DICTIONARY OF AUTOMOTIVE TERMS - "Jo"

Job

A particular piece of work.

Also See
botched-up job
lube job
piston ring job
ring job
valve job

Job queue

The lineup of work that a mechanic or shop intends to do in a particular order.

Jockey pulley

1. On a bicycle, the pulley in a rear derailleur that stays closest to the freewheel cogs and guides the chain from cog to cog during a gear shift.
2. A free-turning, spring-loaded idler used to keep tension on the timing belt. Also called "jockey wheel"

Jockey wheel

A wheel used to maintain tension in a chain or belt.

Also See
jockey pulley

Joggle

1. A slight step along the edge of a panel to provide a level mounting and welding surface so that it can be overlapped against the adjacent panel for subsequent lap or spot welding.
2. To join by means of a joggle

Joggler

A metalworking tool used for creating a joggle

Joiner work ceiling

The overhead finished surface in quarters, etc.

Joint

1. The place where two pieces meet when a structure is made of smaller pieces.
2. A flexible or firm connector between two rods.
3. Connecting point as between two pipes.
4. The location at which two adherends are held together by an adhesive.
5. Points of connection between heat transfer surfaces; between positive and negative pressure zones within components of the power plant; and between power plant components.

Also See
ball joint
ball joint rocker arm
ball joint steering knuckle
ball universal joint
bevel joint
butt joint
cardan joint
cold solder joint
constant velocity joint
constant velocity universal joint
corner joint
CV joint
doughnut joint
dry joint
edge joint
flange joint
half-moon slip joint pliers
hardy-spicer joint
hardy-spicer universal joint
heim joint
homokinetic joint
hooke joint
impact swivel ball universal joint
lap joint
plunging joint
pot joint
Rzeppa-type joint
Rzeppa-type universal joint
sliding joint
slip joint
splined joint
T-joint
tripod joint
U-joint
U joint
universal joint
velocity joint

Joint boot

See
cv joint boot

Jointed shaft

See
universally jointed shaft

Joint pliers

See
half-moon slip joint pliers

Joint rocker arm

See
ball joint rocker arm

Joint separator

See
ball joint separator

Joint socket

See
universal joint socket

Joint splitting tool

See
ball joint separator

Joint steering knuckle

See
ball joint steering knuckle

Joint venture

An international business collaboration between foreign interests and private parties from a host country in which two or more parties establish a new business enterprise to which each contributes and where ownership and control are shared.

Jolting

The effect caused by harsh clutch release. The car body jerks repeatedly in a longitudinal direction

Jordan

A vehicle brand of which only the Speedway Series "Z" of 1925-1948 are classic cars.

Joule

(J) The international metric unit of measurement of energy, work, and heat. One joule equals the work done when a force of 1 newton moves a body 1 meter.

Joule's Law

The rate of heat production by a steady current in any part of an electrical circuit that is proportional to the resistance and to the square of the current, or, the internal energy of an ideal gas depends only on its temperature.

Joule-Thomson effect

The change in the temperature of a gas on its expansion through a porous plug from a higher pressure to a lower pressure.

Jounce

The action of bouncing. When speaking of shock-absorbers, it is the compression stroke while rebound" is the opposite.

Jounce and rebound

See
bump and rebound

Jounce buffer

See
jounce bumper

Jounce bumper

An elastic cushion used to stiffen the suspension gradually as it approaches the end of its jounce travel. Also called "jounce buffer."

Also See
bump stop

Jounce bumpers

Elastic cushions used to stiffen the suspension gradually as it approaches the end of its jounce travel.

Also See
bump stop.

Journal

That part of a shaft that is prepared to accept and support a bearing. The area on the crankshaft that fits into the lower portion of the connecting rod. A layer of oil and metal bering cushions the impact during the power stroke to prevent the crankshaft from being crushed by the swiftly descending piston and connecting rod.

Also See
camshaft journal
crankshaft journal

Journal, crankshaft

Part of shaft which contacts the bearing on the large end of the piston rod.

Joyride

1. A reckless drive in a stolen car.
2. To go for a joyride

Joyrider

Someone who goes for a joyride