Auto Parts That Start With M

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Magneto

The Magneto is an electrical generator that generates power for the spark plug by creating a high-voltage pulse periodically. It typically consists of five parts, namely the armature, primary coil, secondary coil, electronic control unit, and a pair of strong permanent magnets. To generate a strong magnetic force, the magnet spins in close proximity to the primary coil. The primary coil then holds back the magnetic force until it generates a high voltage in the secondary coil that ignites the spark plug, firing the engine.

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Main Bearing

The main bearing supports the crankshaft, allowing it to rotate when the engine is running. It’s usually mounted in the crankcase.

The upper part of the main bearing is equipped with an oil groove on the inner surface. It typically has a hole for passing oil to the feed holes in the crankshaft.

Some main bearings have thrust bearing elements supporting axial loads and preventing movements along the crankshaft axis. These types of main bearings are called flange main bearings.

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Main Bearing Gasket Set

A Main Bearing Gasket Set includes the main bearing gasket and other parts required to attach it to the main bearing. The parts included typically depend on what vehicle make and model the set was designed for. The main bearing gasket that’s included in the set serves to connect one of the engine’s main bearings to the crankshaft. This prevents oil from leaking out from that point while also holding the main bearings to the crankshaft.

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What are Rod Bearings? Causes & Symptoms of Failure Explained

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Main Relay

The main relay is an electronically controlled switch that connects the vehicle’s fuel system to the powertrain control module (PCM), controlling it when the ignition is turned on.

The main relay is typically in the fuse box, which in turn is usually under the passenger-side dashboard of the engine bay. Because this part is so important, a vehicle with a failing or malfunctioning main relay might not be able to start at all.

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Electrical System

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Mainshaft

The mainshaft is a critical component inside a vehicle’s transmission and it’s sometimes called the output shaft. The mainshaft receives power from the engine and transmits it to whichever gear is engaged. Many other critical transmission components like the individual gears and synchromesh are mounted on the mainshaft. The mainshaft has several metal grooves where these components are mounted. The mainshaft also has channels that allow transmission oil to flow and reach the transmission’s nooks and crannies.

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Transmission System

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Mainshaft Bearing

The mainshaft bearing supports the transmission mainshaft. This part might be needed if you’re repairing or replacing a faulty mainshaft or its bearing to restore or improve its performance. Mainshaft bearings fit around the mainshaft, and their light weight helps maintain their performance. The mainshaft needs this bearing to spin at the required speed without interruption.

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Driveshaft Bearing

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Mainshaft Seal

The Mainshaft Seal is a rubber gasket that prevents engine oil from leaking out from a vehicle’s mainshaft, which delivers power to the differential. Like most gaskets, it’s designed to withstand high temperatures and pressures. By preventing oil leakage, the mainshaft seal protects the transmission system from running on low oil, which is dangerous for driving. The mainshaft seal is circular with a hole in the center. Their rim fits fully around both the inside and outside of the mainshaft sides. Some mainshaft seals also have a groove in their sides to more securely fit around the mainshaft.

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Mallet Hammer

Mallet hammers are tools used to hammer components without damaging them. Their heads are usually made of rubber or wood. Rubber mallet hammers are quite useful when you’re hammering dents on your vehicle’s bumper or body. The rubber face prevents your vehicle’s bodywork from being scratched or dented. A mallet hammer can also help push rubber tires back onto a steel rim, since tires tend to be quite stubborn. Mallet hammers can also have other applications where you need more elbow grease.

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Build Your Toolkit, Fix Your Ride: Starter Repairs & Tools

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Manifold Absolute Pressure Sensor

The manifold absolute pressure (MAP) sensor is a device that measures the pressure level in the air intake manifold. You might need this part to replace the current or stock MAP sensor if it is behaving erratically or has stopped working. MAP sensors are typically mounted beside or on the throttle body in non-forced induction engines and on the intake tract before the turbocharger in forced induction engines. The powertrain control module (PCM) uses the MAP sensor readings to help the fuel injection system inject enough fuel to achieve the best air-fuel ratio.

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Manifold Absolute Pressure Sensor Connector

The Manifold Absolute Pressure (MAP) Sensor Connector is an electrical component that connects the MAP sensor to the wiring harness, allowing the sensor to send signals to the powertrain control module (PCM). The MAP sensor monitors the amount of vacuum in the intake manifold, alerting the PCM if it needs to adjust fuel flow and engine timing accordingly. Without a functioning MAP sensor connector, your engine might hesitate, idle rough, and emit black smoke from the tailpipe.

