Glossary “heel to toe clearance” Definition:
Space between the brake drum and the heel and toe of a brake shoe.
h
hecto
Glossary “hecto” Definition:
Prefix representing the number 100
HEDF
Glossary “HEDF” Definition:
High Electro Drive Fan
H/E-EIS
Glossary “H/E-EIS” Definition:
Hall Effect – Electronic Ignition System
heel
Glossary “heel” Definition:
1). The outermost part of the gear tooth on a ring and pinion gear set. 2). The bottom most portion of a cam on a camshaft.
heel and toe
Glossary “heel and toe” Definition:
The act of applying one’s right toes to the brake pedal while applying the right heel to the accelerator to slow the vehicle as it enters a turn while keeping the engine revved up.
heavy duty truck
Glossary “heavy duty truck” Definition:
Truck having a gross vehicle weight of over 26,000 pounds (kilograms).
heavy duty vehicle
Glossary “heavy duty vehicle” Definition:
Any motor vehicle having a gross vehicle-weight rating over 8,500 pounds (3,856 kilograms), that has a vehicle curb weight over 6,000 pounds (2,722 kilograms), or has a frontal area exceeding 45 square feet (4.2 square meters).
HEC
Glossary “HEC” Definition:
Hybrid Instrument Cluster and Module
heating
Glossary “heating” Definition:
The use of an apparatus that produces a relatively high degree of warmth under controlled conditions, by natural or mechanical means, as an aid to ensure personal safety and comfort.
heating value
Glossary “heating value” Definition:
Measure of heat released when a fuel is burned.
heavy duty (HD)
Glossary “heavy duty (HD)” Definition:
Device or product that is designed for heavy use.
heavy duty coil spring
Glossary “heavy duty coil spring” Definition:
Coil springs having larger wire diameter, and 3 to 5 percent greater load-carrying capability than a conventional spring.
heavy duty shock absorber
Glossary “heavy duty shock absorber” Definition:
Shock absorbers having improved seals, a single tube to reduce heat, and a rising rate valve for precise spring control.
heater core
Glossary “heater core” Definition:
Small water-to-air radiator-like heat exchanger that provides heat for the passenger compartment.
heater valve
Glossary “heater valve” Definition:
Manual or automatic valve in the heater hose used for opening or closing, to providing coolant flow control to the heater core.
heater
Glossary “heater” Definition:
Device used to warm the vehicle interior.
heat treatable alloy
Glossary “heat treatable alloy” Definition:
Any substance whose strength will not be affected by the application of a controlled amount of heat. Usually refers to metals, such as alloys of aluminum or iron (steel).
heat treatment
Glossary “heat treatment” Definition:
Sequence of controlled heating and cooling operations applied to a solid metal to provide the desired properties.
heated air intake system
Glossary “heated air intake system” Definition:
Vacuum operated power door in the air-cleaner snorkel that maintains intake air at a near constant temperature by blending ambient air with heated air picked up from a shroud over the exhaust manifold. Also known as heated air system.