Ford 6610 oil cooler

mikewood869

Well-known Member
If the oil cooler was leaking, could the pressure from the oil cooler make enough pressure to make the radiator hoses hard? I ended up taking the radiator to a shop to get cleaned and tested. They weren't able to test the oil cooler because the radiator was leaking somewhere else. I guess the guy was able to pressurize to 7 or 8 psi before it was leaking.
 
Regardless of whether or not the oil cooler is leaking, the radiator cap is what limits the pressure in the cooling system. So
I'm going to say no to your question.

If the cooler was in fact leaking, you'd have a black skim of oil in the top of your radiator upper tank.
 
The hoses will be hard just from the pressure of the coolant and pressure cap. If the radiator was leaking at 8PSI, it was bad, should handle about 15 PSI, as I would imagine cap is 10-13 PSI.
 
And this...
mvphoto66186.jpg
 
I can't reach out and put my finger on that, but if it's slimy/oily, then definitely pressure test the oil cooler. Your
radiator shop isn't trying very hard if they say they can't. They need to pressurize the cooler to test it for leaks, not the
radiator.
 
That photo came from the pre-flush. After the 5 flushes I did to the tractor, the vinegar coming out mostly looks like that (comes out as red hard boiled eggs color). Each flush runtime had 6 hours. When rinsing out the motor with water, the water turned clear is 3 minutes. Also vinegar seems to make things rust. When the guy called me after he clean the radiator (as good as he could get it) and tested, he found the radiator was leaking in multiple spots. He said he couldnt test the radiator enough to be sure the oil cooler wasnt leaking. From what he said the oil cooler had crap in it and the radiator cores werent far off. He told me the price of him to re-core the radiator, would be cheaper for me to buy a new one and he wouldnt be sure if the oil cooler would leak. Usually on all the other tractor and vehicles we had, the radiator hoses wouldn't get that solid, normally you could squish them a little at temp. I don't remember the 6610 being like this last year. The coolant holds 3.6 gallons and with the thermostat in, it was blowing out 1 1/2 gallons with in the first 20 minutes at 1,300 rpm. If I'm driving down the road at pto rpm, its 8 minutes. The tractor doesn't overheat. I have a 13 psi radiator cap on the radiator. The water pump gasket also blew last weekend. Im going to pickup the radiator and at least order a gasket for the water pump.
 
I forgot to say, I was loosing coolant before, but the coolant wasn't being blown out of the radiator. After 12 hours of running I had to add a 1/4 jug.
 
I ended up picking up the radiator. The guy said the radiator was plugged up bad and he wasnt able to clean out the oil enough. The radiator is leaking on the right side in the corner somewhere and the bottom left corner and in the bottom middle. The radiator definitely cleaned up better.

Getting the radiator back.
mvphoto66231.jpg


When the radiator finally came off.

mvphoto66232.jpg
 
Need to find a new radiator guy.

Plug one oil cooler port with an inverted flare fitting. Pressurize the other one to about 50-70 PSI and submerge the whole thing in a tank of water. Let it sit for an hour or so and come back. Continuous bubbles = oil cooler leak.
 

Well you need a radiator so put a new one on and see what happens.
Haven't had it happen on a Ford tractor but I have had oil coolers leak on some of my trucks, normally when 40-60 psi of oil pressure goes into the radiator you'll know it from the oily brown mess puking out the overflow and the engine will also be low on oil.
You haven't said anything about it loosing oil.
To me pressure in the cooling system and some oil in the radiator is a indication of a leaking head gasket, NOT blown but leaking, had that issue with a 5.9 Cummins a while back.
A pin hole in a cylinder can put pressure in the radiator but usually dumps coolant into the oil pan.
 
(quoted from post at 04:25:47 12/07/20) Need to find a new radiator guy.

Plug one oil cooler port with an inverted flare fitting. Pressurize the other one to about 50-70 PSI and submerge the whole thing in a tank of water. Let it sit for an hour or so and come back. Continuous bubbles = oil cooler leak.
Thanks that was the plan, to test it myself. I wasnt sure what the oil cooler was pressure. The guy said he pressurized the radiators to 13 to 15 psi. The tractor does use a quart of oil over 40 hours. The tractor got a head gasket 2 or 3 years ago. I was thinking the tractor was getting compression from the block or head, but I will find out when the radiator comes in.
 


fill radiator to very top... let tractor idle... keep adding water a bit to keep at top of neck and look for bubbles... if leaking head gasket... it will keep on letting bubbles out,, but you can only see them if you keep the water level up to the neck... and if you have some one increase rpms, you will MORE bubbles come out...

if no bubble after watching, then its somewhere else... pinhole, oil cooler or other problem....

a head gasket can blow between an oil port and a coolant port but as compression is always higher, it will blow bubbles into the radiator, oil pressure is also higher so it will migrate to the water side.
 
I ended up getting the tractor running tonight and its mostly together. It turned out the water pump gave out and I found out yesterday afternoon, but I was able to get a replacement water pump just before the place closed. A heads up for anyone who buys a replacement radiator with oil cooler from yesterday tractor,
The radiator is about a 1 1/2 inches smaller on width and height. I didnt think about thickness. Im going to test out the tractor tomorrow.
mvphoto67189.jpg
 
Well, I didn't even run the tractor for 20 minutes and I managed to almost fill the jug. The tractor didn't get to temperature. I took a nice 30 ride on the road today. I got back and I thought saw moisture dripping from the tractor not running, it was the smell of vinegar. So now it seems to be mixing and the oil smelled fine. Well from what it seems, the head is coming off. Also after I plugged the block heater in last night and checked on it today, the radiator was pressurized and I could hear air escaping from the radiator cap. After I shut off the tractor, the air was still rushing for ten seconds.
https://www.youtube.com/watch?v=nghpPtx-Huw

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