whydifferent diameter of pushrods 113ci and 135ci ?

marlin54 · Sep 5, 2020

so I am rebuilding my 340 backhoe motor which is a 135 ci with a 3.25" bore and has stepped head pistons and the previous owner who allready had taken the head off years ago gave me the parts he took off in a basket like rocker shaft , pushrods ect. so I was missing several pushrods and other parts and went to my friend who has many farmalls / International for parts and I got 2 push rods and 2 head bolts and these parts came out of a 113 ci motor. and we measured them up and they were the same length so I went home to put it back together only to find out that the pushrods we took out of the 113 motor was bigger in diameter than the 135? so I am using them as its all I have , and so I called him and he said that both motors calls for same part # for the push rods ? Ok so anyone have any thoughts on this as I would think that the bigger 135 motor would have bigger pushrods? any reason I cant mix them up? thanks in advance

Janicholson · Sep 6, 2020

If the ends are identical so they cup perfectly, and the length is within .010 of the same, I see no reason they would not work. I would want to use all of one type just for my own sense of uniformity. As to why, the engineers that choose designs probably found a way to reduce costs a few cents without compromising strength. Jim

used red MN · Sep 6, 2020

I agree with Jim, if the ball and cup are the same and nearly the same length, no problem. Now if you were spinning this thing up to 5000 rpm then the differences might need some consideration. At stock governed speed no issues.

whydifferent diameter of pushrods 113ci and 135ci ?

marlin54

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Janicholson

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used red MN

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