Kitchener, On for reference. A couple weeks ago I did my winterization oil change, stabilized, fogged the motor, drained the block. Given I am paranoid I usually pull the stat and fill with antifreeze on a yearly basis. This year when I pulled the tstat off and after I got the block/housing cleaned up I noticed 1 large and 2 small score marks on the block where the t-stat housing attaches. Pic attached for reference. I can fit my fingernail in the large one! I think I have enough surface left that I am not too concerned...just don't want this getting worse.
Edit: I should mention the crack isn't right through the block it's just a 1-2mm deep.
Any idea how this happens? I swear I do _not_ remember these from last year! Is it possible this is mechanical damage from the t-stat popping, other? It hasn't been _that_ cold here here yet....maybe -1C overnight worst case and my boat is garage stored so I highly doubt this would be free damage yet but who knows.
Edit: I should mention the crack isn't right through the block it's just a 1-2mm deep.
Any idea how this happens? I swear I do _not_ remember these from last year! Is it possible this is mechanical damage from the t-stat popping, other? It hasn't been _that_ cold here here yet....maybe -1C overnight worst case and my boat is garage stored so I highly doubt this would be free damage yet but who knows.
