I can't think of anything that the "6.0" would relate to. And it is surely too low for a radiator cap pressure. Even 11PSI is a little on the low side. I also would ahve thought the 75 would have been Kpa, not Kph, but I will take it as a typo. As Pete said, 75Kpa = 10.875 PSI or near as darn it to 11PSI.
The pressure won't "stop" the over heating
, pressure allows a higher temp to be achieved before the water
boils. But if you lose pressure early, the water
will boil out and thus you will then get over heating. I would get a correctly rated cap on there pronto before you go doing some big damage.
Now why is it that the "so called proffesionals" are dropping the ball all the time. Darryl on here is having a nightmare over a Volvo
install and bad bad workmanship, not to mention some seriously wrong advice from the Volvo agent and I have just been helping some very poor boatie with a major problem with his alloy prop and stern leg. The yard has painted copper based anti-foul on the things and they have eaten away. I will open a new thread with a photo
of the prop.