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  1. #1
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    Core Removal on Allison

    wanting some tips on what methods and tools are needed to remove balsa core.thx also just found some faxtory holes in hull!!!1/4" holes from the inside walls to floor panels. they holes match exactly to the ones in the panels.best way to fix.i have my idea,always listening to others ideas.
    Last edited by J.R.; 03-17-2017 at 05:53 PM.

  2. #2
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    Tyvec suit, dust mask, various implements of mass destruction. It really depends on what shape the core is in as to how you remove it. If it's totally rotten you can sweep out the remnants with a broom and dust pan. If it's still pretty solid you may have to cut a cross hatch in it with a circular saw (careful with the depth so you don't cut through the hull) and wreck it out with hammer, chisel, pry bars, cuss words, adult beverages, etc....

    Good luck and post pics!
    Josh Peterson

  3. #3
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    Never again will I use a circular saw on a hull that I am not cutting up for trash. Hammers, chisels, and pry bars have their place but make it extremely easy to damage the outer skin, especially on one with a light mold form like an Ally. Tool of choice would be something like a versa-tool (oscillating cutter) with carbide saw blade. Cut as close to the hull as possible because what is left will have to be sanded/ground out. I use a small 4" grinder with with usually a 30g disc. If you make divots in the hull during the grinding, I would first apply a skim coat of putty to create a level and even surface to begin re-coring from.
    Speed cost money. How fast you wanna go?
    I have done so much with so little for so long, I can now do the impossible with nothing!

  4. Likes W2F a V-King liked this post
  5. #4
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    Some guys have had good luck with a looonnnnngggg blade on a reciprocating saw too...

    You will just have to play around and find something aggressive enough to work without damaging the outer skin of the hull!
    Josh Peterson

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  7. #5
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    Quote Originally Posted by nitro_rat View Post
    Some guys have had good luck with a looonnnnngggg blade on a reciprocating saw too...

    You will just have to play around and find something aggressive enough to work without damaging the outer skin of the hull!
    yep.....just be carefull ! worked good for me.
    found one made for the emrgency rescue industry, 14" long and cobalt .......low tpi count is better.
    the more flexible the better.

  8. #6
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    Once you get the big stuff out a wire cup brush on a 4" angle grinder works good for the final clean up.
    Josh Peterson

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  10. #7
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    Have lived and worked in New Zealand ,Tahiti,Australia,Japan , south Korea, And now Suzhou in China
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    any photos ? would be good for others to see what's happening and how you doing it !!
    Last edited by tunnels; 03-16-2017 at 07:00 PM.
    Messing round with boats is fun !! the learning never stops ,even after more than 30 years there's always something new happening somewhere ! BUT somethings never change and some problems never go away and just keep reoccurring !!so moved into Composite Forensics , Now that something completely new !!

  11. #8
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    I used a home made chain saw disk on a 9" grinder works great. King Arthur tools sells a small one but you'll only be removing ~2" Strips at a time. I also used Milwaukee pruning sawsall blades 5 teeth per inch, specifically Milwaukee others are similar but the blades broke 10x faster. I would stay away from any pry bars and hammers you will cost yourself more time and money than you save. I was removing a fairly solid core it was just waterlogged. Click image for larger version. 

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  12. #9
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    Man what a headache, might have to tackle a job like that this spring.

  13. #10
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    sorry for no pics,dont have the know how. I have made good progress with a oscillating multi tool with the "JAPAN" style wood blade .pretty aggressive teeth 12 teeth per inch.the core is water logged from the previous owner drilling 1/4$" holes all the way thru the hull!!!.1/3 the way done on the core removal.did not really want to go into floatation boxes at the rear,but there are some questionable spots.still on fence as to wat core replacement material I waill use.I know balsa is great,but I am leaning twards something that will never "ROT'

  14. #11
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    IMO remove the flotation and throw it away
    Speed cost money. How fast you wanna go?
    I have done so much with so little for so long, I can now do the impossible with nothing!

  15. #12
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    Quote Originally Posted by J.R. View Post
    sorry for no pics,dont have the know how. I have made good progress with a oscillating multi tool with the "JAPAN" style wood blade .pretty aggressive teeth 12 teeth per inch.the core is water logged from the previous owner drilling 1/4$" holes all the way thru the hull!!!.1/3 the way done on the core removal.did not really want to go into floatation boxes at the rear,but there are some questionable spots.still on fence as to wat core replacement material I waill use.I know balsa is great,but I am leaning twards something that will never "ROT'
    Core cell !! and don't look any further!! what is going over the top of the core in the way of glass???
    Last edited by tunnels; 03-17-2017 at 09:06 AM.
    Messing round with boats is fun !! the learning never stops ,even after more than 30 years there's always something new happening somewhere ! BUT somethings never change and some problems never go away and just keep reoccurring !!so moved into Composite Forensics , Now that something completely new !!

  16. #13
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    The alternatives may not rot but can become waterlogged, so workmanship is key.

  17. #14
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    Quote Originally Posted by Gmcviper View Post
    I used a home made chain saw disk on a 9" grinder works great. King Arthur tools sells a small one but you'll only be removing ~2" Strips at a time. I also used Milwaukee pruning sawsall blades 5 teeth per inch, specifically Milwaukee others are similar but the blades broke 10x faster. I would stay away from any pry bars and hammers you will cost yourself more time and money than you save. I was removing a fairly solid core it was just waterlogged. Click image for larger version. 

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ID:	369854Click image for larger version. 

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    My new favorite zombie apocalypse weapon.

  18. #15
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    I used the King Arthur lance-a-lot on my core removal with very good, fast results.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

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