Any of a number of systems which characterize lubricants according to viscosity for particular applications, such as industrial oils, gear oils, automotive engine oils, automotive gear oils, and aircraft piston engine oils.
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A.G.M.A.
Abbreviation for 'American Gear Manufacturers Associations', an organization serving the gear industry.
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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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CROWN
The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.
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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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FATIGUE PLATELETS
Normal particles between 20 and 40 microns found in gear box and rolling element bearing oil samples observed by analytical ferrography. A sudden increase in the size and quantity of these particles indicates excessive wear.
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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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FATIGUE CHUNKS
Thick three-dimensional particles exceeding 50 microns indicating severe wear of gear teeth.
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HYPOID GEAR LUBRICANT
A gear lubricant having extreme pressure characteristics for use with a hypoid type of gear as in the differential of an automobile.
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BLOW-BY
Passage of unburned fuel and combustion gases past the piston rings of internal combustion engines, resulting in fuel dilution and contamination of the crankcase oil.
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