I came back to the boat after winter storage. Found about 1/2 cup of coolant had dripped from somewhere under the header tank of the Cummins QSB and figured I had a leak somewhere. Cleaned it up and none came back, motored 6 hours, completely dry. Now after sitting in the slip for 5 days, a very small drip in about the same place.
On the QSB, there is a cast tank that the filler cap goes on, bolts to the intake manifold, there are some ins and outs. The leak appears to originate no where near any fitting or freeze plug. And only seems to leak when cold. It is a hard area to see, a green stripe below it on the heat exchanger suggests it has been happening for some time. Any suggestions?
On the QSB, there is a cast tank that the filler cap goes on, bolts to the intake manifold, there are some ins and outs. The leak appears to originate no where near any fitting or freeze plug. And only seems to leak when cold. It is a hard area to see, a green stripe below it on the heat exchanger suggests it has been happening for some time. Any suggestions?