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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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The objective of this Web Page is to familiarize you with basic auto maintenance
-  in some common emergencies -
not to make you an expert in auto mechanics

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