BXS oil in coolant

I dont think that number of miles would have done it. It took three 400 mile turns with straight water and detergent to get all the diesel fuel out of my cooling system after my injector tubes went bad. Scared me to death but the shop just laughed at me when I said I was worried about liner pitting in that few miles.

 

When I had oil coming out the coolant rez over flow hose it turned out to be a bad oil cooler.....I'm no trained wrench just passing along what the big boss man said the problem was..

good luck..

 

Well the precooler has no oil involved in it...just pressurized intake air and coolant. Also running the truck that far won't cause enough pitting to even worry about. Now if the motor overheated than I would be worried. CAT engines can crack heads very quickly (even with water temps as low as 180* since all it takes is a air pocket). Make sure the oil cooler was tested correctly, then move onto testing the other thing. I would also pull a oil sample and look for high copper levels which would point towards the oil cooler.

 

Does that truck have a water cooled transmission? Could be the transmission cooler going bad. I had that happen to me and I replaced it with an air cooler.

 

Don: I have had oil coolers test bad by soaking in boiling water and lightly tapping the cooler on the plate end, therby simulating road vibration. If the engine has never been down themn I would suspect liner being cavitated about half way up the liner where the compression can push the oil into the cooling system. If you do have a transmission cooler you can pull it off and pressure test it also. If you aren't running it hard for a trip or two bypass the trans cooler and see if anything. I have had one bad in all of the CATS I worked on.

 

did this truck ever get fixed i have a bxs cat doing the same thing and its not the oil cooler had 3 on it i just dont understand how a liner can put oil in water

 

Had the same thing going on on my c13. When I checked with CAT they told me rule of thumb is 20000 hrs. If you're over and have those symptoms it's quite likely that your liners show some cavitation and leak oil into coolant. I got my inframe done at about 27000 hrs.
Not only miles cause wear, idling is the next big factor in this game.
Make sure it's oil. It could also be fuel. But fuel I'd guess would smell out of the reservoir. The mechanic at CAT only put his nose in the reservoir and confirmed it was oil in my case.
The next problem you're going to have is coolant hoses. You mentioned it already and it won't be the last one. Oil penetrates the silicone and damages the hoses permanently. Your hoses quite likely look wet and greasy now. That's oil coming out of the hoses. Hoses which are exposed to extreme heat are the ones which blow up first.
I think it's time for an inframe and don't forget to replace ALL coolant lines after oil is removed from cooling system.
If you do it yourself use dishwasher soap to flush the system. It doesn't foam.
Good luck.

 

thanks