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XT cylinder head - exhaust flanges corroded in.. XT cylinder head - exhaust flanges corroded in..
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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The Pamir highway in an unseasonably
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  #1  
Old 1 Jul 2013
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XT cylinder head - exhaust flanges corroded in..
Hi..can anyone help me with my problem please?

I have an '03 XT which I've stripped to rebuild as my next travel bike.. I have the engine out but the exhaust flanges have corroded in and snapped off the rest of the headers as I removed them.

They are properly corroded in and the extreme heat has left then in a sorry state...

Any ideas how to get them out? I don't want heat them up too much as I fear warping the whole alloy head..I've tried using cutting discs on a dremmel, grinders, drifts... but no joy and it's starting to look messy

Short of setting the head up on a mill and I'm stuck for ideas.. any help gratefully received.

Failing that.. does anyone know of a 4PT head with or without valves and camshaft going for sale? Am I right in thinking any head from 2KF is a match??

Thanks.
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  #2  
Old 1 Jul 2013
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Seized items; Wurth make an excellent product, Rost-off. Apply and leave to soak.
Then; mass and shock are your next good friends. Mass because there is no shock when striking a light item.
Back-up the item containing seized part using appropriate mass like lead weight, sand or similar to avoid damage, and strike seized part with pin punch or similar.
Weight of hammer, size/shape of punch, level of enthusiasm of striker subject to experience.
The idea is to break the bond between the two surfaces.
Loosens almost anything.
Heat, depending on materials, should be last resort.
p
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Old 1 Jul 2013
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It's a common XT600E problem.

Tiny headers made of steel in an alloy head..

I had exactly the same situation.

Now, how much of the header is left in the head ???

Is there enough to weld a nut onto ?? That's pretty much the only way they're coming out if they're REALLY rusted in there. The weld will get it stinking hot and you can usually work them out.

If not then you're best off giving the head to a workshop who can can drill out the old studs and put some proper threaded inserts in for you.

Unless you have the equipment to do that yourself.

And that equipment ISN'T a 9V Cordless drill and some cheap drill bits either
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Old 2 Jul 2013
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If I am reading the OP right, he isn't struggling with the studs. He is struggling with the thick ends of the header that the clamps fit on. It sounds like the headers broke and left those in.

Either way I think it is machine shop time if this head is to survive. It is worth getting a price at least.

Sorry, I can't help with the questions about another head.
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Old 2 Jul 2013
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Thanks for the advice. It is the very ends of the pipes that have corroded off and left the thick tapered flange ends in the exhaust holes in the head.
I can get to a milling machine but it's a long time since I used one... so my next issue is setting up the head at the correct angle to remove the steel but not touch the alloy.. tricky because of the taper I suspect..

Should it come to buying a replacement head does any head from 2KF model onwards fit? It looks like it from all the ones I've seen online. Seems there is an extra stud atone end of the camchain cavity...?! Am I right with this??

Thanks again for the assistance.. I'll keep plugging away

LBR
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Old 2 Jul 2013
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Well, you do know how how that sh*t goes when the engine is hot right!?

In my professional opinion welding anything that close to the inside of the engine you'll get spatter or even some rust inside the engine whether you like it or not. So unless you got a few cm outside the engine don't weld anything in there!


Vando
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Old 2 Jul 2013
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Hi

I had the same trouble as you and after struggling with the remnants of the headers and exhaust studs for ages I gave up and gave the head to a mechanic at work. He struggled with the headers but got them out eventually using heat and brute force. He couldn't do anything about the studs though and I had to drill them out and re tap myself. None of this helps you of course, except to say it can be done! so hang in there and good luck!

Bill
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Old 3 Jul 2013
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If it were me I would either
a) plug the ports & use a die grinder or dremell & grind almost through the pipe/flange at one point from the inside. Then colapse the pipe/flange & remove it.
or b) if you have access to a arc or mig welder, plug the ports & grind the inside of the pipe/flange until shiny/clean bare metal is showing. Then weld a bead around the inside of the pipe/flange & allow to cool. When the weld cools & contracts it will also contract(shrink) the pipe/flange allowing it to be removed. The risk here is if your weld penetrates through the pipe/flange, it might make it harder to remove, so it really depends how thin or rusted the pipes/flanges are & how good at welding you are.
Good luck
Bob
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Old 3 Jul 2013
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Post a picture of the issue already!!
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Old 3 Jul 2013
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Surprised Mezo (our resident Aussie) hasn't seen this thread, he's pretty clued up on all mechanical things XT.

For what it's worth, I have heard of this same problem many many times in the past.
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Old 3 Jul 2013
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I am with Bobmech's suggestion a). If you can grind or mill a slot in the flange I think you could use a big screwdriver to collapse it in on itself.
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Old 3 Jul 2013
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As long as it doesn't collapse inside the engine block! lol :P

Mezo has probably seen the post already, or he's been away for a few days..
He always has a trick up his sleeve!
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Old 3 Jul 2013
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I'll sort the whole thing out for you for £100. Flanges removed, studs out and new ones fitted..

And if I can't, no fee !!!

However, Why not have a go yourself first.... it will be a learning experience.

Heads are rare and expensive and a second hand one could be in worse shape than yours.

It might already be beyond reasonable repair. Please post some pictures up of the head from multiple perspectives.

Ted

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Old 4 Jul 2013
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I'll try to post some pics this evening... Thanks for all the help..
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Old 4 Jul 2013
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Quote:
Originally Posted by lowbudgetrider View Post
I'll try to post some pics this evening... Thanks for all the help..
Were waiting
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