What's this thread?

[flatlander]

Does anybody know what this thread is? It's on the radiator fill / balance pipe, coming from the header tank. The rad is from a Disco, and none of my various pipe fittings fits. The local plumber shop can't help either. It seems not to be BSP. I need to fit a new bit of tube, but don't want to upset anything until I know I can get a replacement if needed.

 

[jamesmartin]

id need a better description

 

[TorsionBhudda]

NPT possibly

 

[jamesmartin]

View attachment 150934 Does anybody know what this thread is? It's on the radiator fill / balance pipe, coming from the header tank. The rad is from a Disco, and none of my various pipe fittings fits. The local plumber shop can't help either. It seems not to be BSP. I need to fit a new bit of tube, but don't want to upset anything until I know I can get a replacement if needed.

never seen that set up on a rad,

 

[flatlander]

id need a better description

The second pic shows where it comes from. The OD is 12mm, and the thread pitch is (as far as I can see) one thread per mm. My local hydraulic shop is open on Monday, so I can take it in there to see if they can help.

 

[jamesmartin]

The second pic shows where it comes from. The OD is 12mm, and the thread pitch is (as far as I can see) one thread per mm. My local hydraulic shop is open on Monday, so I can take it in there to see if they can help.View attachment 150935

its not the rad thread then but the pipe union,what spanner size is the fitting

 

[Mingus]

looks like a brake pipe with a flared union.

 

[Jam1]

Am I missing something? Why not just reuse that fitting with a new pipe?

 

[flatlander]

its not the rad thread then but the pipe union,what spanner size is the fitting

Sorry James, my first post wasn't clear. A 14mm spanner fits the nut.

 

[flatlander]

Am I missing something? Why not just reuse that fitting with a new pipe?

The pipe shows signs of having been brazed while in place. If I bugg3r the fitting removing the pipe I want a fighting chance of replacing it.

 

[Oldseadog]

14mm could possibly be 9/16" which could make the fitting an old-style 1/4 clutch pipe male end with an olive fitted.
The pipe is easily available as are the ends. However, I would beg or borrow a flaring tool to make off the end rather than fit an olive.

 

[tottot]

What ever it is it is not standard.What does it do?

 

[flatlander]

14mm could possibly be 9/16" which could make the fitting an old-style 1/4 clutch pipe male end with an olive fitted.
The pipe is easily available as are the ends. However, I would beg or borrow a flaring tool to make off the end rather than fit an olive.

The larger thread is 1/2"BSP, so tomorrow I will be drilling and tapping the brass adaptor to BSP, which means I will be able to use a 90 degree bend and hose adaptor I have to hand. Problem solved, thanks to everyone who responded.

 

[flatlander]

What ever it is it is not standard.What does it do?

It joins the rad balance tank, permitting coolant to flow between the header / balance tank and radiator.