Who's had the best luck repairing broken fins? (2006)

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I was thinkin of using some JB Weld. Kinda ghetto, but it may work What say you??
 
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It depends on which fin is broken the head or barrell. I have had good luck brazing fins back on the barrel. Cast iron is difficult to weld as it is quite brittle so brazing seems to work quite well here. With cylinder head fins a competent alloy welder should be able to do the job fairly easily. If the fin in question is not a top or bottom fin you may have to break off an adjacent fin to get access for reattachment.
 
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Yeah, I was thinking of either trying to tac it back on, or just break off the same fin on the other side and cleaning them up. It's a head fin.
 
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74cafe said:
just break off the same fin on the other side and cleaning them up

That's an interesting idea. I have a Combat head with one broken fin and I do not have the broken piece. It's the small fin on the side, and as luck would have it, the top fin.

Alternatively, is there someone I can send the head to, so a new fin can be fabricated and installed? Or is taking a hacksaw to the other side a better idea? :shock:

Debby
 
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Broken aluminum fins can be successfully repaired by using a heliarc weld process followed by skillful shaping and contouring of the repair with a file.
 
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I seen hucksters hawking this rod at car, bike and boat shows for years.. Big deal - you can repair a soda can!!

BUT wait, there's MORE... that video is incredible!
If it's all true this stuff has real value! I will be the first on my block to buy some if anyone of our good friends out there confirm they have had the same results.. I've fins, cases, brackets screaming for help..

oh my gosh!

http://aluminumrepair.com/video_new.asp

Thanks for the tip L.A.B. !!
 

L.A.B.

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I've been using Lumiweld for years and that has worked on EVERYTHING (alloy) I have tried it on so far!

I was under the impression that HTS-2000 was an improved type? (I have bought a kit but not needed to use it yet) but unless you try it you will never know?

Obviously the results will depend to a certain extent on the ability of the user.
 
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Yes Sir, oh SO true..

I have been know to say of myself,
"I might not be that great, but I do TRY hard"

AllRightyThen.. Thank you SO much... oh boy New Toys!
 
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Debbie, If the piece of fin is missing you can get a completely trashed head and break a piece of fin off about the same size as the missing piece and then trim it to fit prior to welding. You should probably be able to use any alloy head or barrel for harvesting your fin bits not just Norton. A session with a dremel followed by bead blasting should render the repair almost invisible.
 

MCP

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I've been using Lumiweld for years and that has worked on EVERYTHING (alloy) I have tried it on so far!

I was under the impression that HTS-2000 was an improved type? (I have bought a kit but not needed to use it yet) but unless you try it you will never know?

Obviously the results will depend to a certain extent on the ability of the user.
I have a chip in my head fin, and a local welder said he can't repair it. ( I don't have the broken piece) Do you think Lumiweld could be used for this, build it up slowly? My concern is that I add to much heat to the head and I'm not sure how sensitive the head is to over heating. Thanks for any experience you can add to this.
 

L.A.B.

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I have a chip in my head fin, and a local welder said he can't repair it. ( I don't have the broken piece) Do you think Lumiweld could be used for this,

I've never tried a repair on such a large casting as a cylinder head.
It would certainly need a lot of heat which might not be good for the head unless the heat could be mostly contained in the area of the broken fin as the head would rapidly conduct the heat away.

build it up slowly?

The problem with building it up is the first layer of Lumiweld/HTS/whatever would melt as the second was applied so needs to be done in one go. I think you would probably have to 'cast' the missing section of fin using stainless steel sheet metal to form a 'mould' as demonstrated below...
Who's had the best luck repairing broken fins? (2006)
 

MCP

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I've never tried a repair on such a large casting as a cylinder head.
It would certainly need a lot of heat which might not be good for the head unless the heat could be mostly contained in the area of the broken fin as the head would rapidly conduct the heat away.



The problem with building it up is the first layer of Lumiweld/HTS/whatever would melt as the second was applied so needs to be done in one go. I think you would probably have to 'cast' the missing section of fin using stainless steel sheet metal to form a 'mould' as demonstrated below...
Who's had the best luck repairing broken fins? (2006)
Thanks for the input
 

lcrken

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I've repaired a couple of Commando heads with broken fins by tig welding a replacement piece on. Both were on top fins, so welding access was not a problem. I used 4043 rod with good results, but have been told that 4047 might be slightly better because of its higher silicon content. In both cases I cut the replacement out of aluminum sheet, but you would probably have a more original look if you could use a matching piece from a junk head. That's what I'm planning to do with the current 750 head I'm working on.

Ken
 
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