OK, I understand the vacuum reducing the boiling temperature - but in my engine's case, the water
pump is before the engine
, so the hose under vacuum/suction - from the seacock through the strainer to the inlet of the raw water pump
is not at elevated temperature at all - i.e. before the engine
The raw water
enters the engine on the OUTLET side of the raw water
pump - so presumably the hot bits will never be under vacuum.
Or am I misunderstanding something?
On installing a temp gauge, I would love to, but where does the sender go?
I will run the engine again tomorrow to charge and will measure the temperatures again and report back!
Thank you very much again!