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Old 05-22-2011, 11:18 PM   #1
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Default Freeze plug popping out under boost.

So, I have about 3k miles on this engine and a few months ago, it popped a freeze plug out when rolling into boost. Once the weather got warm, I put it back in and it blew out again. I performed a leakdown test and it showed 30% 40% 45% 50% front to back. Seeing that, I replaced the headgasket. However, that did not fix my issue. Came into boost a couple of times and POP! Coolant exits engine. It is the freeze plug right above the oil filter. I put black RTV on it the first time and the second time I used high tack gasket sealer. Any ideas?

Thanks in advance!
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Old 05-22-2011, 11:29 PM   #2
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Fix your cylinder leakage.
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Old 05-22-2011, 11:33 PM   #3
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I see no mention of post headgasket leak down numbers. You probably have a cracked bore or head.
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Old 05-22-2011, 11:34 PM   #4
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rtv wont hold a freeze plug in either. it's probably too small for one.

and for two, indian head shellac is the bomb.

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Old 05-22-2011, 11:36 PM   #5
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Seal 'em Freeze Plug
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Old 05-23-2011, 09:23 AM   #6
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black RTV is for oil. Ultra Grey is what you should have tried.

but it sounds like youre still pressurizing the coolant system and that's the weak link.
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Old 05-23-2011, 02:17 PM   #7
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Check for hydrocarbons in cooling system pleaze.
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