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Manual Transmission Blocking Ring

The Manual Transmission Blocking Ring is a type of synchronizer that adjusts the input shaft’s speed to match the speed of the gears. This part might be needed to replace a bad blocking ring that causes issues like grinding gears. Manual transmission blocking rings fit between each pair of gears and ensure proper synchronization between the parts. The transmission relies on the manual transmission blocking ring to ensure smooth shifting between gears.

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How to Take Care of Your Manual Transmission

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Manual Transmission Gear Synchro Ring Retainers

Manual Transmission Fluid

Manual transmission fluid is a lubricant that prevents metal-to-metal contact between two parts. Compared to automatic transmission fluid, manual transmission fluid is thicker and has additives intended to withstand extreme friction and pressure.

Manual transmission fluid is also known as synchromesh transmission fluid (STF). It also contains additives that help ease shifting activities under extremely cold temperatures.

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Manual Transmission Gasket Set

A manual transmission gasket set is composed of several gaskets that are mounted on the gaps of a transmission case. Transmission gaskets are necessary to prevent transmission fluid from leaking between the transmission case gaps, which can cause the transmission to excessively wear out and overheat. Transmission gaskets are typically made from silicone rubber and fluoroelastomer, which can handle high-temperature operation.

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Manual Transmission Gear

A Manual Transmission Gear helps distribute torque from the engine. It converts motor input to an output force that’s distributed to other transmission components.

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Manual Transmission Input Shaft

The Manual Transmission Input Shaft transfers torque from the clutch disk to the countershaft.

A typical input shaft is made from heat-treated hardened steel and comes with the main drive gear as part of one assembly.

The input shaft spins at engine speed. It’s also connected to the output shaft via needle bearings.

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Manual Transmission Overhaul Kit

A manual transmission overhaul kit contains the components needed to rebuild or overhaul a manual transmission. It can include gaskets, seals, bearings, and other related parts commonly replaced during a transmission rebuild.

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Manual Transmission Shift Fork

A shift fork is a key component of a manual transmission responsible for engaging and disengaging the gears. This U-shaped metal component moves the synchronizer sleeve to select the desired gear.

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Manual Transmission Synchro Assembly

A Manual Transmission Synchro Assembly ensures smooth gear changes when driving a manual (stick-shift) vehicle. It typically has a slider, keys, balls, struts, and blocking rings. The synchronizer adjusts shaft speeds and aligns gears when you shift gears. This allows the slider to mesh smoothly with the next gear.

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How Does a Synchromesh Gearbox Work? Diagrams Included

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Manual Transmission Synchro Sleeve

The Manual Transmission Synchro Sleeve is one of the key components in the synchronizer unit. It selects the gear and moves with the gearshift mechanism before the dog teeth engage. This allows for a smooth, crunch-free selection. The most common type is the cone clutch or blocker ring design.

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What Are Transmission Synchronizers?

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MAP Sensor

The manifold absolute pressure (MAP) sensor is a device that determines engine load. A MAP sensor can be a ceramic capacitor diaphragm, an aneroid bellows, or a piezoresistive crystal.

One side of the MAP sensor has a sealed vacuum reference, while the other side is vented to the intake manifold. Pressure changes in the intake manifold cause the sensor to deflect and send information to the powertrain control module.

As the air pressure increases, the MAP sensor generates a higher voltage.

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MAP Sensor Adapter

The MAP sensor adapter is a part that allows a vehicle’s manifold absolute pressure (MAP) sensor to be used in conjunction with other types of intake manifolds that do not have the appropriate MAP sensor mounting points. This part might be needed if you have compatibility issues after your vehicle’s intake manifold has been replaced, as MAP sensors are mounted on a vehicle’s intake manifold. The MAP sensor helps measure how much air is entering the engine’s intake. The powertrain control module (PCM) needs this information for it to properly set engine variables such as ignition timing.

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Car MAP Sensors

MAP Sensor Repair Kit

The manifold absolute pressure (MAP) sensor repair kit contains parts and components required for replacing old or faulty MAP sensors. While the exact content varies between products, the typical repair kit contains a MAP sensor, a wiring connector, and a wiring harness. You need a MAP sensor repair kit when the MAP sensor in your vehicle shows signs of issues, such as sending inaccurate readings to the powertrain control module (PCM). You can usually find the MAP sensor on your vehicle’s intake manifold.

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Engine

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MAP Sensor Seal

The Manifold Absolute Pressure (MAP) Sensor Seal is a protective seal that prevents air or vacuum leaks between the MAP sensor and the intake manifold. Without it, your vehicle’s MAP sensor is likely to pick up incorrect readings that can interfere with the air-fuel mixture and ignition timing of your engine. MAP sensor seals come in different sizes and materials that can vary depending on your vehicle’s year, make, and model.

