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  2. Parts cleaning - Wikipedia

    en.wikipedia.org/wiki/Parts_cleaning

    Cleaning methods encompass solvent cleaning, hot alkaline detergent cleaning, electro-cleaning, and acid etch. In industrial settings, the water-break test is a common practice to assess machinery cleanliness. This test involves thoroughly rinsing and vertically holding the surface.

  3. Solvent degreasing - Wikipedia

    en.wikipedia.org/wiki/Solvent_degreasing

    Solvent degreasing is a process used to prepare a part for further operations such as electroplating or painting. Typically it uses petroleum , chlorine , dry ice or alcohol based solvents to dissolve the machining fluids and other contaminants that might be on the part.

  4. Hemispherical combustion chamber - Wikipedia

    en.wikipedia.org/wiki/Hemispherical_combustion...

    A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...

  5. Tape head cleaner - Wikipedia

    en.wikipedia.org/wiki/Tape_head_cleaner

    A tape head cleaner is a substance or device used for cleaning the record and playback heads of a magnetic tape drive found in video or audio tape machines such as cassette players and VCRs. [1] These machines require regular maintenance to perform properly.

  6. Heron cylinder head - Wikipedia

    en.wikipedia.org/wiki/Heron_cylinder_head

    The head is machined flat, with recesses only for inlet and exhaust valves, spark plugs, injectors and so on. The combustion chamber itself is contained within a dished depression in the top of the piston. The Heron head is suitable for petrol and diesel engines, for ohv and ohc valve-gear, and for small and large engine displacement capacities.

  7. 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.

  8. Squish (piston engine) - Wikipedia

    en.wikipedia.org/wiki/Squish_(piston_engine)

    In an engine designed to use the squish effect, at top dead centre the piston crown comes very close (typically less than 1 mm [2]) to the cylinder head. The gases are suddenly "squished" out within the combustion chamber , creating turbulence which promotes thorough air-fuel mixing, a factor beneficial to efficient combustion .

  9. Cylinder head - Wikipedia

    en.wikipedia.org/wiki/Cylinder_head

    This is also common for motorcycles, and such head/cylinder components are referred to as barrels. Some engines, particularly medium- and large-capacity diesel engines built for industrial, marine, power generation, and heavy traction purposes (large trucks, locomotives, heavy equipment, etc.) have individual cylinder heads for each cylinder ...

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