Fresh Water Coolant Caps

[bhoulihan]

I have 2 18 hp Volvo Sail Drives - Some work was done on one engine at River Bend Marina in Ft. Lauderdale (Avoid if possible) in which the exhaust manifold was replaced and a new "radiator" cap installed. I have continued over heating on that engine (a prior issue) but the last time I had coolant in the bilge. The Original cap reads "75 kph" - the replacement cap reads (a US cap) "6.0". Does anyone know for sure, what pressure is "75 kph" in US terms?

I am thinking that the 6.0 cap may release at too low a pressure.

Thanks,

Bill

San Diego