Coolant mixing with oil

1987 DODGE RAIDER
85,000 MILES • 2.6L • 4 CYL • 4WD • AUTOMATIC
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GAFFNEYK
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Hello, it was ran overheated for fifteen minutes or so and I cracked the head.
I have since replaced the head with a brand new one. However, I still have coolant mixing with oil. When running it will start to leak within fifteen seconds and when shut off, oil pan is mixed completely. I have drained radiator when replaced head gasket, no oil in my coolant! twice. I thought I did a bad gasket job twice. Do not believe that anymore. Took block to a shop and verified no cracks in block. Timing cover is good. Best guess they had was overheated and I changed water pump at that point. They believe I did not properly seat water pump gasket. I admit that is a possibility. They also offered the possibility I warped my intake manifold and is mixing there. However I have put this motor together twice and want as much advice as possible before going for number three.

Also, they said I need to have cylinder walls bored .020 and block deck re-faced due to small defect between cylinder number four and water tube. defect is right in fire ring area.
Aug 3, 2017 at 3:51 PM
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STRAILER
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Hello,

It sound like the block is cracked up at the camshaft webbing. This is difficult to detect as most shops just do the cylinder bores.

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

Please let us know what happens.

Cheers, Ken
Aug 4, 2017 at 5:55 PM
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GAFFNEYK
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Okay thanks. Not sure what all they did but they are a well known shop who mostly caters to drag strip in town. Is that something repairable? Would it mix that quickly from an undetectable crack in that location? Getting close to scrapping this thing.
Thanks for the help.
Aug 4, 2017 at 6:03 PM
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STRAILER
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Unfortunately it is not that easy to detect. Sometimes you need to fall back 10 and punt.
Aug 5, 2017 at 6:57 PM