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John Deere Tractors Discussion Forum
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60 LP pistons/rings

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Tim Grissom

06-10-2012 20:43:35




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I am rebuilding a JD 60LP. I have the head done. The block looks like it should be bored out. In the parts manual, I show LP pistons in two different sizes. Standard and .045 over. Are LP pistons different than gasoline pistons? They take the same ring set. I am scared to bore the block without having a resource for new pistons. Should I just reuse the old pistons with new rings? Thank you for your input!

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TylerARK

06-11-2012 14:18:02




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 Re: 60 LP pistons/rings in reply to Tim Grissom, 06-10-2012 20:43:35  
LP pistons are about one inch taller than gas pistons. lots more compression,



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F-I-T

06-11-2012 06:47:33




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 Re: 60 LP pistons/rings in reply to Tim Grissom, 06-10-2012 20:43:35  
>>>Are LP pistons different than gasoline pistons?

Yes. Parts book shows that as well.

From the FSB:

LP-Gas has a lower heating
value per gallon than gasoline, so
it won"t do as much work per
gallon as gasoline. But LP-Gas
has a high octane rating, which
permits raising the compression
ratio to compensate for the lower
heating value of the fuel. In John
Deere LP-Gas engines the compression
ratio is 7.3 to 1.

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teddy52food

06-11-2012 06:05:04




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 Re: 60 LP pistons/rings in reply to Tim Grissom, 06-10-2012 20:43:35  
Better get it measured up & see what it needs. Maybe it has been bored before.



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Tim Grissom

06-11-2012 19:35:57




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 Re: 60 LP pistons/rings in reply to teddy52food, 06-11-2012 06:05:04  
Will do. Thanks!



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buickanddeere

06-11-2012 05:53:19




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 Re: 60 LP pistons/rings in reply to Tim Grissom, 06-10-2012 20:43:35  
Have you actually measured the bores and pistons or just eyeballing the parts?



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Tim Grissom

06-11-2012 19:32:30




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 Re: 60 LP pistons/rings in reply to buickanddeere, 06-11-2012 05:53:19  
As you suppected, I have just "eyeballed" it thus far. I took a hone to it. The ridge at the top of the cylinder is what I am basing my statements on. I will get it measured in the next few days. Thanks!



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