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MG MGF Technical - Removing Exhaust Manifold

After a bit of investigation after some suggestions on here I'm pretty sure my exhaust manifold is leaking.

Having read through the archives the general consensus seems to be that the whole manifold stud will unscrew from the cylinder head rather than the nut. The suggestion was to use a special tool to screw the stud back into the head after seperating it from the nut.

Any recommendations for the tool for this job? I've had a look on Machine Mart but I could only find stud extractors which I think I've got already but nothing for inserting them?

Also whats the chances of shearing the studs? I had to remove an exhaust manifold on a Pug 309 a few years ago and I sheared one off then:-(

Anyone done this or have any special tips (Dave Andrews?). Will they need soaked in penetrating oil 1st?

Whilst I've got the manifold off I'm going to remove the excess internal welds and get it welded externally to strenghten it. Is it OK to weld it with the sensor still in place (as it's a nightmare to remove it I'm told) It's been a while since I've done any welding but I remember there were issues with welding anything with an electrical component in it (i.e. a car) so does the sensor have to be removed before the welding is done?
Bob Millar

On the face of it this shouldnt be too difficult a job..of course it's a pain to get at the exhaust manifold.

If you go to MGR and get the right new bits really you shouldnt have a problem.

Just use two nuts working hard against each other to make a temporary bolt head out of the stud.

When you have the manifold off for the Dave Andrews method clean up + welding event ou will have planty of room to fit the new stud into the hole by screwing in the stud with the temporarily attached two nuts in. Then by the use of two spanners ..or one spanner and a socket separate the two nuts and voila the stud is in the head!

I had a lot of fun with this activity on an old BMW I had last year..it all worked out well after suiable aplication of the wire brush on rusty old stud/nuts once out of the car.

I have never seen a tool other than a stud extractor ...which by the way will utterly mullah the stud in the process of removal.

Neil

ps when welding around the outside be careful not to distort the whole arrangement ...hence do your welding before you get to grinding


Neil

Greg at Tech-speed had this very cool tool - some kind of socket - that allowed him to screw the stud back into the head. Much easier than locking two nuts together...

Sorry can't recall what it was called - but perhaps on the Draper tools website Bob?
Rob Bell

> but perhaps on the Draper tools website Bob

Tried that the other day but it was the trade site and wanted me to register my company details and they would decide if could get in!

Dont think a market research company has much use for tools!
Bob Millar

Oh, I don't know... ;o)

There must be a normal customer site??? Screw Fix is an alternative to try. However, I've just had a look through the printed catalogue (loads of cool stuff), but no stud removal tool :o(
Rob Bell

Try looking at
http://www.machinemart.co.uk/product.asp?p=040210057

Tony
Tony

They're the ones Tony - nice one! :o)
Rob Bell

Thanks guys but I think I've got a set of them somewhere in the garage. It was more a solution for screwing them back in but i think the 2 nut trick should work.

Any opinions on welding with the sensor still in? Will it damage it?
Bob Millar

I don't think so - I recall that Tim had to get his manifold welded up at the Nurburgring, and I don't recall him having any problems with his Lambda sensor.
Rob Bell

Cool
Bob Millar

RE getting the stud back in, you should be able to do it with your fingers, if not then the stud has cross threaded! The socket version of stud remover has a cam arangement and is designed to work backwards as well as forwards
Will Munns

www.draper-direct.com does have a stud inserting tool. I came across it the other day when I flicked through the catalogue, I'll see if I can remember to scribble the part number down tonight.

As Rob says, the Lambda sensor is the issue if you intend to replace the manifold the remove is a bit tricky, however if you intend to reweld then you'll be able to leave the lambda insitu.

Tim
Tim

Draper tool codes:

14156: Heavy duty stud extractor 6-19mm 12.50
55641: 4 Piece stud extractor kit £21.50

Both 1/2" socket

HTH
Tim

Bob, Please let me know how you get on as I have an old vintage MGF and am considering fitting a MS manifold or a super secret one( Kingsley any news?) in the not too distant future.
Have you had any troble with the manifold to cat bolts?

Terry and P323XJR
Terry

This thread was discussed between 23/12/2003 and 24/12/2003

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