What goes here? Iron duke 4cyl merc
#23
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Joined: Oct 2005
Posts: 1,077
Likes: 254
From: Waldorf, Md
Sorry I misunderstood my buddy (text conversation). Oil was kind of spitting out of there while the engine was running. Water was coming out of a cracked hose in another spot. He stuck a wire way down that hole and struck clean crankcase oil so it looks like a secondary dipstick hole.
That block was used in some industrial applications too. I would just find a small plug to put in it. You could probably tap it for a 1/8" pipe plug. Put some grease on the tap and you shouldnt get any metal down into the pan.




