Author Topic: McCulloch resleeve  (Read 1269 times)

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Offline Al Smith

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McCulloch resleeve
« on: November 02, 2014, 09:15:19 pm »
This is kind of a repeat I'd done before .I was asked my a member to show it again .

The subject is a Mac 125 the chrome had delaminated .I chose grade  50 grey cast iron for the material for two reasons .It machines easily plus it's the samegrade of cast iron  Harley Daividson used on iron cylinders .

I bored the block 70 thou over ,machined the sleeve for a heat shrink fit of 2 -2.5 thou over following the rule of thumb of 1 thou per inch of sleeve on a heat shrink fit .

The sleeve was cored out from a 3" chunk of fine grade cast I got from Mc Master -Carr .
I left it about 2 thou undarsized incase of warpage or distortion and final honed it to a fit of 4.5 thou larger than the piston skirt .

The ports were cut in after the sleeve was pressed by leaving the welch plugs out .That wasn't a big deal nor was the rest .The time was building the holding fixture to hold the block and making the boring bar for the Bridgeport milling machine .

It took me 2 hours to tram the mill in to get it pefectly in alignment to bore the block and about 15 minutes to do the job .

It came out fine ,runs fine .I have not ran that saw even enough to seat the rings since I did the rebuild .

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Offline 660magnum

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Re: McCulloch resleeve
« Reply #1 on: November 02, 2014, 10:22:48 pm »
Good job - The 125 is a beast
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline neil

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Re: McCulloch resleeve
« Reply #2 on: November 03, 2014, 12:48:23 am »
Well thanks very much for that.
I'm not sure if i'm up to that level with the lathe, but thats given me an idea on how to start at least thinking about doing it.

Offline Al Smith

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Re: McCulloch resleeve
« Reply #3 on: November 03, 2014, 07:24:36 am »
I might add my method was just one of many options .I also imagine that if a person looked at LA Sleeve company that a ready made spun cast sleeve could be adapted .

Now I've seen rather ingenious   holding devices for cylinders used in a lathe .Randy of "mastermind " fame showed one and Dennis Cahoon had another one .The reason I used a device bolted on the side of the cylinder was because to me it appeared to be the most simple method at the time .

Offline aclarke

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Re: McCulloch resleeve
« Reply #4 on: November 03, 2014, 09:05:57 am »
Looks good Al. Thanks for posting that...

Offline Uncle Lee

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Re: McCulloch resleeve
« Reply #5 on: November 06, 2014, 07:25:29 am »
Al, I am having my machine shop do a block for me. It's a 101B block with
removable head so it will be much easier. He has found a sleeve already
so as soon as i get off my but and give him the block i can get it done.
Mine is originally a cast bore but the motors wrist pin moved and out came
the needle bearing for the wrist pin. Made a mess of the bore.



Lee

Online srcarr52

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Re: McCulloch resleeve
« Reply #6 on: November 06, 2014, 10:11:34 am »
L.A. Sleeve will probably has sleeves for about any application, I think they are the largest sleeve manufacture.  If not they can make one and I'm sure it would be cheaper than a solid chunk of cast.

Offline aclarke

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Re: McCulloch resleeve
« Reply #7 on: November 06, 2014, 11:28:15 am »
Anyone have thoughts on minimum wall thickness for a hotsaw application?

Online srcarr52

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Re: McCulloch resleeve
« Reply #8 on: November 06, 2014, 12:26:09 pm »
Anyone have thoughts on minimum wall thickness for a hotsaw application?

It all depends on the amount and type of supporting material.  I've seen sleeves sub of 0.060" if there is ample supporting material.  You can also go thinner on steel sleeves than cast.

Offline Uncle Lee

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Re: McCulloch resleeve
« Reply #9 on: November 06, 2014, 01:05:34 pm »
I've got a Mac 797 that was already at .070 over when i restored it. Not much cast
left in that saw. Thank god the piston was still in great shape. I've also heard that
back in the day folks were boring 101 kart blocks .100 over. That cast bore was
extremely thin. But anything goe's to win a race.




Lee

 

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