Oil from cooler to water pump outlet?

Hank3

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Doing engine swap and with 7.3 ps out I put new gaskets and o-rings on oil cooler. Engine is back in truck now but, I just replaced the water pump yesterday and there’s oil coming thru the neck that attaches to lower radiator hose. Only happens when I crank engine. Did I do something wrong or maybe something is broken?

Didn’t think there was any other way of putting oil cooler back together. Seems like coolant should be coming out where the oil is.
 

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