Re: more on freeze plugs - Saab 900 Bulletin Board - Saabnet.com
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Re: more on freeze plugs
Posted by RayJ [Email] (more from RayJ) on Wed, 19 Nov 2008 13:46:08
In Reply to: more on freeze plugs, AzSaab, Tue, 18 Nov 2008 21:23:55
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Agreeing with Justin, the openings in the engine casting, sealed with "freeze plugs" are in reality a way for the sand casting plugs included in the casting molds to produce coolant passages in the block to be voided from the block casting. Early antifreeze, isopropyl alcohol, or worse salt brine were largely not capable of halting freezing of the coolant, hence the bulging and relief of freeze pressures by these pop out steel plugs gained them the name of "freeze plugs". Because they are steel, highly corrodable, they will start leaking, in an engine that has not had adequate corrosion protection, either with coolant treatment, or anti freeze with treatment.
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