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Old 11-12-2009, 03:59 PM
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places where coolant could leak into engine?

I have been watching the coolant leave since i purchased my truck new. Originally i thought i was loosing a little coolant onto the ground but it was so slow it was hard to locate. After watching this for sometime now i have notice that at every 5k oil change i need to add 16-24oz of water/coolant. Since i couldn't find a leak i have done two oil analysis and they have come back with higher than normal Potassium levels. OK so its going into the engine but how? Can someone list all the places i need to look? I've already had my dealer pressure test the system but since its such a slow leak nothing showed up for them.

thanks,
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Old 11-12-2009, 06:32 PM
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I have been watching for an answer.... Because I am not all that savvey with this 6.4...

I am wondering about the EGR cooler. If it had a hairline crack you could be leaking coolant into the Exhaust Gas Recirculation system and it would just be blowing out the exhaust in a tiny bit of vapour you could not detect. I just do not know if this would show up in the oil, but possibly over that long term...

The obvious would be a leaking head gasket. If this is true it should get worse in time so they can find it... A tiny leak in the head gasket between oil and water ports even, maybe only when it was cold, that sealed better when the heads got warm...? Maybe they should pressure test it cold, stone cold...

The only other place I can think of off hand, is if this 6.4 has an oil cooler. A lot of larger diesels have an oil cooler, not even sure if this one cas one, but.... If so,this is possibly the cause with a tiny pin hole leak in the gasket where it hooks up or in the cooler itself. But not to sound too stoopid, I really don't even know if the 6.4 has an oil cooler, not having worked on one yet...

Only guessing, a few places to look a bit further.... Hope I have been a help.
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Old 11-13-2009, 02:49 AM
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Another problem I've heard of is cavitation in the water pump causes coolant to leak into the engine behind the water pump. I haven't seen this problem myself. Anywhere coolant and oil come close could cross contaminate - head gaskets, water pump, block, heads. The smaller the leak, the harder to find. Check for residue around the cap on your degas bottle, that's a sign of Head gaskets or EGR cooler.
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Old 11-13-2009, 02:07 PM
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Thanks guys for the help. I'll dig into these areas to see what i come up with. I sure would like to fix this as i know it can't be good on the engine.
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Old 11-13-2009, 09:13 PM
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Coolant Flow

tried to attach coolant flow diagram if you give me an e-mail i can send it to you.
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