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The slang term "freeze plug" was coined many decades ago based on the mistaken belief that the primary purpose of the core plugs was to protect the engine block against freezing. Core plugs were initially designed merely as a necessary engine block component which was made necessary due to the "sand casting" method used to initially form an ...
Another option for cold climates is the "freeze tolerant ball valve". This style of ball valve incorporates a freeze plug in the side so in the event of a freeze-up, the freeze plug ruptures, acting as a 'sacrificial' fail point, allowing an easier repair. Instead of replacing the whole valve, all that is required is the fitting of a new freeze ...
Two-stroke engines which use crankcase compression do not require a crankcase ventilation system, since all of the gases within the crankcase are then fed into the combustion chamber. Many small four-stroke engines such as lawn mower engines and electricity generators simply use a draught tube connected to the intake system.
The engine block was revised with structural reinforcing ribs up front eliminating the two freeze plugs (on the front and back) along with an alloy oil pan (for the S-10, Blazer, and Jimmy). The 1996+ cast aluminum oil pan has 12 bolts where a 16-bolt oil pan from the earlier 4.3 does not interchange.
If plain water is left to freeze in the block of an engine the water can expand as it freezes. This effect can cause severe internal engine damage due to the expanding of the ice. Development in high-performance aircraft engines required improved coolants with higher boiling points, leading to the adoption of glycol or water-glycol mixtures.
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