Coolant leak on top of exhaust manifold Cummins 6cta


FormulaONE

New member
Hello everyone ,

I am hoping to get some clarity on this so that I can sleep at night. So we have had a recent cold snap here in Philly and I decided to go check on the boat ( 1999 41 PC ) as she is on the hard shrink wrapped for her winter slumber. During my inspection of the engine room I found a small amount of engine coolant ( not the pink stuff for winterizing ) leaking from the water jacket cover on the top of the exhaust manifold and also from an aux heater line bung ( see photo's ) the engines are Cummins 6CTA 8.3 M3 Diamonds. It was not totally alarming as I ran 6 gallons of pink through both engines and I am confident that there was enough pink flowing from the exhaust when I put her away in October. What really peaked my interest is that I cracked the heater line bung open to see if it was engine coolant or pink from winterizing in the manifold and it was slightly pressurized!!.

Has anyone experienced a small amount of pressure in the coolant system while cold?. I think that my biggest fear is if one of the coolers expanded during the freeze and created pressure that way ( I hope not )

Any input , ideas , suggestions would be greatly appreciated!!
cummins leak.jpg

Thank You!!
- Bob
 
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