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Main
Bearings The main bearing secure the crankshaft in its place.
The largest number of main bearings a crankshaft can have is one more
than the number of cylinders, but it can have one less bearing than
the number of cylinders. Not only do the bearings support the
crankshaft, but one bearing must control the forward-backward
movement of the crankshaft. This bearing rubs against a ground
surface of the main journal, and is called the "thrust bearing."
Maintenance-Free
Battery A sealed battery having no practical provision for the
addition of water to the cells, since periodic maintenance is unnecessary.
Manual
Transmission A mechanism in the drive train with
gears to vary the power and torque delivered to the driven wheels. It
consists of a lever that the driver operates in conjunction with the
clutch to change from one gear to another.
MAP
sensor See manifold
absolute pressure sensor.
Manifold
Absolute Pressure Sensor (MAP) A sensor that
measures intake manifold vacuum to calculate the density of air
entering the engine. The MAP sensor provides information to the
engine management computer so that it can determine the proper
air/fuel ratio.
Master
Cylinder Controls the brake fluid, acting as a reservoir
when you are not applying the brakes.
Mopar
A contraction of "motor parts" that has become a slang
term for Chrysler vehicles, especially those from the musclecar era.
Chrysler's performance parts division is called Mopar Performance.
Motor
see
Engine
Mud
Tire A tire with a special tread pattern that is designed
to provide traction in mud. A mud tire typically will feature large
tread blocks, wide grooves and larger-than-average channels along the
edge of the tire, so it can shed mud, water, gravel and other debris.
Muffler
The muffler serves to muffle the noise coming out of the engine.
Exhaust gases leave the engine under extremely high pressure. If
these gases escaped directly from the engine the noise would be
tremendous. Therefore, the exhaust manifold sends the gases to a
muffler where they go through metal plates, or tubes, with a series
of holes. The pressure of the gases is reduced when they pass through
the muffler, so they go out of the tail pipe quietly. Made of metal,
the muffler is located underneath the body of the car. It is
connected between the tail pipe and the catalytic converter. There
are two types of muffler designs. While one type uses several baffled
chambers to reduce noise, the other sends the gases straight through
perforated pipe wrapped in metal or fiberglass. This type of muffler
is designed for the purpose of reducing backpressure and,
consequently, makes slightly more noise.
Multimeter
An electrical test instrument with the capability to measure
voltage, current and resistance.
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