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Across
  1. 1. Measures oil level.
  2. 3. Rubber covering on wheel.
  3. 4. Houses brake shoes.
  4. 9. Outer edge of wheel.
  5. 11. Cleans engine oil.
  6. 13. Pressurizes brake shoes.
  7. 14. Reduces rotational friction.
  8. 15. Inside some tires.
  9. 16. Secures wheel to hub.
  10. 20. Allows flexible movement.
  11. 22. Prevents vehicle motion.
  12. 23. Prevents fluid leaks.
  13. 24. Surface of tire.
  14. 25. Side of tire.
Down
  1. 2. Cools turbocharged air.
  2. 5. Secures wheel.
  3. 6. Inflates tire.
  4. 7. Reduces friction.
  5. 8. Friction part in drum brakes.
  6. 10. Supports engine/transmission.
  7. 12. Backup braking system.
  8. 17. Supports wheel structure.
  9. 18. Seals engine components.
  10. 19. Central wheel part.
  11. 21. Engine oil reservoir.