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2. Hydraulic clearance - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_clearance

   Leakage in narrow clearance, spool valve. Hydraulic clearance. Flow in narrow clearances are of vital importance in hydraulic system component design. The flow in a narrow circular clearance of a spool valve can be calculated according to the formula below if the height is negligible compared to the width of the clearance, such as most of the clearances in hydraulic pumps, hydraulic motors ...

3. Valve guide - Wikipedia

   en.wikipedia.org/wiki/Valve_guide

   In the 1980s, many U.S. production engine remanufacturers began reaming valve guides, rather than replacing them, as part of their remanufacturing process. They found that by reaming all the valve guides in a head to one standard size (typically 0.008 in. diametrically oversized), and installing remanufactured engine valves having stems that are also oversized, a typical engine head can be ...

4. Hydraulic cylinder - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_cylinder

   The "generator" side of the hydraulic system is the hydraulic pump which delivers a fixed or regulated flow of oil to the hydraulic cylinder, to move the piston. There are three types of pump widely used: hydraulic hand pump, hydraulic air pump, and hydraulic electric pump. The piston pushes the oil in the other chamber back to the reservoir.

5. Valvetrain - Wikipedia

   en.wikipedia.org/wiki/Valvetrain

   The valvetrain layout is largely dependent on the location of the camshaft. The common valvetrain configurations for piston engines, in order from oldest to newest, are: Flathead engine: The camshaft and the valves are located in the engine block below the combustion chamber.

6. Piston ring - Wikipedia

   en.wikipedia.org/wiki/Piston_ring

   Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image. A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are:

7. Tappet - Wikipedia

   en.wikipedia.org/wiki/Tappet

   A hydraulic tappet, also known as a "hydraulic valve lifter" and "hydraulic lash adjuster", contains a small hydraulic piston that becomes filled with pressurised engine oil. [4] [11] The piston acts as a hydraulic spring that automatically adjusts the tappet clearance according to the oil pressure. Although the movements of the piston are ...