Polishing Crank

You're on Page 1 of 2
Go to
  • When I opened my engine up today I noticed that there was some rust carbon build-up on my crank. Is it ok to remove all the build-up by cleaning and polishing the crank?
  • Yes, but it depends on what you're wanting to polish it with.

    Gray, fine-grade Scotchbrite works well for the counterweight.

    Most body shop supply places will have it.

    http://www.rshughes.com/products/048011_04028.html

    Combine with your favorite solvent and or/Dawn and hot water.
  • I usually don't bother polishing anything on a motor but I sometimes do a motor for other people and then I try to make it look a bit more professional. One of my favorite tools is a little paddle wheel sander from dremel. Real smooths and cleans up the face and edges of a crank nice. Not a mirror finish, you would need something finer for that but very nice.

    As for the bore of the crank, I make little rotary sanders out of emery cloth and a dremel mandrel. Tricky to use in such a small hole (I learned this technique from sanding thumb holes in bowling balls) but works quite well.
  • I was thinking of first cleaning up the top layers of build-up w/ a toothbrush, then polish using some red rouge to finish it up.
  • Dremel makes a few different sized green color bits that work well for something like this where you just want to clean and not really remove material. They are rubber or sort of like rubber in material. Mothers mag & alum polish also works as a good 'cleaner' where solvents fail to clean carbon build up from top of piston.
  • Mothers aluminum polish
    I really like the mothers polish, it works great on pipes, I never thought to use it for the inside of the engine. I also use it to polish hinge pins and shock shafts.
  • Quote: I really like the mothers polish, it works great on pipes, I never thought to use it for the inside of the engine. I also use it to polish hinge pins and shock shafts.
    use a wire wheel on a dremel
  • Quote: use a wire wheel on a dremel
    On the crankshaft???
    Will it affect it in any way?
  • Quote: use a wire wheel on a dremel


    Same here.
  • Quote: On the crankshaft???
    Will it affect it in any way?


    Not at all.
  • Quote: use a wire wheel on a dremel
    Wow I never thought I would be able to use that. Thanks for the info guys.
  • Remember to cover the con rod pin with a short
    section of fuel tubing before getting anything abrasive
    near your crankshaft. If you mess up the con rod pin,
    you've ruined your crank.
  • Yeah I know, the crank pin is no touchy touchy. I used the wire wheel w/ great success. Knocked everything clean off.
  • Quote: Remember to cover the con rod pin with a short
    section of fuel tubing before getting anything abrasive
    near your crankshaft. If you mess up the con rod pin,
    you've ruined your crank.
    wirewheel is plenty small enough that you will easily be able to avoid the crankpin journal . you could cover for safety sake if you wanna really git jiggie wit' it though
  • Quote: Yeah I know, the crank pin is no touchy touchy. I used the wire wheel w/ great success. Knocked everything clean off.
    i only say things because i have personally done it and been very successful.

Similar Threads