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Old 05-28-2013, 02:08 PM   #1
jpbellavance OP
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Broken Off Channel Opening Where Cylinder Head Screw Goes Through

I recently bought a 1986 R65 BMW. When I went to adjust the valves I noticed that the previous owner had done a fix to his right cylinder head nut channel so that I assume oil would not leak out of it. It was basically a high heat type of gummy substance that would not detoriate and allow oil to pass through the channel.

I wanted to replace the gaskets on the cylinder head and this gummy stuff had to come off. The question I have is what type of gummy stuff do you think was used to create the seal. Or what should I use to create another temporary seal.

Or are there other solutions out there I could try without buying a whole new cylinder body?

Thanks in advance for any help. Attached is a pic of what I have to work with.
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Old 05-28-2013, 02:19 PM   #2
Big Bamboo
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I would try using a copper washer and self locking nut on the stud first.
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Old 05-28-2013, 02:49 PM   #3
Airhead Wrangler
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get someone to build up aluminum again with a welder. It wouldn't take long at all to build it up and file and then sand it flat again.
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Old 05-28-2013, 03:48 PM   #4
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Quote:
Originally Posted by Big Bamboo View Post
I would try using a copper washer and self locking nut on the stud first.
Would this create a seal? If so how? Thanks. I like this idea but was hoping you could elaborate on it a bit.

Thanks,
JPB
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Old 05-28-2013, 04:13 PM   #5
disston
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The welded with Aluminum is the best idea. There are a number of fair welders around that can do this but maybe more volunteers than those capable. Try to get a reference. I really think you might get it done cheaper than you think but you are going to have to do the filing part and it will require a pretty large quality file to do right.

In lieu of the quality Aluminum repair, how are you with forming epoxy? This would work too.
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Old 05-28-2013, 04:30 PM   #6
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JB Weld. I do it again. Which is basically what disston said but omitted the brand name.
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Old 05-28-2013, 04:38 PM   #7
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If it was my bike I'd have it welded then re-faced.If you aren't confident enough to use a file to clean the face have a machine shop do it,shouldn't be too expensive.
If you dont want to go that route you could use J-B Weld,many have fixed bigger problems with it.I prefer the stick over the epoxy.

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Old 05-28-2013, 05:17 PM   #8
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Quote:
Originally Posted by jpbellavance View Post
I recently bought a 1986 R65 BMW. When I went to adjust the valves I noticed that the previous owner had done a fix to his right cylinder head nut channel so that I assume oil would not leak out of it. It was basically a high heat type of gummy substance that would not detoriate and allow oil to pass through the channel.

I wanted to replace the gaskets on the cylinder head and this gummy stuff had to come off. The question I have is what type of gummy stuff do you think was used to create the seal. Or what should I use to create another temporary seal.

Or are there other solutions out there I could try without buying a whole new cylinder body?

Thanks in advance for any help. Attached is a pic of what I have to work with.
That doesn't lake any pressure so there is a quick easy repair that will last forever.

First get the gummy stuff off and completely clean and roughen the metal. A small ball cutter in a dremel will work well, just go over the area with the ball exposing fresh metal.

Now you need a bolt that will go through the head, a pair of regular washers, a fender washer and some wax. Wax up the shank of the bolt and the fender washer. Two coats with drying in-between. Then you need some JB weld. Plenty strong and good adhesion. Mix it up and apply to the area so it's nice and high everywhere. Now put a washer on the waxed bolt, then the waxed fender washer and stuff it in from the outside, then another washer and the nut. Tighten the nut hand tight---just enough to get that fender washer seated on the head surface with no JB weld between it and the good sealing surface.

let it harden well then pop out the bolt and washers. You will have molded a new sealing surface that matches the existing. Clean up as needed and It's done.
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Old 05-28-2013, 05:19 PM   #9
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My /7 came with that situation repaired w/ JBweld. I've had it for several years w/ no issues. No idea how long it was repaired before my tenure but, based on the general lack of maintenance, probably quite a while.
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Old 05-28-2013, 05:26 PM   #10
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Thanks all for the great suggestions! I will let you know how it all works out. Again. Thanks!

JPB
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Old 05-28-2013, 08:16 PM   #11
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If you're just looking for opinions,...... leave it alone.

If it leaks oil on the back side, fit a fiber washer under the nut and washer. You will be able to ride it for miles and miles even years and years without any trouble. The next time the heads are off for a re-build, have the head welded and re-surfaced. Until then, it's not hurting a thing.
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Old 05-28-2013, 08:44 PM   #12
Kai Ju
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Quote:
Originally Posted by Pokie View Post
If you're just looking for opinions,...... leave it alone.

If it leaks oil on the back side, fit a fiber washer under the nut and washer. You will be able to ride it for miles and miles even years and years without any trouble. The next time the heads are off for a re-build, have the head welded and re-surfaced. Until then, it's not hurting a thing.
Pokie's solution is the simplest and likely will work just fine with the fiber washer sealing the oil in.
Should you choose Plaka's method make darn sure that none of the aluminum ends up in your valvetrain to be washed into the engine through the pushrod tubes.
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Old 05-28-2013, 08:54 PM   #13
Plaka
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Originally Posted by Kai Ju View Post
Pokie's solution is the simplest and likely will work just fine with the fiber washer sealing the oil in.
Should you choose Plaka's method make darn sure that none of the aluminum ends up in your valvetrain to be washed into the engine through the pushrod tubes.
I'd pull the rockers and pushrods, stuff the holes then flush very well after the epoxy work and any final grinding or filing..especially around the springs.
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