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[Diamond Black Geezer]

As you know Webby, I'm having leaking issues too ( )

Now I'm back off my hols, tonight i get to play again. My prob is I think I've found the leak (just by having the engine off and blowing into various pipes, and listening for hisses) I've narrowed it down to the vacuum reservoir next to the pollen filter. Unfortunately I can find no way of getting the thing off to properly 'ram' on the rubber elbow.

Block the outlet on the reservoir with finger = no wheeze
Block off the hose, blow into other end = no wheeze
Push the hose back on, apparently 'good n tight' = wheeze back again.

So I say that's a bad seal. Tried replacing the rubber elbow for a better one. Still the same. Sorry to be hijacking your thread, by the way! My point being, of course. I know your pain, and hope both our leaking improves soon 

[Webby the Bear]

You have a nice holiday mate?

You need to remove the scuttle to get at that rear vac resevoir

[Diamond Black Geezer]

That's already off mate 

Can't see any torx or anything. Strange 

[Webby the Bear]

And you still cant get to it? Can you see it at all?

Throw up a piccie

[Diamond Black Geezer]

Sadly no ability to get a pic yet (at work. They make me come in five days a week, the sods!)

Yes, can see it perfectly clearly, felt around the brackets where the other vacuum reservoirs have their studs, and it seems to be smooth. So weird! There'll be some difficult to see studs or something I'm sure, but I'm just not seeing it. 

[Webby the Bear]

Sadly no ability to get a pic yet (at work. They make me come in five days a week, the sods!)

Yes, can see it perfectly clearly, felt around the brackets where the other vacuum reservoirs have their studs, and it seems to be smooth. So weird! There'll be some difficult to see studs or something I'm sure, but I'm just not seeing it. 

Do you have to remove it to check it? Can you not just pull vac pipes off and listen for hissing like with the front ones? Then look at removing it if you think its fekked?

[Diamond Black Geezer]

Yeah, that's what I've done, good fellow 

Blew into one of the pipes, there was a hiss from that area. So disconnected one, and held my finger over the disconnected pipe, blew into again - no hiss, so not leaking from that pipe.

Ok, so disconnect the other pipe, reconnect the original pipe, seal the remaining hole at the reservoir with my finger, then blow again = the noise goes.

Reconnect the 2nd pipe, blow again = hiss again.

as a final check, disconnect 2nd pipe, blo into other end = no hiss, so not leaking from 2nd pipe.

[Diamond Black Geezer]

Sorry, realised I've hijacked your thread  To return things back to you, last night, as my top hat was torn, I refitted it, but using a spare (also torn) I chopped off the 'extra' thus leaving just an o-ring shape. I warmed this in warm water, then stretched this over the whole top hat assembly, then refitted the breather bridge. So I have one seal in place (with a tear) and one past it, 'at the base'... No idea if this has actually done anything positive or not, but it's theoretically sealed the breather bridge. Of course a handy o-ring from your o-ring set will do the job as good/better, but I didn't have any handy o-rings present, only two torn top hat seals 

Hope this is sorting things, anyway!

[Marks DTM Calib]

The vac res on the heater assembly is plastic welded on, you wont shift it easily.

As for the breather bridge top hat, with the correct seal correctly fitted (I know how you like to bodge the wrong seals on Webby  ) the seal seals against the machined hole and not any where near the top of the plenum

[Webby the Bear]

That machined hole is in the top of the plenum......... or have i missed something 

[Diamond Black Geezer]

Thanks Mark.. just did my little bodge (have I been hanging round Webby too much?) to try and stop any air that would be weeping past the damaged top hat seal actually leaving the plenum, as I was literally kicking my heels with nothing to do, due to not having a spare seal. Good to knwo the seal does have a critical function... here's hoping this tiny leak is the cause of Webbys (and my) woes!!! 

[Diamond Black Geezer]

Also I think Mark was referring to my bodge, as the seal sits inside the hole, against the machined surface, not on the rough cast top surface - where my modified o-ring sits. 

[Webby the Bear]

ok got ya. to be fair to me i have an OE ''top hat'' in there

its hell frauds o rings ive fitted to the TB..... Bodge? perhaps. Does it work better than the brand new OE ones. Hell yeah 

[Diamond Black Geezer]

Hehe, Yeah, don't worry, not knocking you, my good man. I certainly don't mind putting genuine Vx o-rings etc.. when they're literally pence, less that £2 each etc.. but there's lots of 'buy brand new genuine GM nothing else will doooo' attitude on here, which, to be honest isn't always economical. Again, not knocking those who do. We've all got our preferences and budgets. Some cars are daily drivers, doing 15k a year, other may only do 500miles between MoTs, in which case a cheap-n-cheerful part that'll 'only' last 10,000 miles will last them 20 years... and so on...

[Webby the Bear]

Exactly! And no offence taken btw

Thing is if they failed shortly after..... i'd take the ten mins to put them back. no biggy. but the OE ones were not working for me. i replaced them and now i have no vac leak. simplez