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MG MGB Technical - MBG Exhaust - Help!

I bought a 1972 mgb roadster.
I need to replace exhaust from manifold back.
The access to down pipe bolds/studs seems unaccessible from bottom. Do I need to take carborators out of the way and go at it from the top? Is this something for an ameture or should I take to shop> I have all the hangers, studs et. Thanks for your help
DT Toms

DT. I have always been able to get to the nuts from the underside, but it is a difficult job, especially if you are working on the car supported on jack stands. Most of the exhaust systems I have used have required additional support, some pipe bending, etc. to make them work most efficiently. Hence, I have a local custom muffler shop do that work. It does not cost a great deal and they have all the necessary equipment, including a lift, to do the job quickly. That makes a world of difference. Les
Les Bengtson

DT,
A really long wrench extension tipped with an angle adapter did it for me - it took way longer than I expected it to, but we did eventually get them all off and then all on again. Les' comment is right on though: after I finished tightening everything I saw that some of the pipes really needed to be re-bent to get the thing to fit, but by the time I'd done those manifold nuts I really didn't have the heart to take them out again. Get a shop to do it.
Adam

Thanks everyone for your input.
I will take to a shop.
Should I paint the down pipe and exhaust with high temp primer and paint to make it look good and keep it from rusting? It's not SS.

I was thinking clean and scuff surface, high temp primer and paint. Is this a mistake?

Thanks for you time and kindness to reply.

Best regards,
Doug
DT Toms

If you do undertake the the job and decide to remove the twin carbs be careful when you part the carbs from the manifold as the linkages tend to separate and you can end up with a nice pile of carbs linkages ect. the first time i undertook this job on my mg i ended up in a mess however it set me up for all those nice future mg repairs
Regards
Richard H
UK



PS why dont you go for a freeflow stainless steel system
Richard H

Go for stainless. Then its one thing less to bother about in the future. My stainless system is 20 years old and the surprising thing is that it would cost the same in pound now as then to replace it.

Tim Wood (TVR 438S)
T Wood 1

I apprciate the value of SS, but I've already purchased the exhaust system in the excitment of my first day working on the car and making a list of first priority items.

Since I don't have SS, is it ok and recommended to primer and paint the non SS system pipes before installing?

Best regards,
Doug
DT Toms

Personally, I'd strip the down-pipe to bare metal, hit it with a prep product like FloQuil and spray manifold paint on it direct. Putting it in an oven (if it will fit and if the missus will let you) helps keep it from getting scuffed off before the exhaust heat can cure it.
Don't expect any paint (no matter what the label says) to do much. It's just too hot for an off the shelf product to work very well.
JetHot coatings and the like are the way to go.

Mike!
mike!

Mike,
I can't buy manifold paint and primer at Auto Parts store? Seems like I seen it up to 500F-600F?

If not, where do I get this JetHot stuff?

Thanks for your time.

Best regards,
Doug
DT Toms

Doug, I am going through the same thing. Replacing a tube header with the early style exhaust manifold and a new system. I bought Duplicolor high temp paint 1200F at Autozone to use on the manifold and pipes. Time will tell how it holds up.
Jethot coating is a process, sometimes available from the same people who offer powdercoating -- depending upon the color it will also change over time.
Regards,
Dennis
D F Sexton

Hello DT,


Even from the top, you won't reach more access to the studs. Provided you have the proper original assembly, from bottom is the best way to gain access to them . recently MGOC offered a kit including longer studs making much easier the deassembling/reassembling process.
Good luck.
Renou

This thread was discussed between 21/09/2004 and 22/09/2004

MG MGB Technical index

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