The turbocharger on the dCi6 engines in Mack Freedom model chassis use an outlet adapter that cannot be checked for leakage by conventional methods. The following method can be used to investigate low power complaints or when performing similar diagnostic procedures:
• Disconnect the turbocharger inlet elbow from the intake air duct.
• Using the charge air cooler tester (Tool No. J 41473), insert the plug with the air fitting into the rubber inlet elbow and secure it with a suitable hose clamp. Be sure to connect the safety cable in an accessible location to prevent the plug from blowing off when the system is pressurized.
• Connect the pressure regulator and gauge assembly from the test kit to the air fitting in the plug. Then connect shop air to the regulator.
• Slowly open the air regulator to apply a maximum of 9 psi to the intake system. The engine might need to be slowly rotated to prevent overlapping valves. If it is necessary to rotate the engine, close the air regulator to block the flow of air to the intake system.
• Spray a soap and water solution on the connection for the turbocharger outlet adapter to check for leaks. Also, spray the complete intake system, from the turbocharger inlet to the intake manifold gaskets, to check for leakage at those locations.