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Mass Air Flow Sensor

Mass air flow sensors monitor air mass by weight in a given time. It determines the mass flow rate of air entering a fuel-injected internal combustion. The powertrain control module (PCM) uses this information to balance and deliver the correct fuel mass to the engine.

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Ignition System

Symptoms of a Bad Mass Air Flow Sensor

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Mass Air Flow Sensor Connector

The Mass Air Flow Sensor Connector is a component of the mass air flow sensor. It connects the sensor to the vehicle. The mass air flow sensor measures airflow that enters the internal combustion engine. This allows the engine control unit to make adjustments to the amount of fuel allocated to the engine to prevent it from running rich or lean.

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Mass Air Flow Sensor Gasket

The mass air flow sensor gasket seals the gap between the mass air flow sensor and the intake manifold. The gasket is supposed to provide an airtight fit around where the mass air flow sensor is located. Without a proper gasket, the mass air flow sensor might get erratic or incorrect readings, since air can leak out of the engine’s intake manifold. This can ultimately affect engine performance and efficiency since the mass air flow sensor plays a role in determining the engine’s air-to-fuel ratio.

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Mass Air Flow Sensor Mount

The mass air flow (MAF) sensor mount is a part that acts as the attachment point for the MAF sensor. This part might be needed if you’re building a custom air intake or need to replace the stock or current MAF sensor mount. Mass air flow sensor mounts are usually located between the air filter and the throttle body. The MAF sensor needs a mount that will securely hold it while it measures the airflow heading into the engine.

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Mass Air Flow Sensor O-Ring

The Mass Air Flow Sensor O-Ring is a ring-shaped gasket that creates a leak-free seal between the air box and the mass air flow (MAF) sensor, which measures the amount of air entering the internal combustion engine. This seal helps the MAF take accurate measurements, allowing it to estimate the amount of fuel mass needed for a balanced air-fuel ratio. The MAF sensor o-ring is also known as the air mass sensor seal, the fuel injector air flow meter gasket, or the breather o-ring.

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Master Bushing Kit

A Master Bushing Kit is a large set that includes bushings of different sizes and shapes. The bushings have various sizes so they can fit on different pivot points between two moving metal parts in a vehicle’s steering and suspension systems. Each bushing cushions vibrations, reduces wear, provides space for compression, and reduces noise at each pivot point. Bushings are made from rubber or polymer. The exact number and type of bushings sold in a master bushing kit vary depending on the kit manufacturer and distributor.

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Master Cylinder Repair Kit

The Master Cylinder Repair Kit is a set of tools and components necessary to repair a vehicle’s faulty master cylinder. A typical kit will allow drivers to replace or upgrade the pistons, springs, and seals of their brakes.

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Braking System

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Media Adapter

The Media Adapter is a vehicle accessory that connects different media devices to a vehicle’s speakers. These adapters can also power these devices. Media adapters come in different forms, but are often wired USB ports that physically connect to the media devices. As opposed to built-in USB ports, media adapters aren’t typically included with a vehicle right out of the gate. They’re instead sold in auto shops and computer stores.

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Mirror

The mirror helps drivers see other vehicles in adjacent lanes, helping them make a safe turn or switch lanes properly.

A typical vehicle has a pair of side mirrors and a rearview mirror, which helps drivers spot other cars behind them. Mirrors are also used when backing or parallel parking.

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Mirror Arm

A mirror arm is a protruding piece of metal that holds up a vehicle’s side mirror. Mirror arms are only used in old vehicles, since most modern vehicles have complete side mirror assemblies that mount directly onto the chassis. Mirror arms are typically screwed or bolted onto the chassis. Meanwhile, the mirror is also mounted on the arm. Depending on the vehicle, mirror arms can be chrome-plated or painted black.

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Mirror Back

The mirror back is the rear part of the car mirror assembly. This part might be needed if the current or stock mirror back is damaged or worn out. Mirror backs are part of the car mirror assembly, and they cover the mirror’s internals. The car mirror relies on this part to improve its aerodynamic profile and protect fragile parts.

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Mirror Base Gasket

The Mirror Base Gasket is a gasket installed under the door mirror. It prevents paint damage and minimizes vibration, protecting the mirror from wear and your paint job from scratches. Mirror base gaskets can be purchased individually, allowing you to replace the rubber gasket without having to buy an entire mirror assembly. They come in different shapes and sizes, so be sure to get the one that fits your vehicle. Most mirror base gaskets are sold individually.

