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Boring a john deere a block

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john deere a

11-10-2002 13:42:55




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how much can you safly bore a john deere a block? I was told .250 was as much as you could go. that sounded like alot to me.




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Ron

11-10-2002 20:13:31




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 Re: boring a john deere a block in reply to john deere a, 11-10-2002 13:42:55  
A lot depends on the way the block was cast... If there is no "core shift"...you can bore it much more than one that the sand core had shifted-making the cylinder casting off-center... It is kind of " A roll of the dice"... "Do you feel Lucky"..??? I believe that JD only over-bored to +.060...



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MIKE HANLEY

11-10-2002 22:56:08




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 Re: Re: boring a john deere a block in reply to Ron, 11-10-2002 20:13:31  
Ron is correct. Our J.D. dealer will not go over .40 on M to 430. and I think .90 on a Waterloo. Even though there are after market to .120 and more. When we overhauled our 430C a while back they send out the block and had it sleeved back to factory stock rather then go over the .40 that it aready was. They said they have a lot less returns By sleeving and going back to stock. The shop that does all there machine work does the sleeving.

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lynn

11-10-2002 16:36:35




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 Re: boring a john deere a block in reply to john deere a, 11-10-2002 13:42:55  
john deere a..bored my unstyled .375 5 years ago and haven't had any problems pulling it..lynn



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