Car Engine Diagram Worksheet (Labeled Parts) — Auto Shop & Physics, Grades 9–12

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Instructions

Read the questions and descriptions in each section carefully. Use your knowledge of car engine parts to complete all three sections of the worksheet.

Part A: Matching

Match the engine part on the left with its correct function on the right. Write the corresponding letter in the blank space provided.

  • 1. Spark Plug
  • 2. Radiator
  • 3. Battery
  • 4. Alternator
  • 5. Piston
  • 6. Air Filter
  • 7. Crankshaft
  • 8. Exhaust Manifold
  • A. Converts the up-and-down motion of the pistons into rotational motion.
  • B. Cools the engine by circulating a liquid coolant.
  • C. A sliding component that moves up and down inside the engine's cylinder.
  • D. Creates an electric spark to ignite the air-fuel mixture.
  • E. Generates electrical power and recharges the battery while the engine is running.
  • F. Collects gases from the cylinders and directs them to the exhaust pipe.
  • G. Provides the initial electrical power to start the engine.
  • H. Cleans the air before it enters the engine for combustion.

Part B: Fill in the Blank

Complete each sentence using one of the words from the word bank below.

Word Bank: Oil Pan, Combustion, Cylinder Block, Lubricate

1. The main body of the engine that houses the cylinders is called the .

2. The rapid burning of the air-fuel mixture that pushes the pistons down is known as .

3. The reservoir at the bottom of the engine that holds the engine oil is the .

4. Engine oil is used to moving parts and reduce friction.

Part C: True or False

Read each statement below. Circle or write 'T' for True or 'F' for False.

  • T / F     1. The alternator's main job is to mix fuel with air.
  • T / F     2. The radiator is part of the engine's cooling system.
  • T / F     3. The battery provides power only when the car is turned off.
  • T / F     4. A dirty air filter can reduce an engine's performance.

Answer Key

Part A: Matching

  1. D
  2. B
  3. G
  4. E
  5. C
  6. H
  7. A
  8. F

Part B: Fill in the Blank

  1. Cylinder Block
  2. Combustion
  3. Oil Pan
  4. Lubricate

Part C: True or False

  1. F (False - The alternator generates electricity.)
  2. T (True)
  3. F (False - It provides the initial power to start the car.)
  4. T (True)
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