Automotive Glossary

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S

Slinger

(1) A plate fitted on a rotating shaft in front of an oil seal to reduce the volume and pressure of the oil on the seal. (2) A plate or protuberance on a crankshaft for throwing oil onto the cylinder walls or other components.

Slip

Loss of grip between two frictional faces.

Slip Angle

The difference between the true line and the actual line of a vehicle wheel when cornering.

Slip Ring

Continuous ring of copper used with a brush to transmit electricity through a rotating component.

Sludge (Oil)

Lubrication oil deterioration where the oil thickens, mixes with contaminants and forms a thick and glutinous jelly or paste.

Sludging

Description of what happens to oil if it is not changed as recommended - a sludge forms that looks like Mississippi mud!

Smart Card

A card issue to an authorised user to access the MOT database via the VTS Device.

Smoke Meter

Opacity meter used to measure the amount of smoke in diesel engine exhaust gases.

SN

Special Notice – an official notice issued from time to time by VOSA to inform AEs, NTs and other system users of changes to the testing scheme. SNs may also be used to highlight areas of concern and to advise of developments of the scheme.

Snail Cam

A cam that is shaped like a snail shell. In other words it has more effect the further it is turned.

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