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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.

Related Terms

A.G.M.A.

Abbreviation for 'American Gear Manufacturers Associations', an organization serving the gear industry.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

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.

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.

ADIABATIC EFFICIENCY

The ratio of actual work output of a heat engine to the ideal output.

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.

FATIGUE CHUNKS

Thick three-dimensional particles exceeding 50 microns indicating severe wear of gear teeth.

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.

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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