B6100HST-D Engine

[LedHed66]

I have a B6100HST-D that we bought off an estate auction. The tractor was loosing water and I put a new radiator in it and it seemed to be running well. Apparently it was still loosing coolant and overheated. After getting it in the shop and taking the head off I had water in all 3 cylinders. I really like the little guy and would like to bring him back to life, but I'm confused about what engine it has in it. Just trying to figure out if the motor has been changed at some point and that it isn't original. According to the tag it should have a 675CC engine, but the block looks like 575CC?

 

[North Idaho Wolfman]

Stamped on the engine right next to the injection pump on the flat facing up is the engine model # and serial number.
Read that.

 

[LedHed66]

Stamped on the engine right next to the injection pump on the flat facing up is the engine model # and serial number.
Read that.

Thank you, found the stamping and it is indeed a 650, sadly it appears the block may have a few minor cracks. These blocks are difficult to find.

 

[North Idaho Wolfman]

Thank you, found the stamping and it is indeed a 650, sadly it appears the block may have a few minor cracks. These blocks are difficult to find.

Any of these blocks having a crack is extremely rare.
And those blocks having a crack, would put water / coolant in the oil pan, not the cylinders.
Take a few really good pic's of the bottom of the head, I'll bet you you have cracks in the head.