C12 cat. Engine coolant leaking into engine

Are you sure that the coolant is going into the crankcase oil?
Oil cooler failure usually sends engine oil into the cooling system.
The water pump is highly possible and a common cause of coolant in crankcase oil.
You would need to pull the oil pan and pressurize cooling system, watch for coolant trails at water pump.
Is the oil level raising on the dipstick with engine use?
If the engine oil has coolant entering the coolant will go to the bottom of pan sump after sitting over night. Crack oil drain plug open in morning and drain into pan. Are you getting any coolant before the oil comes out?

 

I also have a c-12 and i have added 4 gallons of anti freeze in the last week. I cant find anything on the ground, where is it going? Please reply if you know anything. Thank you.

 

Cooter1... I am having the same issue with my C12 as well. I don't see anything leaking on the ground or anywhere on the engine. Based on what I have been reading on hear I may be leaning towards the watpump as well. What did you find out on your engine?

 

I did the pressure test cant find a leak. I just purchased a water pump today i hope this will correct the problem.

 

It would be best to loosen up the oil pan drain plug and see if coolant comes out. If no coolant comes out and your oil isn't milky it most likely isn't the water pump.

 

O.k. I will try that. Thanks for the info.

 

Hey Bender, Our C-15 is getting blowby into the crankcase, but runs good, cooling is leaking into the oil pan. you can notice the oil is milky....we added 2 cans of iron type stop leak, brought it to running temp first but it did not work. Any ideas what should we look at to fix the problem? help appriciated. Happy holidays everyone.

 

Drop the oil pan, pressurize the cooling system, look for coolant trail that is entering the oil pan (running down liner, water pump area etc). You might need to rotate engine to clearly see the source of the leak.