Is this radiator faulty?

[Sprogginz]

I bought this radiator some time ago but only fitted it a few weeks ago.
The problem is that it leaks from one of the connections into the rad.
I have tried three time now to fix it but it still leaks.
There is now a bubble in the paint work that you can see in the photo.
I have used plently of PTFE tape (is it possible to put too much on?) and carefully screwed it in being mindful not to cross the threads. There is a washer on each connection where I have swapped the washers over just to see if it starts leaking from the other connection but it does not.

Is there anything else I can or should try such as using Fernox LS-X?

Thank you and hope you can help.http://www.screwfix.com/p/fernox-ls-x-leak-sealer-50ml/23614

 

[footprints]

If LS-X will not fix it nothing will. It should not need a washer on the tapered thread.
Just possible you have a pin hole in the rad if bubbling already though.

 

[jeff the gasman]

Loctite 55 string instead of ptfe. Threads can be very loose on these.

 

[AGAS]

could be fault in rad on weld seam

 

[ianmcd]

+1 for pinhole on the weld but you would have to flake the paint that has bubbled off to see,

 

[Sprogginz]

Okay, thanks guys.

I'll try one more time with LS-X (although Loctite 55 looks interesting as well - might give that a go!), then if no joy, pull the paint off to see if there is a pinhole.

 

[bernardgreen]

The pin hole could be in the sheet metal, it doesn't have to be in the weld.

 

[jeff the gasman]

Okay, thanks guys.

I'll try one more time with LS-X (although Loctite 55 looks interesting as well - might give that a go!), then if no joy, pull the paint off to see if there is a pinhole.

Once you've used Loctite 55 you'll never use PTFE again.
Jeff

 

[bazdaman]

Its not the threads its a pinhole! Take the rad back, even if you could seal it you wouldnt want a new installed rad with bubbled paint and rust!

 

[AGAS]

the rad is only going to cause trouble ahead in future just take it back not fit for purpose.

 

[jeff the gasman]

If LS-X will not fix it nothing will. It should not need a washer on the tapered thread.
Just possible you have a pin hole in the rad if bubbling already though.

Might be alright for rainwater but utterly useless otherwise. Pressure finds it way through this product in no time.
Jeff

 

[footprints]

Why do you say that Jeff? I have to say it has never let me down on a thread or comp joint, true just splodging it on the outside of a pin hole is a bit hit or miss. Any time I have done a temp repair like that I use some rag as a bandage to reinforce the "temp bodge".

 

[dilalio]

Defective rad. To prove this you could take it off. Charge it with air using a pump and use gas leak detector spray or washing up liquid to locate the source.

Or just send it back