The Cummins Qsl9 utilizes a keel cooler, circulating a 50/50 mix of antifreeze and water for cooling instead of raw saltwater. This system differs from a standard raw water cooled system, requiring specific maintenance procedures. This guide outlines the key aspects of servicing the aftercooler and keel cooler on a Cummins QSL9.
Servicing the Cummins QSL9 Aftercooler
The aftercooler core, responsible for cooling charged air, can be challenging to remove, especially for first-time servicing. Various DIY methods, using tools like wood blocks and PVC rings, have proven effective in extracting the core bundle. Consult online forums and resources for detailed instructions and visual aids. Given your experience as a master mechanic, this task should be within your skillset.
Combining Aftercooler and Coolant Service
Since your QSL9 employs a keel cooler system, draining the coolant is a prerequisite for aftercooler service. This presents an ideal opportunity to combine aftercooler maintenance with a comprehensive coolant system flush. While the coolant is drained, consider servicing the entire cooling circuit to ensure optimal performance and longevity.
Cleaning the Air Side of the Aftercooler
The air intake of the aftercooler accumulates oil mist, salt, and other debris over time, especially after 5700 hours of operation. Expect a gummy, oily residue on the cooling fins. Thorough cleaning is crucial for efficient heat exchange. Consult resources like “Tony’s Tips” for detailed cleaning procedures and recommended products. These resources offer decades of collective experience and invaluable insights for maintaining your Cummins QSL9.
Conclusion
Servicing the aftercooler and keel cooler on a Cummins QSL9 involves specific procedures due to the keel cooling system. Combining aftercooler service with a coolant flush maximizes maintenance efficiency. Remember to thoroughly clean the air side of the aftercooler to remove accumulated debris. Leveraging online resources and forums provides valuable guidance for tackling these tasks effectively. Regular maintenance ensures optimal performance and prolongs the lifespan of your Cummins QSL9 engine.
