Freeze Plug - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 27 (permalink) Old 01-13-2010, 05:55 PM Thread Starter
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Freeze Plug

What is their actual purpose in the block? Dom, Aaron and I were talking about how many cummins have blown them.

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post #2 of 27 (permalink) Old 01-13-2010, 05:57 PM
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Re: Freeze Plug

their actual purpose is to remove the sand from the casting proccess when making the block.

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Besides there is absolutely no way to idiot proof something, since they are always coming out with better idiots by the day
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post #3 of 27 (permalink) Old 01-13-2010, 06:05 PM Thread Starter
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Re: Freeze Plug

That's what I thought?

So is there a reason they can't be threaded and plugged?

Might have saved Snow White

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post #4 of 27 (permalink) Old 01-13-2010, 06:18 PM
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Re: Freeze Plug

they are to relieve pressure in the event of your coolant freezing so that it does not crack the block. As long as your coolant is mixed properly you shouldnt have any problems

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post #5 of 27 (permalink) Old 01-13-2010, 06:46 PM
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Re: Freeze Plug

What luke said.

cummins pop the rear freeze plug because they have poor coolant circulation and develop hot spots(esp since the rear cyls run hotter on a common rail) and thus develop pressure and pop. Some also think the water pumps pump too much at higher rpms and develop pressure as well.

Freeze plugs can be pinned or tapped or various diffrent things.

on edit, i doubt those woule have saved snow white, if i remember correctly the block cracked, freeze plugs flying out were a side effect.

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post #6 of 27 (permalink) Old 01-13-2010, 06:51 PM
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Re: Freeze Plug

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Originally Posted by aggie View Post
What luke said.

cummins pop the rear freeze plug because they have poor coolant circulation and develop hot spots(esp since the rear cyls run hotter on a common rail) and thus develop pressure and pop. Some also think the water pumps pump too much at higher rpms and develop pressure as well.

Freeze plugs can be pinned or tapped or various diffrent things.


There are several people that have installed threaded plugs and pinned plugs on Cummins engines. There are freeze plugs under the valve covers that IMHO should be tapped and plugged. Many run a plate that covers the back plug and hold it in place. One issue is the belt driven water pumps with higher RPMs. they generate too much pressure in the block and cause some of these issues. That is why many people have "clipped" water pumps or electric water pumps.

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post #7 of 27 (permalink) Old 01-13-2010, 07:47 PM
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Re: Freeze Plug

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Originally Posted by lukecline View Post
they are to relieve pressure in the event of your coolant freezing so that it does not crack the block. As long as your coolant is mixed properly you shouldnt have any problems
I was always told this is a side effect, and freeze plugs DO NOT always save a block from freezing- I have seen or heard of more than a few blocks that were cracked anyway.

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Besides there is absolutely no way to idiot proof something, since they are always coming out with better idiots by the day
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post #8 of 27 (permalink) Old 01-13-2010, 07:48 PM
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Re: Freeze Plug

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Originally Posted by Marty View Post
That's what I thought?

So is there a reason they can't be threaded and plugged?

Might have saved Snow White
another reason a high hp motor may blow a plug is due to the block flexing and the plug being pressed in, some of the above methods may help to not have a problem on the track assuming the motor is in one piece on the big end.

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Besides there is absolutely no way to idiot proof something, since they are always coming out with better idiots by the day
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post #9 of 27 (permalink) Old 01-13-2010, 09:37 PM
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Re: Freeze Plug

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Originally Posted by bluedge8 View Post
I was always told this is a side effect, and freeze plugs DO NOT always save a block from freezing- I have seen or heard of more than a few blocks that were cracked anyway.
I have always been told the same thing, they are casting plugs to empty the sand after making the block. They may or may not save the block from breaking if it freezes.




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post #10 of 27 (permalink) Old 01-13-2010, 09:40 PM
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Re: Freeze Plug

So what are we thinking Marty, big pipe plugs?


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