Tuesday, 23 April 2024, 10:07 AM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary
J
JackA mechanical or hydraulic tool for lifting a vehicle. Should always be used with axle stands if under vehicle access is needed. |
Jack StandsVehicle 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) NutA 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 SwitchSwitch fitted on a door jamb or pillar for operating the courtesy light or vehicle alarm system. |
JammingThe deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems. Or informal music creation in a group! |
JASJet Air System |
JetA calibrated nozzle in a gas or liquid injection system. In a carburettor used to regulate fuel and air flows. |
Jet NeedleA small needle that works inside a jet (small hole) to control fuel flow in a carburettor. |
JigA device for locating and holding a piece of work during machining operations. |
Jiggle pinMost thermostats have a Jiggle pin. Its function is to allow trapped air past a closed thermostat as a build-up of air in front of the wax capsule could cause engine damage. |
JounceSuspension 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. |
JournalThe surface hardened cylindrical part of a shaft that forms part of a bearing. The journal rotates in round sleeve or split shell bearings. |
JoystickA control stick that operates a system. |
JudderIrregular braking or clutch operation with intermittent snatching. |
Jump LeadsHeavy duty electrical cables used to connect a slave battery to a vehicle with a discharged battery for starting. Also jumper cables. |
Jump StartStarting a vehicle engine with the aid of a slave battery and jump leads. |
Jumper CablesHeavy duty electrical cables used to connect a slave battery to a vehicle with a discharged battery for starting. Also jump leads. |