An engine mounted within the hull of a vessel, usually driving a fixed propeller by a shaft protruding through the stern. Generally used on larger vessels. See also stern drive and outboard motor.
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CROWN
The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.
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BEARING
A support or guide by means of which a moving part such as a shaft or axle is positioned with respect to the other parts of a mechanism.
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CAM
Eccentric shaft used in most internal combustion engines to open and close valves.
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DEPOSITS
Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.
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ADIABATIC EFFICIENCY
The ratio of actual work output of a heat engine to the ideal output.
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API ENGINE SERVICE CATEGORY
Gasoline and diesel engine oil quality levels established jointly by API, SAE, and ASTM, and sometimes called SAE or API/SAE categories; formerly called API Engine Service Classifications.
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JOURNAL
That part of a shaft or axle that rotates or angularly oscillates in or against a bearing or about which a bearing rotates or angularly oscillates.
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COUPLING
A straight connector for shafts or flow lines.
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OIL RING
A loose ring, the inner surface of which rides a shaft or journal and dips into a reservoir of lubricant from which it carries the lubricant to the top of a bearing by its rotation with the shaft.
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ANNULAR BEARING
Usually a rolling bearing of short cylindrical form supporting a shaft carrying a radial load.
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