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John Deere Tractors Discussion Forum
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720 into 70

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bassndeere

11-01-2006 18:00:45




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Can I use standard 720/730 LP pistons in my 70 LP with a .125 over bore? Will the wrist pins work? Is there a better way? Thank you




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bassndeere

11-02-2006 18:31:20




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 Re: 720 into 70 in reply to bassndeere, 11-01-2006 18:00:45  
Thanks for everyone's help. The wrist pins answered my question. The JD house tell's me thay cannot get any pistons for the 70 or 720/730. Looks like aftermarket or used. Thanks again.



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430WLPG

11-02-2006 16:18:06




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 Re: 720 into 70 in reply to bassndeere, 11-01-2006 18:00:45  
Wrist pins Won't work, the 720 pins are a huge 2-3/8" and the 70 are 1-1/2".



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buickanddeere

11-02-2006 08:17:24




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 Re: 720 into 70 in reply to bassndeere, 11-01-2006 18:00:45  
You could just ask the pulling boys on this site. These is a shop that bores G & 70 blocks and braze in sleeves. 6.75" bore, no problem. Price is reasonable too.



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bassndeere

11-04-2006 19:01:16




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 Re: 720 into 70 in reply to buickanddeere, 11-02-2006 08:17:24  
Hello,

Anyone know the name / address of the machine shop that specilizes in JD G + 70 rebuilds?

Thanks



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Mike Aylward

11-02-2006 06:01:30




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 Re: 720 into 70 in reply to bassndeere, 11-01-2006 18:00:45  
The bore would not be a problem but I am not sure of the compression height. Also, the 720 has a much larger wrist pin than the 70 (almost half an inch bigger). Mike



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Mike M

11-02-2006 04:36:15




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 Re: 720 into 70 in reply to bassndeere, 11-01-2006 18:00:45  
I'm betting you will find they are different heights from piston pin to top of the piston. The 720/730 had the plugs in the head where the 70 has them in the block.



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green49jda

11-01-2006 18:50:04




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 Re: 720 into 70 in reply to bassndeere, 11-01-2006 18:00:45  
I don't know, but I know if they did fit, your block would have to be bored to 0.125 to match the pistons!



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Glen in TX

11-01-2006 22:27:14




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 Re: 720 into 70 in reply to green49jda, 11-01-2006 18:50:04  
The 720 & 730 standard bore was 6.00 inches. 70 standard bore is 5.875" so .125" overbore would be 6" so why would he need to bore it more? Not sure about the pins but those and rod bushings can be changed to make it work. Are pistons about the same length?



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