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A little OT: Freeze plugs?
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Posted by JayWalt on March 09, 2007 at 13:29:31 from (70.226.9.210):
Well, as some of you know, i been swapping a tranny in my car. Found a softplug leaking behind the flywheel, which explains the coolant loss. I am kinda leery about using a metal one. Seems that they would be easy to drive in crooked and /or leak. The thing is, if it did leak it would require pulling the motor again, and that is not something i want to do again. I got a rubber compression type plug I plan to use (thses are designed as freeze plug replacements, not just something I picked up from lowes, altho those would probably work too), since it seems more of a secure seal. I will probably put a hair of blue loctite on the nut so there no chance of it coming loose. What are your opinions on this? The plug is thicker then the hole and it meant to form a ridge on the inside so there no chance of blowout. They are rated 50 psi. I'm really not confident in the metal plug. If I had my way, it would be a tapped hole and use a pipe cap, but thats not the case. If it was a softplug on the side of the block, i would use the metal one, and if it leaked, it would be accessible to get the rubber one in there. I did a bit of research on the metal and rubber ones, complaints with both of them, so I'm at a loss. Whoever designed softplugs is an idiot. The holes are for sand casting. When water in the block freezes, it freezes in all directions and does not readily flow to the hole and blow the plug like some people think. Of course theres been cases where ice has blown the softplugs and people assumed they were to prevent blocks from cracking, but that is not the intent, they are for emptying the sand after casting. For "freeze plugs" to be effective, they would have to have them about every 2 inches of the water jacket.
But I digress... Your thoughts please
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