Hi Guys,

 

A while back the black plastic bleed screw on the top of my Koyo decided to shear off, I found that an M10 bolt fitted nicely with some rubber washers - which worked up until last week... when I accidentally overtightened and stripped the threads in the alloy flange.

 

I have attempted to tap it out to an M12, but all that did was make the hole bigger and only give it 1 thread (I have never tapped anything in my life... this may be the problem lol)...

 

Does anyone know if i would get away with an M14 tap on the flange?!, or is it best to seek somewhere that can replace the flange with a new one?

 

TIA Chaps,

 

-Stu

How thick is the material you are tapping?

Have tapped it to M14, and used a wheel bolt from a Peugeot, packed with some rubber washers - will be putting rad back in shortly so will let you know if it works! I imagine alot of ppl have snapped the original, plastic screw.

 

FYI there was about 5mm alloy to tap, which has given me 3ish threads, seems to hold tight with the rubber though.

 

-Stu

Cool. The thinner the metal the finer thread you need

Cool. The thinner the metal the finer thread you need

 

Hi m8, yeah I managed to get a 1.5tap, would have preferred 1.25 but apparently that size is a bit like hens teeth for the M14(Where I 'borrow' my bits from tht is).

 

The wheel bolt wasnt holding out so well so have now bodge a bit of steel rod and tack welded two nuts together onto the top of rod, again packed out with rubber washers and it seems to be working a treat :D

 

 

Excuse mess of bay, but when its sprayed well over 40 litres over its self in the last 3 months, what do you expect lol - However, thats I think is just about every damn water hose been done on that car, finally I think its fixed!

 

 

-Stu

Edited March 8, 200916 yr by ScabbyZ32
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if it goes again get an alloy nut welded to the top of the flange and use it as an extended threaded flange and screw the bolt in it with a leather or neoprene tap washer on it

if it goes again get an alloy nut welded to the top of the flange and use it as an extended threaded flange and screw the bolt in it with a leather or neoprene tap washer on it

 

Just googled the washers you are mentioning, neoprene looks ideal!

 

The threads probably will strip again in the future - sods law, I will however keep your suggestion in mind, thanks m8

 

-Stu

Edited March 8, 200916 yr by ScabbyZ32

would a small helicoil work...not sure how big the rad hole is...touble is you'll have to buy a whole kit...not a bad investment...do a google search for them