Technical Constipated Dump Valve

[allanhelen]

The dump valve has stopped errr dumping for some reason

Are you meant to service these things at all or do they just keep working. I have stuck the old one back on for the time being until i get chance to look at it but not happy

 

[fingers99]

They should just keep working. When I've heard of the Bailey ones not working, they've failed in the open (pop off) position. If they fail in the shut position you're looking at possible turbo damage.

Send it back to them!

I take it the old one is working fine?

 

[allanhelen]

yeh the old one is working fine and there is good vac on the line

You can open the dump valve when you push it by hand, I'll strip it and have look at the weekend, but it is only a piston, spring and rubber seal so there is not a lot that can go wrong

 

[arc]

on my mates car, the DV he fitted to that wasn't working. took it off, and boiled it up in a big of grease. it cleaned the excess off and refitted it. Couple of mins later it was working again

 

[J333EVO]

If its a piston type I found that in cold weather they can stick until the engine temps get high enough to free it off.

The old one that was fitted to the car when you bought it is a diaphragm type that does not stick.

 

[allanhelen]

On the road as usual sorry for the late replys

It is a piston type Bailey dump valve but it has worked though lower temps without a problem. The only difference is that the car has been stood for a couple of weeks with little use so i suspect it is lubrication that is the issue but even so it is not acceptable.

I'll have a look at the weekend (Heathrow terminal 5 permitting that is)

 

[fingers99]

Bailey's are probably the most common dump valve out there. Reading Dave Walker's thing in PPC, looks like they had a 100% rep for reliability and then duff ones started turning up. Could have just been a bad batch: I'd think it's probably more to do with manufacturing tolerances or material changes than lubrication issues (I mean, strictly speaking, the thing isn't supposed to be lubricated).

But get in touch with Bailey and I'm sure they'll see you right (and if their BOVs are going wrong, they need to be told).