C HAPTER 1. The Automobile. Parts, Assemblies, and Systems. What is an auto part? (n) auto part , car part (a component of an automobile) What is an assembly? a group of machined parts that fit together to form a self-contained unit What is a system?
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(n) auto part, car part (a component of an automobile)
a group of machined parts that fit together to form a self-contained unit
A set of fitted parts designed to complete a function
Common Automotive Sensors
Oxygen Sensor: A device that detects the amount of oxygen in the exhaust stream and sends that information to the ECM for proper fuel control
Coolant Temperature Sensor: Measures the cooling system temperature and sends a variable voltage signal to the ECM
Throttle Position Sensor: Sends a signal to the ECM telling it the position of the throttle valve or gas pedal
Air Intake Temperature Sensor: Tells the ECM the outside air temperature
MAP Sensor: A manifold absolute pressure sensor (MAP) tells the ECM air pressure measured inside the intake manifold
RPM Sensor: Tells the ECM the engine speed
Crankshaft/Camshaft Sensors: Small magnetic sensors that send the ECM pulsing signals that vary with crank and cam movement indicating their precise positions.
Common Output Devices
Idle Speed Controller: Controls the engine idle speed
Fuel Injectors: Spray precise quantities of fuel into the engine
Fuel Evaporative Solenoid: Opens to let fuel tank vapors into the engine to be burned during driving
Ignition Coil(s): Creates the spark to fire the spark plugs
Starter Relay: Closes to allow the engine to start
Radiator Fan: Turns on to cool the engine coolant
Check Engine Lamp: Turns on to let the driver be aware that there is a malfunction somewhere within the system
The purpose of an automotive cooling system is to speed engine warm-up, and maintain a consistent engine temperature .
The function of an automotivelubrication system is to circulate filtered oil to high friction points in the engine. The lubrication system also helps cool the engine by carrying heat away from the engine.
Theoil pump pulls oil out of the pan forces it throughout the engine to lubricate and cool various moving parts within the engine.
The suspension components of a Ford Model T
The steering system allows the driver to control the direction of the vehicle by turning the wheels from left to right. There are basically two styles of vehicle steering systems, rack and pinion and worm gear box (or recirculating ball). Rack and pinion steering is one of the oldest types of steering systems and is still used today. Inside the rack body a flat rack gear moves in a linear direction driven by a circular gear called a pinion. The steering wheel is connected to the pinion gear (shaft).
A-Brake Fluid Reservoir
B-Brake Rotor or Disk
F-Parking Brake Cable
G-Rear Wheel Cylinder