Glossary “maintenance specifications” Definition:
A listing of oil change intervals and lube grades, service points, and capacities for periodic routine preventative maintenance service.
m
MAIR
Glossary “MAIR” Definition:
Managed Air Injection Reaction
major diameter
Glossary “major diameter” Definition:
1). Largest diameter of a cylinder. 2). The largest diameter of a bolt, its threads.
Maintenance Awareness Program (MAP)
Glossary “Maintenance Awareness Program (MAP)” Definition:
A coalition of automobile repair shops, suppliers, car companies, and associations, dedicated to building trust between the aftermarket and its customers.
maintenance-free battery
Glossary “maintenance-free battery” Definition:
Sealed battery having no practical provision for the addition of water to the cells, since periodic maintenance is unnecessary.
maintenance manual
Glossary “maintenance manual” Definition:
A manufacturer’s or independent publication containing comprehensive maintenance information for a certain vehicle.
mainline pressure
Glossary “mainline pressure” Definition:
Pump developed, hydraulic regulated pressure that operates apply devices, such as bands, and is the source of all other pressures in an A/T.
mains
Glossary “mains” Definition:
Term used for main bearings and main cap.
main jets
Glossary “main jets” Definition:
Nozzle(s) in a carburetor that provides fuel during part or full throttle operation.
main journals
Glossary “main journals” Definition:
Journals that fit into the engine block to support the crankshaft.
main leaf
Glossary “main leaf” Definition:
Usually the top leaf on multiple-leaf springs that provides the main vehicle support and contains the spring-mounting “eyes.”
main body structural components
Glossary “main body structural components” Definition:
The assembly made up of the dash panel, underbody, roof, body panels, doors, and deck lid to form the passenger and luggage compartments.
main bearings
Glossary “main bearings” Definition:
Bearings that locate and support the crankshaft in an engine block.
main cap
Glossary “main cap” Definition:
Structural device that holds the crankshaft in place in an engine block.
magnetism
Glossary “magnetism” Definition:
Natural or electrical ability to attract a ferrous metal.
magneto
Glossary “magneto” Definition:
An electrical device requiring no outside power source, that generates and delivers current to fire the spark plugs.
mags
Glossary “mags” Definition:
Wheels.
main
Glossary “main” Definition:
The main bearing.
main bearing journal
Glossary “main bearing journal” Definition:
The parts of the crankshaft on which it rotates in the cylinder block.
magnetic poles
Glossary “magnetic poles” Definition:
Point at which the magnetic lines of force enter or leave a magnet.