Oil in Coolant - 1994 5.0
Not really a Fox....but close!
I posted this at Corral.net and got nothing, so I figured some engine Gurus around here might have some insight.
I bought a 1994 GT with a T5 that has oil getting in the coolant. I knew this up front, basically stole the car for he wanted. The car was a good friend's, he had it diagnosed as a cracked block from a shop I do not know about. I got it from Texas to Wisconsin with me and before I started ripping into it, I decided to verify the block claims.
Here is what has transpired:
-- There is DEFINITELY oil in the coolant, but not enough to turn it into sludge, just make a thick oil slick on top
-- There is NO (repeat:NO) coolant in the oil. I drained it the other night with no signs of water in the crankcase at all. The oil change is not "fresh"
-- I put a pressure tester on the radiator, cranked it to 19 psi, and let her sit. No drips in the 30 or so minutes I was watching the oil pan, also no external leaks. I left the tester on the car and called it night. The next morning I pumped it back up once to 19 after it lost about 2psi over 12ish hrs. I have now had the pressure tester on for 36 hours now with no real pressure loss (maybe another 2 psi). The plan is to pull the drain plug again and see if water made its way into the crank case.
So It's an interesting conundrum that oil is only passing one way. There's not a whole lot of areas where those two fluids interact that would cause this.
I'm starting to wonder if a jiffy-lube tech put oil in the coolant overflow and sent the car down the road...
Any thoughts would be appreciated! I will probably do a compression test and inspect the plugs next. I fall seems good there, I will probably flush the coolant system really well with some dawn and see if the problem comes back.
eventually a 1969 Mustang Fastback--been in hibernation since 2011 due to school...
Now the time has come to resurrect her once and for all!
Currently on a body cart with a finished undercarriage.
Last edited by GypsyR; 10-03-2018 at 10:44 AM.