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Old 03-17-2012, 10:08 PM   #1
MustangFTW
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Default popped a freeze plug

So I popped a freeze plug earlier this winter, haven't had time to check on it yet but I wanted to know if anyone has heard of a block cracking before a freezeplug pops?

I'll have time tomorrow to check, just wanted to know.
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Old 03-18-2012, 09:49 AM   #2
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"Freeze plug" is a misnomer. Since the "freeze plugs" have nothing to do with protecting the engine from freezing, it's entirely possible that your block could be destroyed by ice, with or without popping plugs.

These devices are actually core plugs, and the holes are the means by which the sand cores are supported when the block is cast.
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Old 03-18-2012, 10:21 AM   #3
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Just replaced two leaking freeze plugs and while discussing the very topic 2+2 mentioned the person I was talking to said he has never seen a "freeze plug" pop when the coolant froze. So yes you could cause severe damage to the block and a freeze plug would never show it.
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Old 03-18-2012, 11:46 AM   #4
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That's great, more good news is that it's the plug behind the engine mount that popped!


I had coolant mixed with water before it got cold so I'm hoping that it didn't freeze, but you never know.


Are there any obvious signs of block damage I could look for?
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Old 03-18-2012, 01:08 PM   #5
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What I would do is check the coolant with a tester just to see what temp it was good for and ease my mind that the plug just rotted and the block probably never froze. If you can't get the engine out to properly replace the plug right now go an get the emergency rubber plug.
Even with the plug behind the motor mount you can jack the engine up with a jack and 2x4 supporting the wide part of the oil pan. Undo the bolts, jack the engine up remove the top mount and get to the plug. Not fun, but doable. I don't know how long i would trust the plug. I just put one in my 67 and have heard people say they drove around forever with them, but i have read that they are just an emergency fix.
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Old 03-18-2012, 03:15 PM   #6
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I popped two of them last winter. Both behind the motor mount on each side. I jacked the engine up, removed the motor mount and put them back in. Nary a problem since. I think they just weren't in very good. They went in pretty easy.
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Old 03-18-2012, 06:35 PM   #7
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That's what I hopped, im thinking supporting with a engine lift might be easier but not sure if I want to get it out of storage... I'll try it out a jack and see how it goes, thanks for the advice.
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Old 03-18-2012, 06:35 PM
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