what are those holes on my drive

HPLou

Petty Officer 2nd Class
Joined
Sep 15, 2007
Messages
196
Good day.
1989 Alpha One MR s/n OF162055
I have removed both of my Alpha Ones (twin engine) for winter maintenance, painting, etc. While I was scrapping the old paint and hand sanding the drives
I realised there is some kind of holes on both sides of the drives (same on both drives) near the shaft that holds the Cylinders (see pics)
Are those holes for draining water?
hole 1.jpg
 
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