B7500 motor swap

   / B7500 motor swap #1  

Tomtint

Elite Member
Joined
Apr 12, 2011
Messages
3,116
Location
Boston
Tractor
L3700SU
My sister has a B7500 that somehow someway either blew a head gasket or cracked the block as there is now water in the oil. Unfortunately it was run hot and lunched the motor, her tractor has 200 hrs +/- on it.. but has been neglected and left outside over the years. ..dealer estimated 9K to fix it. .. not worth it. We found a 80hour B7500 that had been stripped of numerous parts.. but the block was still intact. Oil looked new, engine turned by hand easily and the antifreeze was still like new..so we bought it and now have started the swap over...man..is there a lot of bolts for such a small motor... the only thing I'm really concerned with is putting the injection pump apparatus back on and timing it etc.. I may just get the bu,k of the work done and bring it to the dealer to button up the loose ends and fire it up.. not sure yet.
 
   / B7500 motor swap #2  
Wish I was closer. Sounds like a fun project.
 
   / B7500 motor swap
  • Thread Starter
#3  
Got the "new" motor all unbolted and ready to pull. I'm going to be a little more attentive pulling the other motor so that I remember where everything came from and goes back the same way.
 

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   / B7500 motor swap #4  
Can you set both blocks to top dead center and then swamp the injection pump from the bad block to the replacement block?
 
   / B7500 motor swap
  • Thread Starter
#6  
Can you set both blocks to top dead center and then swamp the injection pump from the bad block to the replacement block?

I may try that.
 
   / B7500 motor swap
  • Thread Starter
#8  
So just to update this thread. I got the tractor 90% back together about a month ago. Everything but the injection pump, tank and a few misc other small pieces. Knowing full well that installing the pump and bleeding off any air in the lines was more than I was comfortable doing, I brought it to my local dealer to wrap up. It has sat there ever since. But they called today and it's alive. Purring like a kitt n. Should be picking it up next Tuesday or Wednesday. Haven't seen the bill from them yet but they have a couple days of labor in it and a few small incidental parts.
 
   / B7500 motor swap #9  
Good to hear. Are you going to have more into it than it's worth? Just curious.
 
   / B7500 motor swap
  • Thread Starter
#10  
Good to hear. Are you going to have more into it than it's worth? Just curious.

I think we are still ok. We paid 1500 for what was basically a while tractor minus a few parts. Then 2-300 in fuel and tolls. My time was free for the bulk of the work.. then 2 days of dealer dollars...? ... the original tractor had 270 hours.. the new old motor/tractor is a sub 100 hr machine. We have a tractor/loader/mower and pro bagger as well. I’m guessing repairs will total 4K +/-.... I can’t replace it for that.
 
 
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