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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Exhaust manifold removal (550) - advice?

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Chris Vyver

09-22-2007 07:44:14




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I have successfully replaced all the electrical components on my 1959 Gas 550 including changing -ve ground back to +ve. It fired up first time perfectly. Thanks to all those that helped with advice.

OK - now onto a carb rebuild (idling cycles up and down) and...

Anyone have advice on removing an old and pitted manifold? It has leaks, especially at the point the exhaust manifold extension elbow attaches. I have fears of sheared bolts and the hassle that entails. They do not look like they have been removed in a very long time.

The part number for that elbow gasket is 1E-424. I cannot find one from Agco, and the one that has failed is obviously home-made (badly). So, does anyone know where I can get this?

Many thanks, Chris

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Kruse

09-22-2007 15:24:19




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 Re: Exhaust manifold removal (550) - advice? in reply to Chris Vyver, 09-22-2007 07:44:14  
Everybody has their own method for removing sheared off exhaust/intake bolts. Most of them are real good and it"s just a matter of personal preferance. Here"s mine: If you have an exhaust manifold shear off flush with the head, weld a washer to the sheared off bolt. Then weld a nut to the washer. Usually with the combination of the heat and a little patience, it will come out with a wrench or a socket. Of course if that doesn"t do it, get the drill and the tap.

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Chris Vyver

09-22-2007 16:43:54




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 Re: Exhaust manifold removal (550) - advice? in reply to Kruse, 09-22-2007 15:24:19  
re. the welding washer and nut. That's a great idea. Thanks everyone. I will let you know how I get on...maybe share photos...if it goes badly though, don't expect anything ;-)



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J Schwiebert

09-22-2007 09:33:03




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 Re: Exhaust manifold removal (550) - advice? in reply to Chris Vyver, 09-22-2007 07:44:14  
I would try the bees wax trip to remove the studs.



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havvey

09-22-2007 08:50:22




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 Re: Exhaust manifold removal (550) - advice? in reply to Chris Vyver, 09-22-2007 07:44:14  
Just did my head, You can cut the heads remove manifold heat the studs and remove then. There are several stud removal tools. Yes some times they have to be drilled out.



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Chris Vyver

09-22-2007 09:05:10




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 Re: Exhaust manifold removal (550) - advice? in reply to havvey, 09-22-2007 08:50:22  
Thanks Havvey.
What is the best technique for drilling them out, assuming that I will not be using a drill stand ;-)



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Chris Vyver

09-22-2007 07:49:06




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 Re: Exhaust manifold removal (550) - advice? in reply to Chris Vyver, 09-22-2007 07:44:14  
Just an idea. Some of the bolt heads are so worn, I think a spanner will slide around them. Is there any sense in cutting the heads off - removing the manifold - THEN trying to get the bolts out with a wrench and lubricating oil?



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RAB

09-22-2007 10:52:10




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 Re: Exhaust manifold removal (550) - advice? in reply to Chris Vyver, 09-22-2007 07:49:06  
Best sense is to take out any that are removable. It is a matter of feel whether they are going to turn or break!
All the bolts left in will mean the manifold will have to be removed over them and may make things harder if they are all there. It is surprising how easy they will shift, if they are not full of rust in the manifold holes. Sometimes tapping the heads from side to side can help to free things up inside the manifold holes, if they will move at all. I know, very easy to break them off too!

Using release agents rather than lubricating oil is better for starting them moving, then lubricate to remove and a stud remover is better as it will turn square with the head.

If you have any to drill out, start very carefully with a small pilot drill bit to make sure you are exactly centred on the bolt and straight. Then use another bit, big enough so as not to break easily in the hole (harder work removing HSS bits) to adjust the pilot hole to centre and then drill deeper.
Enlarge until thinnest side just about starts drilling into threads. You should then be able to remove it easily.

Proceeding slowly and carefully is much preferable to getting it wrong.

It gets easier with practise and confidence.

Regards, RAB

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