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
Exhaust manifold
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Topic author - Posts: 148
- Joined: Tue Mar 21, 2017 7:58 pm
#2 Re: Exhaust manifold
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.
I ve fixed mine on the engine in place in the engine bay that way.
Le chemin sera long!...
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#3 Re: Exhaust manifold
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
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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Topic author - Posts: 148
- Joined: Tue Mar 21, 2017 7:58 pm
#4 Re: Exhaust manifold
Today I received new manifolds from SNG.
Now I‘m confused because the new ones have much bigger threats for the heatshield 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 manifolds?
Best regards
Sven
Now I‘m confused because the new ones have much bigger threats for the heatshield 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 manifolds?
Best regards
Sven
Sven
'71 S3 coupe LHD manual
'71 S3 coupe LHD manual
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#5 Re: Exhaust manifold
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
Regards Rob
Rob 1972 s3 roadster
Aston Martin DB9 Volante
Aston Martin DB9 Volante
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#6 Re: Exhaust manifold
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
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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#7 Re: Exhaust manifold
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
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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Topic author - Posts: 148
- Joined: Tue Mar 21, 2017 7:58 pm
#8 Re: Exhaust manifold
Thank you for your advice
Sven
Sven
Sven
'71 S3 coupe LHD manual
'71 S3 coupe LHD manual
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