How to remove wrist pins without a press

Removing wrist pins from a piston without a press can be done using alternative methods and tools. Here's a method that uses basic tools you may have access to:

Materials you will need:

  1. Bench vise with soft jaws or protected surfaces (or any stable work surface)

  2. Hammer

  3. Long rod or dowel (to push out the wrist pin)

  4. Safety goggles

Steps:

  1. Safety precautions: Always wear safety goggles when working with metal components to protect your eyes.

  2. Prepare the work area: If you have a bench vise with soft jaws or protected surfaces, secure it to a sturdy workbench or table. Alternatively, if you don't have a vise, you can use any stable work surface.

  3. Position the piston: Place the piston on the work surface with the wrist pin you want to remove facing up.

  4. Support the piston: To avoid damaging the piston skirt, support it from underneath using a piece of wood or any suitable material. This will allow the wrist pin to pass through without interference.

  5. Align the wrist pin: Ensure that the wrist pin is aligned with the hole in the piston so that it can be pushed out in a straight line.

  6. Use the vise (or an alternative method):

    • If you have a bench vise with soft jaws, open the vise jaws wide enough to accommodate the piston but not the wrist pin.

    • Carefully place the piston in the vise with the wrist pin aligned with the gap between the vise jaws.

    • Slowly tighten the vise until it makes contact with the wrist pin.

OR

  • If you don't have a vise, you can use a long rod or dowel and a hammer:

    • Position the piston on a stable work surface with the wrist pin hanging slightly over the edge.

    • Place the long rod or dowel against the end of the wrist pin.

    • Gently tap the end of the rod or dowel with a hammer, applying even pressure to push the wrist pin out. Be patient and tap lightly to avoid damaging the piston or wrist pin.

  1. Remove the wrist pin: Continue to apply pressure (either through the vise or by tapping with the rod) until the wrist pin slides out of the piston. It may require some force, so proceed carefully.

  2. Inspect the components: Once the wrist pin is removed, carefully inspect both the wrist pin and the piston for any damage or wear.

Remember to work slowly and cautiously to avoid damaging the piston, wrist pin, or other components. If you encounter excessive resistance or difficulties during this process, it may be best to seek the assistance of a professional mechanic or engine builder who has access to the proper tools, such as a wrist pin press.

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