John deere 655 engine swap???

   / John deere 655 engine swap??? #11  
My JD manual says the 755 uses a Yanmar 3TNA72UJ and the 855 a 3TN75 RJ engine. Maybe you can find dimension specs based on that?
 
   / John deere 655 engine swap??? #12  
I know this thread is a bit old (over 5 years) but in case someone comes looking for information I just swapped the 3TN66UJ out in my 655 for a 3TNE68. It was as straight forward as it could possibly be. I had to swap the water pump and alternator from the 3TN66 but other than that everything bolted right up. Went from the 16hp 3TN66 to a 20hp 3TNE68. Gain of 4hp and now it starts on the first attempt.
 
   / John deere 655 engine swap??? #13  
My JD manual says the 755 uses a Yanmar 3TNA72UJ and the 855 a 3TN75 RJ engine. Maybe you can find dimension specs based on that?

I know the 750 is a 3cyl (I had two of them), and I am pretty sure the 650 is a 2cyl. I am "guessing" that the 655 and 755 are similar in that respect?? If so, that alone would probably make for some significant differences. Still, they may bolt up the same??
 
   / John deere 655 engine swap??? #14  
Research the engine itself. Many of the 3TN series share the same block with same stroke... different bores size for different displacements. If you find a 3TN with the same stroke as your original engine, but with a bigger bore... it will more than likely be a straight bolt in. That was the case with my 955. The original engine was a 3TN84, but I have a 3TNE88 installed in place of the original. The 84 and the 88 have the same stroke.
 
   / John deere 655 engine swap???
  • Thread Starter
#15  
Research the engine itself. Many of the 3TN series share the same block with same stroke... different bores size for different displacements. If you find a 3TN with the same stroke as your original engine, but with a bigger bore... it will more than likely be a straight bolt in. That was the case with my 955. The original engine was a 3TN84, but I have a 3TNE88 installed in place of the original. The 84 and the 88 have the same stroke.

Thanks for posting. I sold my 655, but would like to find another one someday. I will keep this engine swap in mind for sure. Thanks again
 

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