I don't understand this
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    green and red man's Avatar
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    I don't understand this

    Ok, so y'all are aware of the GEP pistons that came out of the 70 that was converted to LP long before I bought it. They measure 4 3/4" from the top edge of the piston to the center of the wrist pin. I still have not cleared up what a salesman told me in regards to GEP piston measurements.

    I located some genuine original John Deere LP pistons. The owner measured them and got 3 1/4". ???? They are too far away for me to measure them myself, so all I can do is assume this is correct, or not.

    I'm confused on them being shorter. They look almost identical to the pistons from the 70. I know that the gas and LP 70 used the same head but a different block. My tractor had the original gas block in it, but used aftermarket LP pistons. Now if I could just find out what the exact difference is with the LP block. Supposed to have the same bore and stroke, from what I've read. I already know about the different exhaust manifold. The same connecting rods are used in both engines, as are the same push rods. Used the same valves, but the LP used different valve seats.

    Have had two different people try to sell me entire 70LP tractors for parts, but it would be waisted money. One is a rust bucket that was rolled over at one time. The other is too nice to use for parts.

    Decisions......decisions. (scratches head)



    Last edited by green and red man; 06-21-2013 at 07:44 PM.

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    green and red man's Avatar
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    After viewing the parts diagram, at times I want to believe the same crankshaft was used in both engines and other times it makes me think they were different. Wish Deere would've made it more clear.

    For some reason the diagram in PDF form isn't uploading on here.



    Last edited by green and red man; 06-22-2013 at 11:22 AM.

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    green and red man's Avatar
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    Went ahead and bought the LP pistons. Got them cheap enough so if they won't work for my application, I can just turn around and resell them or use as big paper weights.

    At least this is far cheaper than having to buy an entire tractor just to see the pistons up close.




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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Now I understand--don't rely on someone else's measurements

    Just got the JD original LP pistons in and measured them myself. They do not measure 3 1/4" from the top edge to the center of wrist pin as told by seller. He measured from the bottom. They are exactly the same as the GEP LP's, 4 3/4".

    Don't have time to take pics and post them right now.

    At least now I know where the confusion came from.



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