Threaded hole in the top of my 3.0 XL

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oddcarout

Cadet
Joined
May 17, 2012
Messages
21
I went to un-winterize my boat and have found rust all over my engine, and have seen things I have never seen before. towards the front of the engine, on the top of the block is a threaded hole, pic attached, it has some debris in it that I had not cleared out when I took the picture. Does anyone know what this is for or if is should be plugged/used?

1997 Mercruiser 3.0XL

Thank you
 

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alldodge

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
42,947
Most all older blocks can have a hole not used, main reason is something was attached which now is no longer needed.

Might have been a hose clamp
 
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