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Charles's Law

A rise in temperature will expand the volume of a gas.

Chase

A process to restore damaged threads.

Chasing Threads

A manual process using a tap or die to restore threads in a nut or on a bolt.

Chassis

The lower structure of a vehicle to which the body and running gear are attached.

Chassis

On an older vehicle, the frame that supports the body, engine, drivetrain and suspension components (e.g., springs and shocks); on newer vehicles, this is actually part of the body structure. Also used as an adjective (e.g., chassis parts) to describe suspension components.

Chassis Dynamometer

A drive-on device, used to measure net road horsepower and torque, delivered by the drive wheels.

Chassis Dynamometer

A machine that measures the power that passes through a vehicle's drivetrain and is transmitted to its drive wheels.

Chassis Dyno

A term often used for chassis dynamometer.

Chassis Ground

In electrical terms, a ground is the desirable or intentional circuit return path. A chassis ground is the desirable return path using the vehicles chassis.

Chassis Lubrication

1.An element of preventive maintenance. 2. The procedure of applying the correct type and amount of grease to the chassis lubrication points at recommended intervals. 3. Adding or changing fluids. 4. Miscellaneous services including tire pressure and safety checks.

Chassis Tuning

Adjusting the running-gear geometry of a vehicle to compensate for different road conditions.

Chassis Waddle

A term often used when describing lateral runout or tire waddle.

Chat

Real-time communication between two or more users via computers

Chat Room

A virtual room where a chat session takes place

Cheater Slick

A tire that is constructed of the same sticky rubber as a racing tire, but has a shallow tread cut into it to make it street legal.

Check

To verify that a component system, or measurement, complies with specifications.

Check Ball

1. A device that maintains air or fuel pressure at a predetermined level. 2. A device that permits the flow of fluid or vapor in one direction only. 3. A type of hydraulic valve, consisting of a ball, that seals an orifice when it is seated and can be used to open the orifice.

Check Engine Light

(CEL) this light is illuminated when the PCM detects a fault.

Check Engine Light (CEL)

This light is illuminated when the PCM detects a fault.

Check Relay

A term often used for check-valve relay or vacuum-check relay.