Posted by Dan on November 11, 2006 at 09:12:50 [URL] :
In Reply to: Re: Welsh (Freeze) Plugs on a 9N Engine posted by Joe T on November 10, 2006 at 21:36:02:
Freeze plugs are the "common" name for these plugs. In theory - if water turned to ice and expanded in the block, some thought this plug would pop out and allow the expanding ice to have a pressure release. In reality - it does not work like that. These holes were put in place as a way to remove the required sand in the block casting process. These metal plugs just seal the hole back to watertight.
HTH,
Dan
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