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I hit a tiny airbubble in the casting in the exhaust port when I ported the TS head. Now I have a very small water breaktrough. Checked with pressure in a bath.

After several welding attempts it only got worse.

I'm thinking of placing bushes (shrinked into the head).
It is pretty wild, I know, but has anyone ever tried this?
The good part of it is that the port geometry will be exactly the same (CNC milling and tubes from the lathe).

Or should I consider the head lost and take it as a man

Saluti,
Maurizio

JB weld? People use it to fix pitted liners and many other engine parts. Might be worth a try. It is cheap and what do you have to lose?
One of my friends had a small coolant leak in his Nissan 240 and when we took the head off the leaky cyl was perfectly clean while the others were dirty. The leak was small so it was working like water injection Maybe this leak is a performance upgrade

The leak is on the top of the exhaust port but I don't want to take the risk of running it like it is. This is asking for trouble.
My feeling is that the heat cycles will enlarge it to a crack in the alloy because of the temperature differences (gas on the inside \ cooling water outside).

JB weld won't work, I not a fan of glues and other chemical stuff, have had to much bad experiences.

I favor a mechanical solution.

A TIG welder couldn't fix the problem? That is a tough break. Hope you can figure out some insert solution.
Best luck
James

post pics please of entire porting and head prep ... very sad about port problem i am now workin on nord head ..and TS later and i am very interested

jammer voor al je werk!!
groetjes,marc

Maurizio where exactly u break water passage ? in exh port ?
as i see in this pic there is a lot of room for porting in exh.
http://img300.imageshack.us/my.php?image=24hn.png

The breaktrough is in the top of the exhaust port. There is a probably a crack or air bulbe in the casting to the oval water passage.
Haven't cut the head in two peaces yet to see what the real problem is.
But I think I just had bad luck 3 of the ports are ported the same and no problem.

We will do a last attempt to weld it at a firm which is specialized in welding heads.

Porting dimensions ..... buy the book when it is out , have had some inside info from greece, even before there was a plan of the TS update

Maurizio wrote:...Porting dimensions ..... buy the book when it is out , have had some inside info from greece, even before there was a plan of the TS update

hihi nice one . i want this books too ... thats why i am messing with
NORD head for now .. waiting for pics ... or they are restricted from Hellas ?

I have a crack in the #3 exhaust port of my Nord head. I have water seeping out of the copper exhaust gasket on top and air bubbles pulsing in my water overflow bottle. I plan to remove the head and see how bad it is. I'd like to hear what you've done so far and how it worked.

I put in a bottle of radiator stop leak and it actually stopped it for a while. I may try it again, since it's cheap. JB Weld has another product for this exact problem; I think it called water weld, or coolant sealer, or something. It is likeley designed with iron heads in mind, but I might try it anyway, before pulling the head.

@iachella,

it was a very tiny hole in #3 also. Now the head is to a specialised firm. They ensure first if it can be welded. I think x-ray. Then mill the crack out and tig weld the alloy. JB weld etc won't work in an exhaust. At that place the thermal load is very high, exhaust gas on one side and on the inside cooling water.

Saluti,
Maurzio