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John Deere Tractors Discussion Forum
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Re: John Deere 70D Pony Motor bearings

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Mike M

02-19-2013 13:21:51

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From what I remember those V4 ponies all had the same rods. The mains were changed at some time and the size changed. 2 different cranks also because of the main brg. size change.

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02-19-2013 18:19:44

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 Re: John Deere 70D Pony Motor bearings in reply to Mike M, 02-19-2013 13:21:51  
When the black dash 720 diesels were introduced the pony engines were also changed and had s/n plates on them. The difference between early pony engines and later ones are : bigger pushrods/lifters/rockerarms, thermostats and water pump bypass tubes , larger main bearings and thrust washers and different linkages in the transmission plus a few other minor changes.

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02-19-2013 19:46:38

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 Re: John Deere 70D Pony Motor bearings in reply to Blksmok, 02-19-2013 18:19:44  
That would explain the 4 pushrods that resemble bananas. I think I'll keep the throttle speed down around 4000 rpm. Think it will produce enough juice? I live in CA where below 20 degrees is very rare....

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Mike M

02-20-2013 06:17:19

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 Re: John Deere 70D Pony Motor bearings in reply to jmg, 02-19-2013 19:46:38  
Neighbor had one that had some of those "bananna" pushrods along with broken rocker arm shaft. Had to of killed off a couple of cylinders. Funny thing was it would still start the diesel engine up !!! Just stuck some used good parts back in it and kept going.

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