Regulator leaking from 12mm bleed screw

Xaccers · Post by **Xaccers** » 10 Nov 2010, 19:56

Cassy's regulator is leaking from the 12mm bleed screw.
Jim and I thought it was actually veg running down from the injectors due to a failed leak off pipe, and after cleaning the area it seemed to be sorted, but the leak is back, I'm using about 500ml of LHM every few weeks.

So what's likely to be the cause?
I remember yonks ago plenty of threads talking about hitting the ball with a brass punch, but can't remember why.

Deanxm · Post by **Deanxm** » 10 Nov 2010, 20:54

Xac, its highly likely that the seal on the bleed screw itself is shot, its like an 'o' ring, its easy to see once the screw is removed. should be cheep enough.

D

VertVega · Post by **VertVega** » 10 Nov 2010, 21:17

According to service pages data, the O-ring mentioned by Deanxm is diam. 6 TO 1.9 .
Don't loose the metal ball (diam. 7) as I did once

Deanxm · Post by **Deanxm** » 10 Nov 2010, 21:19

sound advise, they are damn tricky to find on a gravel drive

D

Post by **CitroJim** » 10 Nov 2010, 21:33

A magnet is your friend...

Find all the nuts and washers you've lost over the years as well...

Kowalski · Post by **Kowalski** » 10 Nov 2010, 21:38

CitroJim wrote:A magnet is your friend...

Find all the nuts and washers you've lost over the years as well...

I didn't think brass was magnetic.

Deanxm · Post by **Deanxm** » 10 Nov 2010, 21:40

the bearing is steel, its the seat thats brass isnt it?

D

Post by **CitroJim** » 10 Nov 2010, 21:46

Deanxm wrote:the bearing is steel, its the seat thats brass isnt it?

D

Yes, the seat is brass. Only monkeys have brass balls...

Deanxm · Post by **Deanxm** » 10 Nov 2010, 21:52

i bet they do tonight!

D

Post by **CitroJim** » 11 Nov 2010, 07:23

Deanxm wrote: i bet they do tonight!

D

He started the night as a brass monkey and ended it as a drowned rat, up this way at least...

Wat a morning

Howling gale and torrential rain... Got soaked walking from the works car park to my office

citronut · Post by **citronut** » 11 Nov 2010, 08:06

are you sure its not an internal leak alowing citro blood into the bleed valve area, as i always thought this just lets air out, and i would have thought the seal/O ring is just to stop dirt ingres and not a fluid seal,

regards malcolm

Xaccers · Post by **Xaccers** » 11 Nov 2010, 09:12

VertVega wrote:According to service pages data, the O-ring mentioned by Deanxm is diam. 6 TO 1.9 .
Don't loose the metal ball (diam. 7) as I did once

Do you have the part number for it?

At nearly 14 years old, so far all the usual o-rings have needed replacing so I'll try that first.

VertVega · Post by **VertVega** » 11 Nov 2010, 10:16

O-ring ---> 402682 --- DIAM 6-TO 1.9

(and bille ---> 021710 --- DIAM 7 , adding just in case...

)

Deanxm · Post by **Deanxm** » 11 Nov 2010, 11:47

the o ring does provide the seal, o rings seal the main components of the regulator itself and the FDV is sealed with o rings alone.
I wouldnt of thought that they take the pressure either but they do.

D

Xaccers · Post by **Xaccers** » 20 Nov 2010, 17:39

Replaced it today, remove the 12mm bolt, caught the ball and about 500ml of LHM.
The old o-ring was flat and rock hard, had to snap it to get it off, fitted the new one and put it all back together (remembering the ball).
Topped up the LHM so will see how it goes.