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McCulloch resleeve

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Al Smith:
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 .

660magnum:
Good job - The 125 is a beast

neil:
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.

Al Smith:
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 .

aclarke:
Looks good Al. Thanks for posting that...

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