You have to drain your entire cooling system then take a punch and hammer and knock the plug sideways, then get pliers and pull it out and punch new one in place after the surface is clean. If it is the engine block frost plug you are refering to
Testimonial: "Good tip. Sound much easier than I thought. "
It depends on how accessible it is. To remove, use a screwdriver and put it on one side of the plug and hit it with a hammer. the plug should go in on the side you hit and stick out on the other edge, then grab it with a pair of vise grips or water pump pliers and pull it out. If you have a straight shot at it, use a metal replacement and a socket that just fits inside to drive it in.
If it's hard to reach, get an expandable rubber plug and install that.(just put it in the hole and tighten the nut on the back to make it expand.)
Testimonial: "Thank you much. Yes it is very inaccessable and the rubber plug will have to do. Great help and impressively quick replies."
Since you are now going to become an expert on "freeze plugs" The actual proper name for them is a welch plug. They are installed in the engine to cover the holes used to remove the stuffing used to keep the water jackets open when the block is cast. Though they often pop out in a freeze up they do not protect the engine from cracking as the pressure exerted by ice is strongest at the bottom of the jacket which causes the outer wall to crack. Most are made from hydro formed steel or a metal stamping and are thinner than the block itself, therefore subject to corrosion from acid buildup in the antifreeze and road salt residue on the outside. In marine engines the plugs are made of brass otherwise they would quickly fail when used in salt water. When I build any engine I always use brass marine plugs as they last pretty much forever. Expandable rubber plugs work well but do not over tighten them. They need to be snug enough so that system pressure does not cause them to blow out but if too tight the rubber can split after a short time. Don't use sealer on the rubber as it acts as a lubricant and can cause them to back out before the sealer dries. They are best installed with all surfaces clean and dry. Coolant remaining in the jacket can be lowered using a small hose as a siphon.
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If you mean the core plugs, you just knock one side of it in towards the block then grab the edge that rotates out with some pliers and pull it out
clean the hole of rust but dont groove the bore or enlarge it by sanding a bunch just a touch up with some emery cloth or equivelent
find a socket or something that just fits inside the cup of the new plug and carefully hammer it in
Testimonial: "Good tip. Just as I thought it would have been. "
The plug is call a freeze plug.
It's design to give out when there is excessive pressure built up inside the engine and to protect the engine block from cracking when the it reach -32F or lower (without the correct coolant mixture).
The plug is brass.
Go to the auto part store and pick up the correct plug.
Use drill,a slap / slide hammer and screw to pop the brass out of the block.
Clean the block.
Use a flat sheet metal to tap the new plug in place.
Top off coolant and check for leak / steam from the block.
Testimonial: "Great detail thank you much. This is good info."
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