Maxxforce 7 engine - coolant in oil

First, we have problem with this International truck 2 months ago. It was broken down, engine didn't start. One mechanic told its low pressure pump. He replaced it, but truck was still dead. Then another mechanic was looking 2 days for air leaks or any other leaks. Then he told it's bad high pressure pump. After replacing, truck runs good, but not so long.

Weak ago engine starts shutting down 3-5 minutes after start. It was like we didn't have enough fuel delivery pressure and injection control pressure. The guy who installed new high pressure pump said it could be bad icp sensor or ipr.

Also we cleaned dpf filter because we had regen every 700-900 miles. We had oil in intercooler going from turbo. We replaced turbo. Also we had oil from crankcase breather filter, so it was replaced also. $650 for that filter, I hate you, International.

After we did all this, installed new turbo and start engine, it was smoking somewhere ahead turbo, air or exhaust leaking. Next day we continued testing this truck. We started engine, no air leaking. I noticed fault code - high diesel oxygen catalyst temperature or something like this - temperature was near 550-650F. Then this fault disappeared. After few minutes of working engine starts working roughly, sounds like additional knocking at n engine. Then I saw smoke from engine (near turbo) and turned off engine. After this I turn down n engine again, after 30 seconds I saw warn dashboard light "low coolant level". I turned engine off. It was low coolant level. I looked under truck and see dropped oil or coolant near oil filter. But it was not so much and I had almost empty coolant tank. And I saw coolant level drops. I checked oil level, it was very high. When we added water, 2 gallons, it dropped in 20 seconds and we had completely empty coolant tank. So it goes to crankcase very fast.

Any thoughts about all this will be very appreciated. I'm sick with this piece of International truck. We have couple another trucks, but International is the worst for now.

I guess it can be burning coolant smoke from engine/turbo side. When we checked turbo, it was oil in turbo again and looks like this oil goes from crankcase breather. First thought was bad head gasket. But truck was not overheated. It could not be overheated, it was on yard, we just tested it after replaced turbo. I never saw 2 gallons goes away in 20 seconds. It looks like big leak goes straight to crankcase. Where its leaking?
Any thoughts about all this will be very appreciated.

 

You think it can be bad water pump?