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Old 03-16-2014, 05:10 PM
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coolant in oil NOT oil in coolant

Customer truck showed up not running with broken Degas coolant hose. repaired hose filled with coolant and pressure checked. Started truck and blowing white smoke. Coolant was losing pressure so a bad EGR and possible head gasket was most likely cause. pulled cab and stripped motor, installed new oil cooler, EGR delete, FORD head gaskets and ARP studs. checked out the heads real good for possible cracks and found no signs of cracks and no sign of obvious head gasket failure. replaced dummy plugs and stand tubes and stc connector. reassembled whole motor dropped cab and started. White smoke out the exhaust like a freight train and coolant in oil. Spoke with customer again and now after some prying admits engine overheated and shut off. I am suspecting there is a crack in head somewhere that I am not seeing. Any thoughts?
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Old 03-16-2014, 08:41 PM
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Either that or crack in block, did you have the heads sent out to be checked to see if there warped or did you only do a visual check?
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Old 03-17-2014, 02:44 AM
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coolant in oil NOT oil in coolant

visual only, I have looked at lots of heads over the years and am pretty good at spotting cracks. I am thinking this may be up in valve seat behind the valve and thats why I am not seeing it. Hoping its not the block. Have seen motors with cracks in the liners down below the piston. Pulling cab tonite and dropping exhaust manifold to see which side. Thanks
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Old 03-17-2014, 05:54 AM
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Also have alook at your front cover gaskets and cover itself.
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Old 03-17-2014, 09:40 AM
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front cover wouldnt explain the white smoke coming out the exhaust. My thoughts are head, gasket, or block. Have seen lots of cavitation damage in heavy equipment over the years. Not pretty to say the least. one of the worst was a CAT loader that eroded where the liner sits in the block and seals. That was an expensive fix.
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Old 04-26-2014, 10:15 AM
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Did you ever figure out what it was? Having same issue with my 6.0. Its freshly rebuilt and its driving me nuts. Itll at like its hydrolocking blow white smoke then clear up. Pulled valve covers and covered in sludge from coolant in the oil. Thanks
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