Yes I suspect that they will be glowing dull red sometimes, so it is probably important to exaggerate the pipe wall thickness .




The industrial tubes which I use contained nickel i think to increase the strength when heated

Johan

aluminium on aluminium would be unusual, but whit out the right lube it would gall like it vas no tomorrow
and like vise on Stainless on Stainless, it works but requires the right lube. i use grafite on Stainless and alu, i prefear steel on any bolt
thats not outboard.

Hej och välkommen.

Johan

And here is a side Wheeler from sweden. the Eric Nordevall II

https://www.youtube.com/watch?feature=p ... TUuR50Ou14

Yes they are, not that inportant on the vacum line in the middle but you never know.

Thank you Double dutch that sounds like a good solution. but the problem is almost gone since I adjusted and removed some shims at the exenter driving the LP valve. all the endplay made the valve a litle off in timing. the gauges in the wheelhouse, with the LP gauge at the right http://i1022.photobu...

The Scaled down HUNTINGTON 30 ft tug sounds almost like mine. but a bit heavier.

Thanks for all the answers and tips, I'm going to continue to trouble shoot , start with the timing of LP slide valve i Think.
I've noticed that the valve seems to leak.

the needle is not steady, its moveing, with pressure in the reciever,


and it sounds like the sound is coming from the pressure gauge.
I know that it is not so,but it is what it sounds like. I have observed the tube but nothing that seems to be lose.

the engine is fairly well insulated, I have even isolated the underside of the cylinders, so think not that I am getting condensation from there. but have had problems with priming in the boiler. in times when oil separation has been failing in the hotwell. but that has not happened since I cleaned ...