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Mirror Cover

The Mirror Cover houses a vehicle’s side mirrors, protecting them from impacts and weather. Mirror covers also usually match the rest of the vehicle’s body to create a cohesive appearance. They also typically have sleek designs to reduce excess drag. Some mirror covers also house signal lights. When connected to a foldable arm, mirror covers can sit almost flat against the vehicle’s door when the vehicle is parked. This reduces the risk of the protruding mirrors getting hit by passing vehicles and pedestrians.

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Mirror Glass

The mirror glass is the reflective surface of your vehicle’s side mirrors. Mirror glasses are typically attached to the side mirror using silicone or double-sided adhesive tape. Some mirror glasses can be heated, which allows them to withstand fogging in cold weather. Since side mirrors can be knocked inward, mirror glasses are meant to be impact-resistant.

Mirror glass can convex or concave, which can provide a narrower or wider field of view. The passenger’s side mirror is typically convex to magnify objects in your field of view. Meanwhile, the driver’s side is flat, giving the driver an accurate reflection of what’s behind your vehicle.

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Mirror Motor

The mirror motor is attached to the back of the mirror glass and mounted onto the side mirror assembly. It’s what lets drivers adjust the angle and position of the side and rearview mirrors using the controls.

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Mirror Mount

The Mirror Mount secures your vehicle’s mirror in place, so that it doesn’t move around as you drive. You can find mirror mounts for different types of car mirrors, including mounts that are specifically designed for auxiliary mirrors. Some mirror mounts have holes to accommodate the wire connectors of heated power mirrors. Rearview mirror mounts usually have a 360-degree-rotation feature that allows you to adjust the mirror according to your preferences.

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Mirror Switch

The mirror switch lets drivers remotely adjust their vehicle’s power mirrors with the help of buttons, switches, and knobs. It makes it easier to ensure the mirror gives the driver a great look at their surroundings.

The mirror switch is typically found on the left-hand side of the dashboard.

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Mirror Trim

The Mirror Trim is the side mirror component that helps hold the mirror glass and mirror together. This part might be needed if the current or stock trim has come loose or looks worse. The mirror trim fits around a vehicle’s side mirror and helps protect the mirror glass and mirror from minor damage. The mirror needs the trim to improve its looks and prevent damage.

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Mirror Turn Signal Light

Mirror Turn Signal Lights are turn signal lights that are integrated into the side mirrors. Not all vehicles are equipped with these. The main function of these lights is to make your vehicle visible to other drivers when turning or changing lanes.

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Car Lights

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Motor and Transmission Mount Bolt

The motor and transmission mount bolts are fasteners that hold the engine and transmission in their proper place on the chassis. Motor and transmission mount bolts are quite large to keep the engine and transmission, which are the heaviest vehicle components, properly held in place as the vehicle moves.

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Motor Mount

The motor mount keeps the engine in place, protecting it from potential damage brought about by vibrations and collisions. It’s made of shock-absorbent materials like rubber to dampen impact and prevent friction from metal-to-metal collision.

Vehicles usually have three to four motor mounts underneath the hood where the engine is housed.

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Motor Oil

Motor Oil or engine oil is a lubricant that helps cool engine parts, seal piston rings, reduce friction between moving parts, and prevent rust and corrosion.

Motor oil often comes with additives that help protect and improve the performance of the base oil. It comes in different viscosity levels designed for different makes and models.

Motor oil containers should always have an appropriate SAE, API, and ILSAC rating.

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Mud Flaps

Mud flaps, also known as mud guards, prevent mud, dirt, salt, and other debris from damaging your truck’s body. Aside from protecting your vehicle, these flaps also serve as a protective shield so that the debris kicked up by your rotating tires won’t hit pedestrians and other vehicles.

Mud flaps are usually installed behind the wheels of a vehicle.

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Muffler

The Muffler is designed to silence engine exhaust noise. It catches large bursts of high-pressure exhaust gas from the cylinder to smooth out the pressure pulses and allow them to be released at a constant rate. It does so with the help of perforated tubes within the muffler chamber. Afterward, the smooth-flowing gasses are released into the tailpipe.

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Muffler Bracket

The Muffler Bracket, also known as the exhaust hanger, is a component that keeps the muffler and other exhaust pipes from falling off.

Clunking noises when going over speed bumps can be a sign that the exhaust pipes are bouncing against the bottom of the vehicle or are being dragged along the road.

