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2. Head gasket - Wikipedia

   en.wikipedia.org/wiki/Head_gasket

   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.

3. Leak-down tester - Wikipedia

   en.wikipedia.org/wiki/Leak-down_tester

   Leak-down testing is a static test. Leak-down tests cylinder leakage paths. Leak-down primarily tests pistons and rings, seated valve sealing, and the head gasket. Leak-down will not show valve timing and movement problems, or piston movement related sealing problems. Any test should include both compression and leak-down.

4. Internal combustion engine - Wikipedia

   en.wikipedia.org/wiki/Internal_combustion_engine

   A head gasket prevents the gas from leaking between the cylinder head and the engine block. The opening and closing of the valves is controlled by one or several camshafts and springs—or in some engines—a desmodromic mechanism that uses no springs.

5. Rocker cover - Wikipedia

   en.wikipedia.org/wiki/Rocker_cover

   A rocker cover gasket (valve cover gasket in the US and Canada) is used to seal the joint between the cover and engine head. Failure of the gasket can cause oil to leak from the engine. A head gasket is used to seal the joint between the head and the engine block.

6. Crankcase ventilation system - Wikipedia

   en.wikipedia.org/wiki/Crankcase_ventilation_system

   Gaskets and shaft seals were intended to limit the leakage of oil, but they were usually not expected to entirely prevent it. The blow-by gases would diffuse through the oil and then leak through the seals and gaskets into the atmosphere, causing air pollution and odors. The first refinement in crankcase ventilation was the road draught tube.

7. Disney Investigating Data Leak After Hackers Post Alleged ...

   www.aol.com/disney-investigating-data-leak...

   Disney is investigating a hack of the entertainment company’s internal Slack channels. A hacker group called Nullbulge claims to have obtained and leaked more than 1 terabyte of data from Disney ...