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Sea Gull

One at a drag race that complains or squawks all the time.

Seal

1. A device used around a rotating shaft to prevent fluid or vapor leaks. 2. A gasket-like material used between two or more parts to prevent fluid or vapor leaks.

Seal Weld

A weld designed primarily to provide a specific degree of tightness against leakage.

Sealed Battery

A term used for maintenance-free battery.

Sealed Beam Headlight

A self-contained glass unit made up of a filament, an inner reflector, and an outer glass lens.

Sealed Bearing

A replaceable bearing, such as those found on many rear axle shafts or at the front of alternator rotor shafts, that is lubricated and permanently sealed by the manufacturer to contain the grease while keeping out contaminants.

Sealed Fuel Pump

A permanently sealed, non-serviceable pump that has its body and cover crimped together.

Sealer

A thick, tacky compound used as a gasket or to seal small openings or irregularities between two mating parts.

Seamless

Steel tubing with absolutely no seam where a leak may occur and no restrictions internally to cause fluid flow to be restricted.

Seasoned Part

A part that has been stress relieved.

Seat

1. The surface on which another part rests. 2. To wear to a good fit. 3. The bench-like unite one sits on in a vehicle.

Seat Adjuster

A device that permits fore and aft and/or up and down movement of a vehicle's front seat.

Seat Back

The upright portion of a vehicle seat.

Seat Belt Warning System

A warning device to alert the driver and occupants to fasten their seat belts and/or shoulder harness.

Seat Of The Pants (SOP)

Driving by sheer instinct where instruments cannot be used to determine speed or distance.

Second Gear

The intermediate or kick down passing-gear range of a transmission.

Secondary Air

Air that is pumped to the pollution-control devices to promote chemical reactions that reduce exhaust gas pollutants.

Secondary Air Injection

An emissions system designed to pump fresh air into the exhaust stream to reduce HH and CO emissions.

Secondary Available Voltage

High voltage that is available to fire the spark plug.

Secondary Brake Shoe

The rear brake shoe in a drum-brake set that is energized by the primary shoe and increases self-energizing action of the brakes.