3406E block leaking oil out of missing plug hole

Pull the pan and change them all....... done. Guaranteed the other 2 rubber spools are hard as a rock. Only a matter of time.

 

I'd probably wait until the next oil change, but that's what I would do. If 1 fails, the other 2 are not far behind.

 

Truth hurts.......and a good or the correct fix is not often the easy way or the cheap way. Sorry.......at least the parts are cheap. Thumbs

 

I would go and buy 3 plugs. clean around your missing one so its spotless. hit your new one in with some RTV sealant around it. it may need some Vaseline on the leading edge you go to install first.

next oil change quickly whip the sump off and change the other 2 the same way, remove the old one from the sump. wash the sump out and fit it up again.

if you have the big rubber isolator seal for your sump IPD sell one about 40% the price of a cat one and its exactly the same.

on the Brightside, as a reward for your work for the first week everytime you pull the dipstick the oil will be golden instead of black.

 

I lost the one on the left front last week. blew out 4 gallons of oil before I caught it. A man where I stopped had an old c15 or 3406 whatever it was with a plug in it. Had to drive it out with a big punch, clean everything and glue it in with elastomer glue, the gray stuff that smells like piss. Been there for a week , no probs yet. I almost had a freekin heart attack when I saw my pressure at 40 # . Thank God it didn't hurt a thing.