670T engine question

1982 was M-100 and Bosch nozzles and big pins in the 8000 series and N-series combines for sure. I think the big pin/3-ring piston thing was the fall of 1980 production??  Still a Roosa pump but Bosch injectors.  It would have been at a certain eng s/n break. That's kind of how I remember it.

Are the pump drive gear and the idler gear still in it? They are different from the M100 to the Rossa. As for blowby,  I should have mentioned in the 7010 post,  when these engines get coolant in the oil, they  will develop what appears to be an extreme amount of blowby. The coolant will pool a little bit on the top of the head,under the rockers arms. As the temperature rises in the engine,  this coolant tends to evaporate and causes a steam. When the steam comes out of the breather tube, you would swear that the rings are totally shot on the pistons. The engine may run just fine, but it sure doesn't look like it should. 

I would somewhat expect excessive blowby to include harder starting and increased oil consumption to be included.  In the end, it doesn't really matter if the engine needs overhauled because of poor ring seal or water in the oil. It will still have to be torn all apart. 

Ed its not a collector tractor. I use all my equipment. You more than likely you have never seen this kind of blowby. Ive got a 60 by150 shop. If i start it inside in 5 minutes you cant see from one end to the other. Compression is down as it has to spin to start. The main reason i want to change the motor is i want to save that counter balanced crank. Ill put a temporary motir in it so i can build the original back like it should be