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In an internal combustion engine, a head gasket provides the seal between the engine block and cylinder head(s). Its purpose is to seal the combustion gases within the cylinders and to avoid coolant or engine oil leaking into the cylinders. [1] Leaks in the head gasket can cause poor engine running and/or overheating.
Nikasil was introduced by Mahle in 1967 and was initially developed to allow Wankel engine apex seals to work directly against the aluminum block. [1] This coating allowed aluminum cylinders and pistons to work directly against each other with low wear and friction.
Core plugs can also sometimes prevent freeze damage to the motor. During the early stages of the freezing of the engine coolant a freeze plug will sometimes burst or pop out, and thus allow the coolant to exit the engine, before it might expand within the engine during the freezing process and potentially crack the engine block. [2]
In an internal combustion engine, the engine block is the structure that contains the cylinders and other components. The engine block in an early automotive engine consisted of just the cylinder block, to which a separate crankcase was attached. Modern engine blocks typically have the crankcase integrated with the cylinder block as a single ...
Early steam engines used a hemp packing to seal the combustion chamber, [9] which caused high frictional resistance and did not provide a very effective seal. The first use of a piston ring in the cylinders of a steam engine appears in 1825 by Neil Snodgrass, a Glasgow engineer and mill-owner, for use in his own machines. This used springs to ...
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Previous radiators and engine blocks were properly designed and survived durability tests, but used water pumps with a leaky graphite-lubricated "rope" seal on the pump shaft. The seal was inherited from steam engines, where water loss is accepted, since steam engines already expend large volumes of water.
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