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Muffler Clamp

The muffler clamp is a part that secures different parts of the exhaust system, such as the exhaust pipe and muffler. Also called the exhaust clamp or saddle clamp, this part might be needed to secure loose exhaust parts. Muffler clamps are attached to the vehicle’s undercarriage and fit around the exhaust pipe, and they help keep parts tightly connected and free of leaks. Exhaust parts need muffler clamps to keep them from excessive movement while you drive your car.

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How To Install Different Types of Exhaust Clamps

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Muffler Clamp Kit

The Muffler Clamp Kit is an exhaust clamp kit that typically consists of two metal clamps, a sealing gasket, a clamp ring, nuts, and bolts. The metal clamp secures the muffler to the heater box or J Tube and the tailpipe to the muffler. It seals the exhaust connection to the engine while preventing other parts from loosening. Over time, the muffler clamp can wear and cause leaks and damage other parts.

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What are the Best Mufflers?

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Muffler Delete Pipe

The Muffler Delete Pipe is a metal pipe that replaces a muffler in a muffler delete custom modification. Muffler delete involves removing the muffler entirely in order to improve performance and sound. Without a muffler delete pipe, exhaust gases would escape from the system beneath the vehicle, where the muffler once was, rather than out the back exhaust pipe. The muffler delete pipe fills the gap that the removed muffler leaves in the system, ensuring the exhaust gases reach the exhaust pipe.

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Muffler Delete: What Is It and Why Is It Illegal?

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Muffler Gasket Set

The Muffler Gasket Set includes tools and components that let people install a gasket on their vehicle’s muffler. This prevents leakage and seals the muffler so no exhaust fumes leak into other parts of the vehicle. The fumes created during combustion must exit solely through the exhaust to prevent poisoning the driver, passenger, and passersby with carbon monoxide.

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Muffler Hanger Bracket

A Muffler Hanger Bracket is a component that supports and secures the muffle to the underside of the vehicle. Keeping the muffler in place reduces transmission vibrations and noise in the chassis.

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Muffler Hanger Kit

The Muffler Hanger Kit contains the muffler hangers and the various parts required to install them. The muffler hangers in the kit hold the vehicle’s muffler up, preventing it from scraping on the ground. Muffler hangers are either made of rubber or a combination of rubber and steel. Muffler hangers often have two halves, one that attaches to the vehicle and one that links to the muffler itself.

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Muffler Hanger Strap

The muffler is the component responsible for reducing engine sound along the exhaust pipe. The muffler hanger strap fits around the muffler’s inlet or outlet and keeps it in place underneath your vehicle. More importantly, it prevents the muffler from hitting the ground as it can bob up and down. The muffler strap typically uses a hook that attaches to the exhaust hanger so that it doesn’t move. Over time, the muffler hanger strap can wear out and create a rattling noise.

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Muffler Mount

The muffler mount secures the muffler and other exhaust parts. Also called an exhaust mount, this part might be needed if the muffler vibrates and makes noise because its mount wore out or went missing. Muffler mounts attach to the area above the supported exhaust parts and reduce noise and vibration. Exhaust parts like the muffler last longer because the muffler mount prevents excessive vibration that wears these parts out.

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Muffler Strap

The Muffler Strap is a metal strap that secures the muffler to the exhaust system. It fits around the inlet or outlet of the muffler, where it bolts around the exhaust pipe. Most muffler straps use a hook to attach to the exhaust hanger, ensuring the muffler is more stable and secure. It’s typically made from stainless steel or high-quality metal, but you can also buy a rubber protectant piece that fits inside the strap separately.

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Multi Display Gauge

The Multi Display Gauge is a single gauge found on a vehicle’s dashboard that shows readings from multiple sensors. On classic vehicles, they can be used to consolidate and replace multiple gauges. Multi display gauges often show a combination of fuel levels, oil levels, water levels, and voltage. These multi display gauges can be either mechanical or digital. Many mechanical gauges also mimic older gauge styles to suit classic vehicles.

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Multi Purpose Relay

The Multi Purpose Relay is an important electrical component that allows power from the car battery to flow to different electrical systems, such as the headlights, fuel pump, and cooling fan. It also lets sensors send signals to switches or controls. Over time, the multi purpose relay can wear, preventing the electrical system from functioning properly. When buying a replacement, make sure to double-check if it’s compatible with your car. Relays can vary in size, ampere, connector gender, and number of terminals.

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Electrical System

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Multimeter

The Multimeter is a tool that’s used to run diagnostics on a vehicle. It measures voltage, amperage, continuity, and resistance in electrical components and circuits. It is often used to check the state of charge of a vehicle battery.

A digital multimeter comes with two electric connectors with metal probes. The red wire is the positive connector, while the black wire is the negative connector.

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