Hot Manifolds

[tomschauer]

The riser gasket is also a good place to lose coolant into the raw water side of the system

[390Express]

Source of the post The riser gasket is also a good place to lose coolant into the raw water side of the system

Thanks for the tip, I forgot that the coolant side and the fresh water side mix at the riser, so the fresh water has a place to exit.

I like this color coded diagram by CP Performance:

http://www.cpperformance.com/t-marine-c ... stems.aspx

[mjk1040]

Closed cooling has to have the air bleed off to get the entire closed system full of 50/50 mixed antifreeze. One should fill as the engine is running and as the thermostat opens you should see coolant movement in the radiator cap. There may also be a bleeder valve in line to bleed the air out of the system!

[bud37]

390....Curious have you found the issue yet or is it all good now its full of coolant.......

[390Express]

Source of the post 390....Curious have you found the issue yet or is it all good now its full of coolant.......

Well, was good for about 6-10 hours of running at perfect temp after I added coolant. Then, out of the blue, last weekend it puked a shitload of antifreeze out of the motor, but I don't know from where? See new thread.