Freeze Plug pop out!!!!! Its still runs fine after put back. What could this be?
Dec 15, 2008, 07:06 PM
#32
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Freeze plugs have between .010" and .015" of press fit. They don't just fall out. It takes a good deal of force to remove them which you would know if you'd ever tried to get one out on purpose.
That being said, there are two common things that cause them to blow out. The first and most common is an air pocket in the coolant system. If all of the air is not bled out properly, it will form a pocket of air. This pocket will collect steam and build pressure. With no place for the pressure to vent, the freeze plug goes. Usually it's the plug that is on the front right side of the engine because this is where the air likes to collect.
The second cause is detonation. Many people don't believe it to be true but when an engine experiences detonation the block can actually distort. Think of an ice cube tray as the block and the ice cubes being the freeze plug. Twist the tray and the cubes pop right out even though they're in tight. Same thing happens with an engine block.
That being said, there are two common things that cause them to blow out. The first and most common is an air pocket in the coolant system. If all of the air is not bled out properly, it will form a pocket of air. This pocket will collect steam and build pressure. With no place for the pressure to vent, the freeze plug goes. Usually it's the plug that is on the front right side of the engine because this is where the air likes to collect.
The second cause is detonation. Many people don't believe it to be true but when an engine experiences detonation the block can actually distort. Think of an ice cube tray as the block and the ice cubes being the freeze plug. Twist the tray and the cubes pop right out even though they're in tight. Same thing happens with an engine block.
Dec 16, 2008, 01:41 PM
#35
do I have to take the turbo kit out to put this back in? it's over cylinder #4 on the block. I just don't know if this plug that I bought from autozone is the right size (I'm getting an OEM one tomorrow) or if it's impossible to get it in there by hand.
Last edited by JordanS4; Jan 14, 2009 at 12:10 PM.
Dec 16, 2008, 04:32 PM
#36
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No way you will be able to get it in by hand! The plugs have from .010 to .015" of PRESS FIT. That means they are that much bigger than the hole. They have to be hammered in place with a seal driver. They are designed to hold up to the pressure of the coolant system. As stated in my first post, the one near the #4 cylinder is the one that usually blows when there is an air pocket so when you get it back together be sure to bleed the system properly this time. Rubber plugs are meant to be a quick, roadside type fix and are not a permanent solution.
That plug is the right size. The Evo blocks take 35 and 40mm plugs. There is also sealant between it and the block and it is swedged in place.
That plug is the right size. The Evo blocks take 35 and 40mm plugs. There is also sealant between it and the block and it is swedged in place.
