Knee

See

• Beam Knee

Kneeling feature

A device that is put on a van or bus, which allows the entire right side to become lower thus offering someone who has trouble going up steps easy access to the vehicle.

Kneuter valve

This is the unknown part that causes a car's weird problems that a mechanic cannot find or repair.

Knife

See

• Jack knife
• Putty knife

Knifing stopper

Fine grade filler for minor dents and chips

Knight

See

• Stearns-Knight
• Willys-Knight

KNK

Acronym for Knock sensor

Knob

See

• Choke knob
• Gear knob
• Shifter knob
• Spinner knob

Knobby

See

• Knobby tire

Knobby tire

On a Bicycle or Motorcycle, a heavy-duty tire with large rubber knobs spaced relatively far apart to provide Traction in wet, muddy terrain.

Knobby tires

See

• Knobby tires

Knock

1. A general term used to describe various noises occurring in an engine; may be used to describe noises made by loose or worn mechanical parts.
2. Preignition, or Detonation.

Also see

• Anti-knock agent
• Bearing Knock
• Carbon knock
• Diesel knock
• Engine knock
• Fuel knock
• Preignition

Knock additive

See

• Anti-knock agent

Knockback

1. The action of a brake disc with excessive runout pushing back the brake pads when the brakes are not applied
2. Brake caliper piston retraction caused by rotor runout driving a piston back into its bore when the brakes are released.

Knock control

A device which retards the spark advance when detonation occurs. The retard mode is held for a certain time, typically 20 seconds, after which the knock control reverts to normal operation

Knocker

A colloquial term for a Panel puller

Knocking

1. Noise created by part movement in a loose or worn bearing.
2. A condition, accompanied by an audible noise, that occurs when the Gasoline in the Cylinders burns too quickly. This is also referred to as Detonation.

Knock limit

The degree of spark advance before detonation

Knock off

A single, large Wing nut for fastening a wheel to the hub. Easily removed and replaced, it is struck (knocked off) with a mallet on the wings. Also called a spinner.

Knock-off wheel

A splined-hub wheel with one central locking nut (Spinner) which is knocked on and off with a soft-headed hammer

Knock-on

A Knock off nut

Knock resistance

See

• Octane number

Knock sensor

(KNK or KS) a piezoelectric accelerometer mounted on the engine to detect the high-frequency vibrations caused by detonation. Since an engine gives the best power and efficiency as it approaches detonation, the knock sensor can relay this information to a computer which can control the factors leading to detonation. Also called Detonation sensor

Knot

A unit of speed in nautical mile (6,080 feet or 1,852 meters) per hour.

Knuckle

1. The joint of a hinge through which the pin passes
2. The hinged joint between two rods or tubes.

Also see

• Ball joint steering knuckle
• Reverse Elliot Steering Knuckle
• Steering knuckle
• Steering Knuckle Angle

Knuckle angle

See

• Steering knuckle angle

Knuckle arm

See

• Steering arm

Knucklehead

Term for Harley-Davidson's first overhead-valve Big Twin, introduced in 1936

Knuckle pin

See

• Kingpin

Knurl

1. A series of small ridges on nuts and knobs to provide a grip for fingers.
2. A rough or decorative surface on part of a fastener.
3. To indent or roughen the finished surface of a piece of metal by pressing a series of cross-hatched lines into the surface and thereby raising the area between these lines.

Knurled nut

A thumb nut with knurled sides

Knurling

Roughening with knurls

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