I just got a Case 930 comfort King diesel,Im pretty sure its a 6 cylinder detroit diesel.,that hadnt been started for a few years.We changed out all the fuel filters and put on some gtood batteries and it started up pretty easily.We ran it for a few minutes,I opened the radiator cap and it gushed out water with oil in it.I put the cap back on and grey slime started coming out the overflow.The motor wasnt ran long enough to pressure up the radiator.Im not sure there is even a thermostat in it so im not sure if its compression or just waterflow making the water flow out the cap.

At first I thought headgasket but it looks like way too much oil in the water too quickly for headgasket.Could it be an oil cooler and could the oil pressure ,pressure up the radiator like that.I dont knwo much at all about tractor engines so I could use any advice you guys have.

 

It could very well be head gasket where the oil pressure is leaking into the water jacket. It also could be whatever it has for an oil cooler. I am not at all familiar with the engine but this is just generalities. The oil pressure, especially cold would be higher than the coolant pressure and the oil would run right in if it has a leak to it. Generally a cracked block would just fill the crankcase with water.

My guess would be head gasket first as the leak in a cooler would not be enough to pressurise the cooling system but compression would.

 

I just went out there and looked and I dont see any oil cooler on the radiator or anywhere around it.It looks to me like the oil is getting in the water jacket somewhere inside the block.I cant see anything on the outside where oil from the crankcase is at all.There is no water in the oil at all,but it looks like its down to the add from full after about 5 minutes of running.I did figure out why its popping open the radiator cap and pouring out the overflow,the rubber is gone off the cap.Is there pressurized oil running through the headgasket enough to pump that much into the water if the headgasket is bad?

 

Since you just got it, makes me wonder if the previous owner may have mixed oil in with it on purpose thinking it would keep things from rusting. I have had farmers in the past tell me to do this with my tractors because they sit so long in between use.

 

Oh so some farmers put oil in the radiator for storage.I guess I need to flush that radiator to make sure thats not the case.The guy that owned them is no longer around so I cant ask him.

 

Some of these old farmers had way to much thinkin time on there hands. Boredom does strange things.

 

Okay, I don't have that particular model of tractor but I have worked on the series newer. ie. 870, 970, 1070 etc. I think they called them Agri Kings or something.

I'd bet there is no oil cooler on that tractor, there isn't on an 870 anyway.

Head gasket??? Maybe.... Cracked block is my unfortunate guess. Too bad you couldn't test some uncontaminated coolant from it to see what the freeze proterction was.

 

I usally drop the pan and preasurerize the radiator and get under it with a light in most cases like this. That will usally give me and answer as to what is going on. It could be a few differnt things and I find this method usally tells me what it is and if I don't see the problem the next step would be to pull head.

 

Well the antifreeze that came out at first was green so at least I know it wasnt straight water,but yes its too slimed up to test it now.Man I hope its not a cracked block.I dont think there is any oil cooler on it at all.
I guess the next thing is get a good radiator cap and rinse out the radiator and see what happens,I will do the pull the pan and pressure up the radiator also before I pull the head,thanx for the replies keep them coming if anyone thinks of anything else.

 

Once you find your leak, you then face the problem of getting rid of the oil in the cooling system. Hint - flush with hot water and Cascade dishwashing detergent.

Rusty

 

I'm a non hear so don't stomp on me for my stupidity. The hot water would flush the oil but wouldn't the detergent leave the metal dried out and more prone to rust. All metal needs some amount of oil to not rust. Again, just a question, not saying anybody is wrong here, my questions always seem to offend somebody.

 

1. Flush with the hot water and Cascade dishwasher detergent.

2. Passivate by flushing with plenty of clean water.

3. Fill system with coolant/distilled water mix for corrosion protection.

The hot water/Cascade flush is very similar to "hot tanking" a cylinder head or block.


Rusty

 

Thanx I will do on the cascade

 

No Detroit. It's a Case engine. 80hp, 401 CID.

Some were called "Comfort-King". Agri-King was later.

 

The 930 is a case motor,They are really bad about cracking heads, it has 3. I had 1 that went through 5 heads before i got rid of it, I'm beating thats your problem, they CAN NOT be gotten hot at all,Terry