Glossary “hemispherical combustion chamber” Definition:
Type of combustion chamber that is shaped like half of a circle. This combustion chamber has the valves on either side with the spark plug in the center.
h
hemi
Glossary “hemi” Definition:
Half of a sphere.
hemi cammer
Glossary “hemi cammer” Definition:
Engine having both hemispherical combustion chambers and an overhead camshaft.
Helicoil?
Glossary “Helicoil?” Definition:
Trade name for a screw-thread insert used to repair damaged internal threads.
helmet
Glossary “helmet” Definition:
1). A device worn on the head to protect eyes, face, and neck from arc radiation, radiated heat, and spatter or other harmful matter expelled during arc welding, arc cutting, and thermal spraying. 2). Protective head gear.
helper
Glossary “helper” Definition:
An apprentice type worker that learns by helping an experienced technician.
helper spring
Glossary “helper spring” Definition:
Additional spring device that permits a greater load on an axle.
helical spring
Glossary “helical spring” Definition:
Springs made of bar stock or wire, coiled into a helical form, including compression, extension, and torsion springs.
helical compression spring
Glossary “helical compression spring” Definition:
An open-pitch spring, in a variety of configurations, used to resist applied compression forces.
helical extension spring
Glossary “helical extension spring” Definition:
A spring, usually made of round wire, that exerts a pulling force with various types of end hooks or loops by which they are attached to the load.
helical gear
Glossary “helical gear” Definition:
Gear having teeth cut at an angle across its face, or diagonally to the rotational axis.
Heliarc welding
Glossary “Heliarc welding” Definition:
The act of electrically joining two pieces of aluminum or stainless steel using a high-frequency electric weld and an inert gas, such as argon, that is fed around the weld to prevent oxidation.
helical
Glossary “helical” Definition:
A device, such as a spring, shaped like a helix or spiral.
height sensor
Glossary “height sensor” Definition:
Sensor used to monitor the corner height of a vehicle for the level control system.
height sensing proportioning valve
Glossary “height sensing proportioning valve” Definition:
Proportioning valve in which hydraulic pressure is adjusted automatically according to the vertical movement of the chassis in relation to the rear axle during braking; sometimes also called a weight-sensing proportioning valve.
Heim joint
Glossary “Heim joint” Definition:
A spherical-rod end joint that allows precise adjustment of wheel position.
Heliarc
Glossary “Heliarc” Definition:
The trade name of a tungsten inert-gas form of welding developed by Linde Welding and Cutting Systems.
heel to toe clearance
Glossary “heel to toe clearance” Definition:
Space between the brake drum and the heel and toe of a brake shoe.
HEGO
Glossary “HEGO” Definition:
Heated Exhaust Gas Oxygen sensor.
HEGOG
Glossary “HEGOG” Definition:
Heated Exhaust Gas Oxygen – Ground