot or overheat under load

4. Check Engine Light or EGR Codes

Common fault codes include:

• EGR flow insufficient

• EGR cooler efficiency

• EGR temperature sensor problems
  The ECM detects abnormal gas temperatures or incorrect EGR flow.

5. Poor Engine Performance

• Reduced power

• Rough idle

• Turbo lag

• Hesitation during acceleration
  If the cooler is clogged with soot, EGR flow becomes restricted.

6. Excessive Exhaust Back Pressure

• Caused by a clogged EGR cooler

• Can trigger turbo-related faults

• May cause the engine to run louder than usual

7. Sweet Smell From Exhaust

• Coolant entering the exhaust produces a sweet, antifreeze-like odor

8. Steam Coming From Exhaust

• Severe coolant contamination can create steam clouds, especially on startup

9. Contaminated Coolant

• Oil or soot mixing into coolant

• Coolant turns dark or sludgy

About Cummins

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.