Glossary “junction block” Definition:
Device on which two or more junctions may be found.
j
junction transistor
Glossary “junction transistor” Definition:
A PNP or NPN transistor formed from three alternate regions of p or n type material. Also called a bi-polar transistor.
junk
Glossary “junk” Definition:
Anything that is so badly worn or deteriorated that it is of no further use.
junkyard
Glossary “junkyard” Definition:
Vehicle salvage business that sells used parts.
jumpers
Glossary “jumpers” Definition:
Term used for jumper cable or jumper wire.
jumpsuit
Glossary “jumpsuit” Definition:
Proper clothing to wear in the paint spraying area.
junction
Glossary “junction” Definition:
1). Contact point between two or more conductors in a circuit, also called a node. 2). The region separating two layers in a semiconductor material, e.g. a p-n junction.
jump
Glossary “jump” Definition:
1). To bypass the ignition switch to start a vehicle. 2). To jump start a vehicle. 3). An obstacle that causes an vehicle to become airborne.
jump out
Glossary “jump out” Definition:
Condition when a fully engaged gear and sliding clutch are forced out of engagement.
jump start
Glossary “jump start” Definition:
Using battery jumper cables to connect an able battery to a disabled battery to start the vehicle.
jumper cable
Glossary “jumper cable” Definition:
Two heavy-duty cables used to connect two batteries, as for starting a vehicle.
jumper wire
Glossary “jumper wire” Definition:
Wire used to temporarily bypass electrical circuits or components for testing purposes.
journal size
Glossary “journal size” Definition:
Finished diameter of a crankshaft journal.
J-rim
Glossary “J-rim” Definition:
A groove around the outer edge of a wheel rim to provide a lock for the tire bead.
JTEC
Glossary “JTEC” Definition:
Jeep/Truck Engine Controller
judder
Glossary “judder” Definition:
Low frequency vibration of the clutch or brakes.
jug
Glossary “jug” Definition:
Term used for carburetor or a cylinder.
jounce/rebound steering gear check
Glossary “jounce/rebound steering gear check” Definition:
Test that involves pushing down on the front or rear of the vehicle to load the suspension, and then allowing the vehicle to bounce back up. It is used to identify damage to the steering gear, column, or tie rods.
journal
Glossary “journal” Definition:
Part of a rotating shaft that turns in a bearing. The surface on a shaft or housing on which a bushing or thrust washer rides, which acts as a support or carrier.
joint fit up
Glossary “joint fit up” Definition:
Refers to holding work pieces tightly together, in alignment, to prepare for welding. It is critical to the replacement of body parts.