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Old 09-22-2012, 09:01 PM
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Oil in coolant

Was looking in my coolant bottle today in my colleges AutoLab and noticed a black residue around the top. The shop teacher and I determined it was motor oil, One of the former students who now works on Big Rig diesels said I might have a leak in one of my head gaskets I talked to my friend who works on them and he said something about the oil cooling system above the filter and most of the time that is the cause of the oil in the coolant. I was woundering how much time will it take to fix the oil cooler? Im hoping it isnt the heads
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Old 09-22-2012, 10:30 PM
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Injectors cups or oil cooler. Either one is pretty easy to fix... hopefully someone will chime in of how to determine which one of these it is, haven't dealt with either so I'm not familiar on diag on these.
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Old 09-23-2012, 11:00 AM
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Originally Posted by dentexpowerstroke View Post
Injectors cups or oil cooler. Either one is pretty easy to fix... hopefully someone will chime in of how to determine which one of these it is, haven't dealt with either so I'm not familiar on diag on these.

The guy that worked on the big diesels said they use a vacume device on the coolant bottle with a ball in it to see if the combustion pressure is coming up. Basicly if nothing the ball stays still if there a leak it bounces
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Old 09-23-2012, 07:06 PM
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I haven't heard many head issues on a 7.3. Has your truck puked at all?
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Old 09-24-2012, 05:58 AM
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Originally Posted by dentexpowerstroke View Post
Injectors cups or oil cooler..
Yep sounds about right
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Old 09-24-2012, 06:17 AM
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I haven't heard many head issues on a 7.3. Has your truck puked at all?
define puked. I havnt noticed any coolant coming out or the black residue running down the bottle. have had some water drip out by the passanger side front wheel but thats it
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Old 09-24-2012, 11:02 PM
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its your oil cooler my truck did the same thing. either the seals in your oil cooler are bad or the inside of your oil cooler is rusted out causing you oil and coolent to mix. it cost me about $ 700 to get mine fixed but the shop put in a brand new oil cooler.
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