A smear of epoxy won’t give you the strength that the fillets were there to provide Jeff, and any epoxy pushed down into the crack likely won’t have...
I always leave glue-ups at least overnight regardless of temperature (even where I live in Queensland in Oz where we don’t get your extremes of cold...
It is an oily wood and I’ve generally wiped it down with thinners or acetone just before gluing it (preferably acetone when I’ve had it but any sort...
I’m thinking nice choice on the engine over the Lombardini in the absence of any Yanmar alternative (though it didn’t look like you were considering...