Coolant Flush Without Flow Through Oil Cooler - Ford Powerstroke Diesel Forum
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Old 01-21-2011, 07:16 AM
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Coolant Flush Without Flow Through Oil Cooler

I had my EGR cooler fail and it was to the point I was concerned about starting the truck much less running it enough to flush the cooling system. I deleted the EGR cooler and installed a new oil cooler but didn't want to flush through it and clog it up so I bought a tapered rubber plug found at Lowes in the special fasteners trey section and fit it into the housing of the oil filter base where the coolant leaves the oil cooler and is directed to the EGR cooler or delete tubing now My oil ran around 30F hotter than my coolant temps and the weather was fairly cool so I would be hesitant about trying this in hot weather. The plug can be removed with out the disassembly of anything other that the housing cap that it's located under but as with anything on the 6.0L, space is very limited and it's a trick to get to.

I'm sure someone has probably already done this trick but I hadn't read about it, just studied the flow path from the 6.0 Bible and everything seemed to work as planned and no problems experienced so just throwing out this tip for anyone with the same situation and concerns.
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Old 01-21-2011, 03:19 PM
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Did you use this plug just for a coolant flush and then remove it?
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Old 01-22-2011, 02:46 AM
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10-4. I put it in when putting my oil cooler back in after tear down for head gaskets and everything else. I kept watching as I put it all back together to make sure I would be able to access this small housing once everything else was installed and it can be done. I had to use a T-30 torqs bit that slips into a driver handle with a 1\4" box end wrench to turn the bit when loosening and tighten one side of the housing cover once the turbo was back on but it is possible to be done. A magnet on a flexible rod is needed to retrieve the bit when it falls out of the torqs screw and down between the turbo pedistal though

Once the plug was removed my oil and coolant seem to stay within 3F of each other.
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