Just purchased a 95 F-350 with a 7.3 liter motor. Got it for a steal, original owner said that the oil cooler was just rebuilt and ever since the oil and coolant are now mixing and the coolant is pressurized. I have not really got into the diagnoses yet. but does anyone have any quick thoughts. I right off the bat have a feeling that something was installed wrong or damaged during the work. If anyone has any good thoughts were to start please let me know, as of right now I have limited time to look into it until the weather gets warmer. Any help on this would be great.

Thank-You
Heaveyhauler05525

 

Is the oil in the coolant or coolant in the oil ?

 

it has oil mixing with the coolant.

 

I'd start with rebuilding the oil cooler again

 

Make sure it is oil and not fuel. A cracked injector cup will put fuel in the coolant and pressurize the cooling system.

 

great thanks for the quick info guys, this is the greatest site. I had a feeling that it may be related to the oil cooler as the problem was found by the other owner right after the work was done, 2 good places to start, and I have coolant test strips. The truck is not going to be put on the road right away as I am going to paint it, so while its down I think I'll do both the oil cooler and all injector cups, as I have the tool anyways