A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Jack: A mechanical or hydraulic tool for lifting a vehicle. Should always be used with axle stands if under vehicle access is needed.

Jack Stands: Vehicle support equipment manufactured with a rated weight capacity. Used to support a vehicle when wheels are removed or when access to the underside is needed. Also known as axle stands.

Jam (Lock) Nut: A nut that is used to lock another nut or threaded component in position on a threaded rod or stud. Also lock nut - US term.

Jamb Switch: Switch fitted on a door jamb or pillar for operating the courtesy light or vehicle alarm system.

Jet: A calibrated nozzle in a gas or liquid injection system. In a carburettor used to regulate fuel and air flows.

Jet Needle: A small needle that works inside a jet (small hole) to control fuel flow in a carburettor.

Jig: A device for locating and holding a piece of work during machining operations.

Jo unce: Suspension bump travel due to the wheel hitting an irregularity in the road surface. Also applies when the suspension is pushed down. Also known as bounce.

Jo urnal: The surface hardened cylindrical part of a shaft that forms part of a bearing. The journal rotates in round sleeve or split shell bearings.

Jo ystick: A control stick that operates a system.

Judder: Irregular braking or clutch operation with intermittent snatching.

Jump Leads: Heavy duty electrical cables used to connect a slave battery to a vehicle with a discharged battery for starting. Also jumper cables.

Jump Start: Starting a vehicle engine with the aid of a slave battery and jump leads.

Jumper Cables: Heavy duty electrical cables used to connect a slave battery to a vehicle with a discharged battery for starting. Also jump leads.