When modifying a Cummins ISX or X15 engine, one of the most important considerations is ensuring proper coolant circulation – especially when performing an EGR delete. Our premium coolant transfer tubes (part numbers 4367122 and 5575183) provide a reliable and durable solution, ensuring your engine runs efficiently without leaks or overheating. Whether you’re working on a CM871, CM2250, CM2350, or CM2450, our tubes offer the best EGR cooler bypass solution available.
Why Are Coolant Transfer Tubes Essential?
Coolant transfer tubes play a crucial role in maintaining optimal engine temperature by allowing coolant to flow seamlessly between different sections of the engine. They replace the function of the EGR cooler, which, in a stock Cummins ISX or X15 engine, helps keep coolant moving. However, when an EGR delete is performed, the cooler is often no longer necessary or, if left in place, it may develop leaks over time.
The Role of the EGR Cooler in Coolant Flow
The ISX engine with exhaust gas recirculation (EGR) utilizes an impeller design similar to the QSX15 engine to maximize the cooling capacity of the water pump. To accommodate the increased heat and flow associated with the EGR system, the water pump pulley drive ratio was increased, resulting in higher pump speeds and improved cooling performance.
By installing our coolant transfer tube (4367122 or 5575183), you maintain the intended performance of the water pump and the engine’s cooling system design, ensuring proper coolant flow even after an EGR delete.
A measured amount of the water pump’s flow goes through the EGR cooler before returning to the back of the block near the #5 and #6 liners. If the EGR cooler is removed, the water pump experiences excessive pressure and struggles to deliver cooler coolant to the rear of the engine efficiently. This can lead to overheating issues in the rear cylinders, potentially causing liner damage, premature wear, and reduced engine lifespan.
What Happens If the EGR Cooler Leaks?
If an engine has undergone an EGR delete, the EGR system is no longer active, but the cooler may still be present. While it can continue to circulate coolant, an aging or faulty EGR cooler can develop cracks and leaks, leading to:
- Coolant loss
- Overheating
- Engine damage
- Expensive repairs
Rather than replacing a costly EGR cooler, our custom-designed coolant transfer tubes provide a simple, cost-effective alternative that restores proper coolant flow to the back of the engine.
The Benefits of Our Coolant Transfer Tubes
✔ Exclusive Coolant Vent Feature – Unlike other options, our pipe includes a coolant vent that prevents air from being trapped in the system during coolant filling and engine operation. This vent continuously flows coolant to the top tank of the vehicle cooling system, ensuring efficient and bubble-free operation.
✔ Engineered for Cummins ISX and X15 Performance – Designed to fit Cummins ISXCM871, ISX15CM2250, ISX15CM2350, X15CM2350, and X15CM2450 applications perfectly.
✔ Prevents Overheating – Ensures coolant circulation remains uninterrupted, even after an EGR delete, reducing the risk of hot spots in the rear cylinders.
✔ Leak-Free Design – Eliminates the risk of leaks that can occur with worn-out EGR coolers.
✔ Long-Lasting Durability – Built from high-quality materials to withstand extreme conditions.
✔ Easy Installation – Direct replacement with no modifications needed.
Upgrade Your Engine with Confidence
If you have a Cummins ISX or X15 engine and have performed an EGR delete, our coolant transfer tubes (4367122 and 5575183) are the best solution to maintain your engine’s cooling system without relying on an outdated or failing EGR cooler. Whether you need an EGR cooler bypass or want to improve your cooling system’s reliability, this upgrade is essential.
Don’t wait for leaks or overheating to become a problem. Upgrade to a reliable and maintenance-free cooling solution today!
Contact Us for More Information
For pricing, availability, and technical details, get in touch with us today! We’re here to help you keep your Cummins ISX CM871, CM2250, CM2350, or X15 CM2350, CM2450 engine running at peak performance.