Question about 1992 Nissan 240SX Fastback

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What is a freeze plug

Can you tell me what a freeze plug is and where it is located in a 1992 nissan skyline

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Your engine is water cooled and therefore has water travelling around the engine block. 
A freeze plug is an expansion plug located in the side of an engine block that is supposed to protect the block against freezing conditions. Water expands when it turns to ice, and if the coolant does not have enough antifreeze protection it can freeze and crack the engine block. The freeze plugs (there are usually several of them) are supposed to pop out under such conditions to relieve the pressure on the block.
Most of the plugs to be found on an engine are actually to plug the holes where sand cores have been held. The sand cores are used in the casting process to form internal cavities in the engine block or cylinder head, for cooling water for example, and so should really be referred to as core plugs.

Freeze plugs can often be a source of troublesome leaks as a result of internal cooling system corrosion. Ease of replacement depends on accessibility. In many cases the plug area will be difficult to reach and using a mallet to perform maintenance or replacement will be nearly impossible without special facilities. Expanding rubber plugs are available as replacements when access is a problem.
Hope that helps...

Posted on Aug 21, 2008

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