Exhaust manifold

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baganz.sven@web.de
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#1 Exhaust manifold

Post by baganz.sven@web.de » Sun Jun 09, 2019 4:11 pm

Dear forum colleagues,

I have just found a cracked exhaust manifold on my car. I have already read an older post by Marek to replace pairs with those from new production.

One question. Can I replace them wirh the engine in the car or do I have to take the engine out?

Best regards
Sven
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Sven
'71 S3 coupe LHD manual

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MLBS3V12
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#2 Re: Exhaust manifold

Post by MLBS3V12 » Sun Jun 09, 2019 5:51 pm

Not easy to do on the car but possible if you lift a bit the engine.
I ve fixed mine on the engine in place in the engine bay that way.
Le chemin sera long!...

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MarekH
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#3 Re: Exhaust manifold

Post by MarekH » Sun Jun 09, 2019 7:36 pm

Because they are bolted in tight at the top, if the mounting flanges are very different thicknesses, then the downpipe will not line up well when viewed front to back and that is where you have a problem making sure you don't foul the engine frames. You may find you have no problem, but you may equally find you do. If you have two manifolds made to the same dimensions and thicknesses, then you have more chance that everything will fit together well.

If the manifold easily breaks into pieces, it'll be easier to take off of the car.

There is already plenty posted elsewhere about how to do this job if you review the archives here and on jag-lovers.com

kind regards
Marek

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#4 Re: Exhaust manifold

Post by baganz.sven@web.de » Tue Aug 13, 2019 8:02 pm

Today I received new manifolds from SNG.
Now I‘m confused because the new ones have much bigger threats for the heatshield :seeingstars: screws.
Is this correct?
Seeing that there are different heatshield I‘m now afraid that my old parts will not fit (I can‘t try at the moment) and that I will not find a later heatshielt.

Did you have same problems when replacing the :helpsos: manifolds?

Best regards
Sven
Sven
'71 S3 coupe LHD manual

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madjack4
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#5 Re: Exhaust manifold

Post by madjack4 » Tue Aug 13, 2019 9:07 pm

Hi i fitted 2 manifolds recently i drilled out heat shields and fitted larger diameter bolts To remove manifolds undo engine mount on that side jack up engine be careful not to damage sump and they come out not easy very tight
Regards Rob

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gehawe
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#6 Re: Exhaust manifold

Post by gehawe » Wed Aug 14, 2019 5:37 am

Hi Sven,
My car got 2 new manifolds recently, done by Peters in Rödermark.
They told me that during an exchange of the old manifolds, most likely a few stud bolts (Stehbolzen) will break and you have to drill them out. For that job, you will need a drill template, otherwise you risk to land up in the cooling water.

I am most positive, that they did not take the engine out, otherwise I would have a much longer bill.

Good luck

Gerhard
Home of the Blue Lucy - Series 3 OTS

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MarekH
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#7 Re: Exhaust manifold

Post by MarekH » Wed Aug 14, 2019 8:19 am

The larger diameter thread to mount the heat shield to the manifold was introduced when exhaust gas recirculation was added as part of the US emissions package. The earlier thinner manifolds are no longer avalable so all replacements have the larger diameter threaded holes for the heat shields.

The threads in the block (to mount the manifolds to the block) remained the same pre and post emissions changes.

If you break a stud during removal, then MIG welding a nut onto it will probably be the best solution. I doubt you'd go through to the water jacket. If you look at the geometry, you'll see there is plenty of space there.

kind regards
Marek

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baganz.sven@web.de
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#8 Re: Exhaust manifold

Post by baganz.sven@web.de » Wed Aug 14, 2019 9:14 am

Thank you for your advice :thankyouyellow:
Sven
Sven
'71 S3 coupe LHD manual

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