Which setup is used for the EGR coolers on GHG17 DD15 and DD16 engines?

The setup involving removable EGR coolers attached to a separate coolant collector is the correct choice for GHG17 DD15 and DD16 engines. This design allows for efficient temperature regulation and enhances the effectiveness of the EGR system in reducing nitrogen oxide emissions by cooling the exhaust gas before it is recirculated back into the engine's intake system.

The removable aspect of the EGR coolers facilitates maintenance and replacement, ensuring that any necessary repairs or servicing can be conducted without needing to replace the entire assembly, which contributes to lower downtime and cost-effectiveness. The use of a separate coolant collector optimizes the flow of coolant around the EGR coolers, enhancing heat exchange efficiency, which is crucial for maintaining the desired exhaust gas temperatures to promote optimal combustion and emissions performance.

In contrast, the other options present variations that do not match the specific design utilized in GHG17 engines. For instance, a single piece cooler with a coolant jacket may not provide the same level of serviceability or performance efficiency as a removable setup, while complete removal of the EGR cooler mounted to a full-length collector or integrated cooler designs could lead to inefficiencies or complications in heat management and exhaust flow dynamics.