Auto & Shop Information
Automotive essentials
The four-stroke cycle repeats intake, compression, power, exhaust. The power stroke follows the spark plug firing just after compression. Know the supporting systems: ignition (battery, coil, spark plugs), cooling (coolant, radiator, water pump, thermostat), lubrication (oil pump, filter), fuel delivery, and exhaust. The drivetrain runs clutch or torque converter, transmission, driveshaft, and differential. Brakes are hydraulic: master cylinder, lines, calipers or wheel cylinders, with disc brakes squeezing pads against a rotor. The battery starts the car, but once the engine runs the alternator powers the electrical system and recharges the battery.
Shop knowledge
Match the tool to the job: open-end and box-end wrenches, sockets and ratchets, a torque wrench for specified tightness, screwdrivers, pliers, hacksaw, files, taps and dies for cutting threads, and measuring tools such as the micrometer, caliper, and feeler gauge.
Traps
- Mixing up the stroke order, or naming intake as the power stroke.
- Believing the battery powers the car while the engine is running.
- Cross-threading bolts, or over-tightening without a torque specification.
- Mixing metric and SAE sizes.
- Safety items: eye protection, disconnecting power before electrical work, and never using a wrench as a hammer.
Rule of thumb
Right tool, right size, right torque. A wrench that fits snugly prevents rounded bolt heads, the most common avoidable shop error.