Fuel in oil

Can someone tell me how and what to do. I have case 400 diesel 1956. I went and stared it the outher day and found that diesel fuel was going in the oil..so much it blew out the dip stick.can anyone help. Thanks John

You probably have a bad Oring in the pump assembly somewhere. It is normal to have some fuel get into the oil. During a cold start some fuel is always pushed past the piston rings.That is called fuel dillution and that is why we change out the oil. Sounds like you ahve a major problem.

Sounds like you have a leaky seal on the injection pump allowing fuel to flow into the crankcase.
I wouldn't run it any more. When the crankcase gets overfull the engine can over-rev. It can't be shut down when this happens. It'll keep running until it burns up the excess fuel-oil mixture if the engine stays together that long.

a run a way Case can be shut down by opening the de-compressor, something Dad taught me when I started driving the 830

Start with replacing the gear pump seal, Ambac # PK7910. May be CR4230 also if memory is correct. If fuel still gets in oil best to replace all head seals. Pump can be completely resealed, but most hard parts are no longer available. Just mailed back a Case PSB pump that had the same leak.

That's why it is a good habit to get into to check the oil BEFORE every start up.
If you had not of seen the dipstick blow out and get it stopped hard telling how much engine damage could of been caused if it was put to work ?

Does your tractor have a mechanical fuel booster pump. If it does you could check for a leaking diaphragm. Not sure if it does or not, but much cheaper and easier to deal with than an injection pump.

I had the same problem (for a long time) with my David Brown 990. My leak turned out to be through the thermostart (if that is the right term) on the intake manifold. There was a little tube that went from the fuel tank to the thermostart, and the leak in there just got worse over time. I blocked that off and so far my oil level is staying where it should be.

Before I blocked that off I was told to take my lift pump off and put a container under it for awhile to see if it leaked, still hooked up to the fuel system. (I actually bought a new lift pump before this, that was not the problem) I never saw a drop there. Another suggestion that was given to me was to drop out the oil and take off the oil pan to see if I could tell where the fuel was coming in. I never did that but wish I would have done that first, because I would have known it was not the injection pump. I sent that in at one point and spent $50 to have the front seals replaced because someone told me that had to be the problem if the lift pump was OK

I also had this problem on my Oliver 1755. That turned out to be a leak along the outside of the shaft tube in the injection pump; I could see it leaking down from under the injection gear and the pump guy had just replaced the seals. I sent it back and he found the leak on the outside of the shaft tube.

Hopes this helps, and sorry for the long post.