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Model specific boards => Golf mk4 => Topic started by: markallen on 17 January 2013, 14:59

Title: The blowing is still there after doing this?
Post by: markallen on 17 January 2013, 14:59: Ok so I put some exhaust paste around the downpipe to turbo joint and it made it a little quieter. So order the gasket from VW. Got cracking with it this morning to find that there wasn't even an old gasket there. So put it on and hey presto the blowing is back to the old ways before the exhaust paste! Yes!! So here's a picture of what I did. (http://i751.photobucket.com/albums/xx159/marka22/84A56390-6F89-4D37-A047-FE049CDC7723-2944-000005AD434AF609.jpg)
Does anyone know of any other causes? The turbo to manifold gasket maybe? But why would the blowing be quieter with exhaust paste round the downpipe to turbo joint? Please help as this is now really annoying the shizz out of me!
Title: Re: The blowing is still there after doing this?
Post by: stace110 on 17 January 2013, 18:01: Did you clean all the paste of the two surfaces when fitting the gasket ...?
Im sure your just supposed to use a gasket on its own with no sealant ....I'm interested to know the out come of this as mine is doing the same ...
Title: Re: The blowing is still there after doing this?
Post by: navmk4gti on 17 January 2013, 18:51: Get a sleeve made over it mate. Any exhaut place can do it
Title: Re: The blowing is still there after doing this?
Post by: Chris. on 17 January 2013, 19:08: A sleeve?

Why not just put a VW gasket on and tighten properly?

You still got a cat in? NEVER use exhaust paste before a cat
Title: Re: The blowing is still there after doing this?
Post by: markallen on 17 January 2013, 20:48: Yeah genuine VW gasket and sanded both sides down to remove everything that could get in the way. A hgv mechanic in my local said get two more gaskets and some better paste. Use the paste on the inner lip of the turbo then put a gasket, more paste, another gasket, then paste and fit the downpipe back on?
Title: Re: The blowing is still there after doing this?
Post by: rio_gti on 17 January 2013, 22:56: What :shocked: Does he work in a sandwich shop??!!

Maybe the flange is slightly warped??
Title: Re: The blowing is still there after doing this?
Post by: markallen on 17 January 2013, 23:23: He said take the downpipe off and put it up against some glass or something perfectly flat but I think it welded to the rest of the exhaust. So two gaskets first if not I will check for warping. Then decat if it is :)
Title: Re: The blowing is still there after doing this?
Post by: markallen on 18 January 2013, 08:53: Quote from: navmk4gti on 17 January 2013, 18:51
Get a sleeve made over it mate. Any exhaut place can do it

What do you mean sleeve?
Title: Re: The blowing is still there after doing this?
Post by: Chris#101 on 18 January 2013, 12:52: Are you sure it's blowing from the joint? and hasn't got either a crack on the downpipe weld or a massive crack on the hot side of the turbo? Or you haven't got flat faces on your joints
Title: Re: The blowing is still there after doing this?
Post by: Jin_C on 18 January 2013, 13:30: Depending on how loud the blowing is have you checked the manifold to turbo gasket? I had one of the 3 bolts work itself loose when a mechanic didn't use loctite.

Also could possibly be cracked turbo housing or manifold. Or even manifold to head.

When the car is completely cold turn it on and put your hand down there (I would say wet your hand a little to help but in these temps you might lose a finger or two) and have a feel for where the air is coming from.
Title: Re: The blowing is still there after doing this?
Post by: markallen on 18 January 2013, 13:48: Quote from: Chris#101 on 18 January 2013, 12:52
Are you sure it's blowing from the joint? and hasn't got either a crack on the downpipe weld or a massive crack on the hot side of the turbo? Or you haven't got flat faces on your joints

If it was either of these why would it sound better with paste around the joint? :huh:
Title: Re: The blowing is still there after doing this?
Post by: rio_gti on 18 January 2013, 14:19: Also I thought about a crack but in theory when it gets hot shouldn't the metal expand and the blowing get quieter??
Title: Re: The blowing is still there after doing this?
Post by: Jin_C on 18 January 2013, 14:24: Quote from: markallen on 18 January 2013, 13:48
Quote from: Chris#101 on 18 January 2013, 12:52
Are you sure it's blowing from the joint? and hasn't got either a crack on the downpipe weld or a massive crack on the hot side of the turbo? Or you haven't got flat faces on your joints

If it was either of these why would it sound better with paste around the joint? :huh:

Could it be because that it is blowing from two places. When you fix the downpipe joint you can hear the quieter one but before, the downpipe is drowning out the other gap
Title: Re: The blowing is still there after doing this?
Post by: markallen on 18 January 2013, 14:30: I guess I can only try and fix the joint first and then see what happens. Will update tomorrow when I've done it.
Title: Re: The blowing is still there after doing this?
Post by: Wazzzer on 18 January 2013, 14:59: Like Chris said you definitely shouldn't be using paste for any joint before the cat
Title: Re: The blowing is still there after doing this?
Post by: markallen on 18 January 2013, 15:06: Why though?
Title: Re: The blowing is still there after doing this?
Post by: stace110 on 19 January 2013, 10:36: If you use the paste between the two flat surfaces ,The excess on the inside of the downpipe could break off and slightly block/damage the cat .
Title: Re: The blowing is still there after doing this?
Post by: markallen on 19 January 2013, 10:40: If I do and it sorts the blowing I will get a new downpipe without a cat anyway. It's just to try and source the blowing issue it's not going to be a forever job.
Title: Re: The blowing is still there after doing this?
Post by: golfyste on 19 January 2013, 18:14: Just change it all!
Uprated turbo and exhaust ..... Sorted :grin:
Title: Re: The blowing is still there after doing this?
Post by: markallen on 20 January 2013, 00:15: Quote from: golfyste on 19 January 2013, 18:14
Just change it all!
Uprated turbo and exhaust ..... Sorted :grin:

I would but your shying away from fitting it all ;) ha ha
Title: Re: The blowing is still there after doing this?
Post by: golfyste on 20 January 2013, 11:53: I would.....but it's a bit snowy outside to do a turbo! Haha
Title: Re: The blowing is still there after doing this?
Post by: pickles on 20 January 2013, 12:31: buy a gazeebo :laugh: