radweld to fix leak?

[J R ALSOP]

Are you sure that their is no air in the skin tank?, have you bled it.

[springy]

Is there any need to have a pressurised system as long as you have a good capacity expansion tank? I have a BMC 1.5.

 

 

The idea for having a pressurised system is that it raises the boiling point of water above 100°C.

 

So reducing the likely hood of steam if the engine overheats.

Yes having a pressurised system IS necessary for some engines - many automotive derived engines

 

are designed with a pressurised system - to the point that running unpressurised can under heavy

 

loading cause "spot boiling" in the water galleries around the exhaust ports in the cylinder head - this

 

in turn reduces the efficiency of the cooling system leading to overheating.

 

 

Most proper marine engines are designed with adequate cooling galleries to ensure proper function

 

even at atmospheric pressure (but also probably use much more water/antifreeze mixture if appropriate).

 

 

springy

Edited April 16, 2012 by springy

[Higgs]

Yes having a pressurised system IS necessary for some engines - many automotive derived engines

 

are designed with a pressurised system - to the point that running unpressurised can under heavy

 

loading cause "spot boiling" in the water galleries around the exhaust ports in the cylinder head - this

 

in turn reduces the efficiency of the cooling system leading to overheating.

 

 

Most proper marine engines are designed with adequate cooling galleries to ensure proper function

 

even at atmospheric pressure (but also probably use much more water/antifreeze mixture if appropriate).

 

 

springy

 

Ok - will run it pressurised. Have to sort that leak first. Cheers

[robmilton]

Hi, you mentioned water under the engine area but not mentioned what engine you run, have you checked the water pump ? they can leak for quite a while before becoming obvious, and usualy show a coloured crusty area if they are leaking. (usualy brown for a labrador).

[WotEver]

That'll be a Vetus Mine did that till I did a little mod.

Mine still does - I've just stopped filling it up

 

Hi, you mentioned water under the engine area but not mentioned what engine you run, have you checked the water pump ? they can leak for quite a while before becoming obvious, and usualy show a coloured crusty area if they are leaking. (usualy brown for a labrador).

I had a Mondeo that would lose the entire contents of the cooling system from the water pump in a 30 mile trip. When I part-exed it I parked it in a wet corner of the forecourt so's the dealer wouldn't see the puddle under the engine

[Grace and Favour]

Mine still does - I've just stopped filling it up

 

 

I had a Mondeo that would lose the entire contents of the cooling system from the water pump in a 30 mile trip. When I part-exed it I parked it in a wet corner of the forecourt so's the dealer wouldn't see the puddle under the engine

 

Ah - - I knew I'd meet up with you again one day!

 

Now - about that Mondeo, Squire!

[WotEver]

Ah - - I knew I'd meet up with you again one day!

 

Now - about that Mondeo, Squire!

Did you sell me a silver Vectra?

 

If so I'm unsubscribing...

 

Tony

[Mandy]

Are you sure that their is no air in the skin tank?, have you bled it.

Sorry for my continued ignorance but how do I bleed the skin tank?

[WotEver]

Sorry for my continued ignorance but how do I bleed the skin tank?

At the top of the skin tank, probably close to where the top hose joins it, will be (should be) a small bolt. When the system is cold, loosen that bolt (do not drop it or you'll have made a pretty little fountain in your engine 'ole). If air comes out, wait until the air stops and only water comes out. Tighten screw.

 

Does that make sense?

 

Tony

[Mandy]

At the top of the skin tank, probably close to where the top hose joins it, will be (should be) a small bolt. When the system is cold, loosen that bolt (do not drop it or you'll have made a pretty little fountain in your engine 'ole). If air comes out, wait until the air stops and only water comes out. Tighten screw.

 

Does that make sense?

 

Tony

As soon as I get home from work I shall investigate - thanks. Over the last three years I have progressed from taking my boat into the yard if it needed a light bulb changing (almost) to doing my own servicing and now mending the odd problem, but I still don't know a lot more than I know - if you know what I mean!

[bizzard]

And if air comes out don't forget to top up the engines coolant at its header tank.