how to remove press fit pins

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Use the appropriate shims between each side of the rod and each pin boss to avoid tweeking the piston. If your tossing the pistons you can cold press the pins out of the rods. You can use apropane torchto gently warm the small end of the rod to help relieve some of the press fit.

People also ask


  • How many press-fit pins can be used per assembly operation?

  • Second rule of press fits: never more than two pins per assembly operation. Even better, use only one interference fit and align the parts with a slip-fit second pin. If you must use two press-fit pins, be certain to use GDT tolerancing, with the first hole as the datum for the second hole, to minimize error between the two features.

  • Do you need to lubricate pins when press-fit?

  • While pins may or may not require a tiny amount of lubrication, other parts need a more significant amount to enable a good press-fit, claims Brieschke. Wide and long bushings, for example, need to be lubricated all around to help them insert smoothly into respective sleeves.

  • How to remove a stuck dowel pin?

  • Pull the dowel pin straight out without angling or wiggling it. Keep squeezing the exposed end of the pin in the pliers. Pull straight away from the hole to try and remove the tight dowel pin. Avoid angling or wiggling the pliers while you attempt to pull the pin out. You might damage it and make it get even more stuck.

  • Can I use two press-fit pins for interference?

  • Even better, use only one interference fit and align the parts with a slip-fit second pin. If you must use two press-fit pins, be certain to use GDT tolerancing, with the first hole as the datum for the second hole, to minimize error between the two features.

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