the real purpose of freeze plugs is for casting the engine. The hollow passages inside the engine need to be molded with sand. The connections of the sand mold are through the freeze plugs. they bore out the holes and push in light sheetmetal plugs in the holes. There are usually one on the block, below the heads, between each cylinder. some may be on the front/back of the engine also.
They call these freeze plugs, thinking that if water freezes in the engine, it will push out the sheet metal plugs, avoiding damage to the engine casting. They may work that way sometimes, but usually the engine is destroyed. Don't trust them.
Every cast engine will have "freeze" plugs.
Carl
On 3/12/2011 12:11 PM, c24052000 wrote:
doug, What is the purpose of the freeze plug? where is it located?
Do I have one on my 300sd?
Thanks
Chuck
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