How to Polish an Aluminum Motorcycle Crankcase

Written by adam raphael
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How to Polish an Aluminum Motorcycle Crankcase
Keep your motorcycle well maintained and shiny. (motorcycle image by Bionic Media from

The crankcase of a motorcycle is different from other aluminium parts of the vehicle. It usually comes with a smooth, shiny finish, unlike the matt, gravely finish that other parts have. This means that cleaning and polishing it is not only easy but also satisfying because you will have a beautiful, shiny crankcase when you are finished. You need to clean the crankcase prior to polishing it, but you can cheat by running the part through a dishwashing cycle!

Skill level:
Moderately Easy

Things you need

  • Cloth
  • Mild soap
  • Metal polish
  • Microfiber cloth

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  1. 1

    Wipe down the crankcase with a cloth and mild soap to remove as much dirt as you can.

  2. 2

    Run the crankcase through a normal cycle on your dishwasher and let it dry thoroughly.

  3. 3

    Apply a small amount of metal polish to a microfiber cloth. Rub the polish onto the crankcase in small concentric circles and work your way all around.

  4. 4

    Add more polish to the cloth as you use it up, until the surface of the case is fully covered with polish.

  5. 5

    Buff the polish to a shine with a clean portion of the microfiber cloth until the crankcase is clean and shiny.

Tips and warnings

  • Polish your crankcase regularly to ease the work you will have to do each time.
  • Test your dishwashing detergent on a spare aluminium part to make sure it doesn't damage the finish.

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