freeze plug


Old 01-27-08, 09:12 AM
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Join Date: Jan 2008
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freeze plug

my husband has a 1993 chevy gc1 truck the freeze plug popped out thelast cold spell we had last week i need to know how to put it back in please help me
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Old 01-27-08, 10:49 AM
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These can be difficult without removing the engine.

You basically clean the area where the old one was, put the new plug in, and hit it dead center with a mallet.

You should address why this happened in the first place. These plugs blow out to relieve pressure in the engine block. I suspect you might have corrosion in the system from using normal household water in the cooling system.
Old 01-27-08, 02:13 PM
Join Date: Mar 2006
Location: USA
Posts: 269
Core Plugs that POP out are usually driven out by the coolant freezing due to a lack of proper coolant mix. If this is what has happened be sure to look at all the plugs because it may have happened to others. Just hope you haven't cracked a head or block. If the coolant was mixed to the proper freeze protection the core plug may have been corroded due to lack of cooling system maintenance. Core plugs seal the holes that are used to dump casting sand from when the item is first manufactured. They are not there for freeze protection as some believe. If your plug is accessable you might be able to replace it without too much effort but some may require major component removal. An installation tool is handy as it prevents the plug from being driven in too far. Use a sealer on the plug also.
Old 01-27-08, 02:40 PM
Join Date: Jan 2008
Location: Tampa
Posts: 5
Found the following info on line this morning while trying to determine my options on my stepsonís Monte Carlo. His is leaking due to rust. Photos were available on-line. His freeze plug is very hard to get to and I may need to remove the inner fender or jack the motor up. Sounds like a weekend job.

Step 1 First find the leaking plug. This may be painfully obvious, or require pressure testing of the cooling system to locate. Remove the old plug. A hammer and punch will work. Place punch at side edge of the freeze plug and apply hammer.

Step 2 Yank the old plug out with a set of pliers. Even though this plug looked fine from the outside the damage is done. Rust is the reason why changing engine coolant according to schedule is a good idea.

Step 3 Clean the freeze plug mounting surface of any rust and crud with a bit of emery cloth.

Step 4 Mount the new plug using either a correctly sized socket or seal driver as shown here. A small amount of sealant on the plug is a good idea.

Step 5 Rubber expansion plugs are available for emergency repairs, or if removal is easier than installation. Do not use sealant on rubber plugs.

I always do as much research as possible before attempting a repair that is unfamiliar. If I do not understand any portion of the information, then I do not attempt any repairs. And use the theory that if it can go wrong then it probably will.

Hope this helped.

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