How to Get a Freeze Plug Out

Freeze plugs serve two purposes. Back in the days before everybody used antifreeze in their cooling system, the freeze plug was supposed to prevent the engine block from getting cracked if the water in the engine froze. As the water froze and expanded, it would hopefully push out the freeze plug. The other purpose of a freeze plug is related to the casting process. When the engine block is cast, holes are left in the block and the freeze plugs fill the holes. Unfortunately, freeze plugs are made of steel and will rust out, leak and require replacement.

Instructions

1

Park the vehicle on a level, paved surface and set the parking brake.

2

Use a hammer and punch to tap one end of the freeze plug into the engine block. As you do this, the opposite end of the freeze plug will rotate out of the engine block.

3

Grab the edge of the freeze plug that is sticking out with a pair of pliers and work the plug out of the block.