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Unread 10-15-2007, 03:56 PM   #1
xj 98/yj 94
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freeze plugs

who has replaced them on thier 5.2? i have a couple about to go, are they easy or hard, how expensive are the parts? i have never done freeze plugs before

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Unread 10-15-2007, 04:31 PM   #2
Vestjam
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I've only done a 4.0. They are not expensive at all. I got a complete kit for less than $10... Most autoparts stores will have them. I used stainless steel, but some think brass is better. I'm not sure I have an opinion one way or the other.

The only issue you are going to have is... having enough room to get to what you need to. The 4.0 was easy. Fortunately, I didn't have to do anything with the one at the rear of the motor.

There are kits to rent (autozone) that will greatly assist you with removal and installation.

You may consider googling 'freeze plug (expansion plug) removal/installation'. There are lots of good articles.

IMO the most important thing to remember if you are doing it yourself is to make sure you have a clean and dry hole before you set the plug. I used Indian Head glue on mine.
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Unread 10-15-2007, 04:40 PM   #3
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Indian Head works great.. the bad part it somehow will end up on you.
wears off by the way
freeze plugs can be a pain, sometimes it involves removal of accessories. Or the engine
hopefully yours are easy
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Unread 10-15-2007, 04:40 PM   #4
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and one will be under a header
fixed that double post
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Last edited by driabyor; 10-15-2007 at 04:53 PM..
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Unread 10-15-2007, 04:43 PM   #5
xj 98/yj 94
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Quote:
Originally Posted by driabyor
Indian Head works great.. the bad part it somehow will end up on you.
wears off by the way
freeze plugs can be a pain, sometimes it involves removal of accessories. Or the engine
hopefully yours are easy

most look like i can get at them from under.. one of them looks like i might need to remove a header tho, that will suck
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Unread 10-15-2007, 04:57 PM   #6
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http://www.permatex.com/images/Displ...otos/20539.jpg
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Unread 10-15-2007, 05:23 PM   #7
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Quote:
Originally Posted by xj 98/yj 94
who has replaced them on thier 5.2? i have a couple about to go, are they easy or hard, how expensive are the parts? i have never done freeze plugs before
When I worked in an automotive machine shop rebuilding heads, engines, etc., the only thing we would use on freeze plugs was Permatex #1.
http://www.permatex.com/products/aut..._1_Sealant.htm
and Permatex still recommends it for that use.
I like the brass plugs, only because they're softer than the stainless (= better seal). When installing, make sure the hole is very clean (as mentioned above). Coat the perimeter of the bore, and the perimeter of the new plug with the sealant. ALSO, coat the back of the plug with sealant. This will protect the back of the plug from corrosives in the coolant.
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Unread 10-15-2007, 05:53 PM   #8
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Quote:
Originally Posted by SJZ
When I worked in an automotive machine shop rebuilding heads, engines, etc., the only thing we would use on freeze plugs was Permatex #1.
http://www.permatex.com/products/aut..._1_Sealant.htm
and Permatex still recommends it for that use.
I like the brass plugs, only because they're softer than the stainless (= better seal). When installing, make sure the hole is very clean (as mentioned above). Coat the perimeter of the bore, and the perimeter of the new plug with the sealant. ALSO, coat the back of the plug with sealant. This will protect the back of the plug from corrosives in the coolant.

how do i pull the plugs out? is it a special tool or do i just take plyers and pull it?
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Unread 10-15-2007, 07:48 PM   #9
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If you can directly to them, ram a prybar or BF screwdriver through it & pry it out.
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Unread 10-15-2007, 08:09 PM   #10
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What are freeze plugs and why would one want to change them? Thanks.
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Unread 10-15-2007, 08:20 PM   #11
Country Boy
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Quote:
Originally Posted by indept
If you can directly to them, ram a prybar or BF screwdriver through it & pry it out.

When I do them on our tractor engines, I just use a very sharp center punch and pop through the center. Works great.
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Unread 10-15-2007, 08:26 PM   #12
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Quote:
Originally Posted by lma1973
What are freeze plugs and why would one want to change them? Thanks.
They are to prevent a frozen engine from cracking the block by popping out if it freezes real bad. Ice expands & could crack it, but the plugs are designed to pop out, relieving the pressure. I've never seen it happen though.
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Unread 10-15-2007, 08:34 PM   #13
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Quote:
Originally Posted by lma1973
What are freeze plugs and why would one want to change them? Thanks.
The correct term for them is actually a "core plug", and is a remnant of the sand casting process by which the block is cast. Since they are usually made of steel (OEM), they corrode and sometimes need to be changed. When boiling out a block during a rebuild, they are removed in order to allow the caustic solution to freely circulate inside the water jacket.
I usually remove them by holding a punch on one side and hitting it with a hammer. The plug will sometimes rotate in the hole & you can use a visegrip to pull them out. If you punch a hole in the plug, you can pry it out. They are usually very easy to remove... if you can get at them.
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