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Drum Maximum Diameter

The largest diameter, generally 0.060 inch (1.5 mm) over originally to which a brake drum can be machined or worn before it is considered unsafe.

Drum Web

The closed side of a brake drum.

Drum-brake Fade

The loss of braking efficiency due to excessive heat.

Dry

1. The process of changing from a liquid to a solid, as in paint. 2. The process of evaporation, as in water.

Dry Deck

A condition in which the piston crown is at the level of the block deck.

Dry Friction

The friction between two dry solids.

Dry Fuel

A fuel with an additive to prevent water from collecting and freezing in the fuel system.

Dry Gas

Same as dry fuel.

Dry Sump

A form of engine lubrication that uses a separate oil holding tank, rather than the traditional oil pan. A dry sump system typically is used on race cars. It eliminates oil foaming and oil starvation problems, and allows for more effcient cooling and increased oil capacity.

Dry Weight

A vehicle's weight without fluids. See curb weight.

Dry-charged Battery

A battery that is filled with electrolyte only when put into service.

Dry-disk Clutch

A clutch in which the friction faces of the friction disk are dry.

Dry-film Lubricant

A petroleum-based chemical used to lubricate operating parts during assembly, prior to engine start up, to provide lubrication until oil is circulated after start up.

Dryer Drive

A type of starter-motor drive used in heavy-duty applications that provides mechanical meshing means and automatic de-meshing.

Drying Agent

A term used for desiccant.

DS

Distance sensor or Dura-Spark or deceleration solenoid.

DS/CP/TVS

Distributor spark/canister purge/thermal vacuum switch.

DS/TVS

Distributor spark/thermal vacuum switch.

DS/TVV

Distributor spark/thermal vacuum valve.

DS/VDV

Distributor spark/vacuum delay valve.