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    My Cummins QSB 5.9-380 Diesel is leaking coolant!

    I have twin Cummins QSB 5.9 diesel engines. My starboard engine is leaking coolant. It only happens when I run at full throttle of 3000-3100 rpms. If I cruise at 2700 rpm's or less it doesn't happen. I've checked the reservoir and the hoses leading to the engine and both are fine. I've had the...
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