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Old 11-08-2009, 08:02 PM   #1
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Default Polishing Crank

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?
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Old 11-08-2009, 08:15 PM   #2
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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.
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Old 11-08-2009, 08:21 PM   #3
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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.
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Old 11-08-2009, 08:44 PM   #4
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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.
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Old 11-08-2009, 10:12 PM   #5
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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.
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Old 11-08-2009, 10:17 PM   #6
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Default 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.
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Old 11-08-2009, 10:23 PM   #7
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Quote:
Originally Posted by merdith6 View Post
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
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Old 11-09-2009, 02:22 AM   #8
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Quote:
Originally Posted by houston View Post
use a wire wheel on a dremel
On the crankshaft???
Will it affect it in any way?
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Old 11-09-2009, 06:48 AM   #9
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Quote:
Originally Posted by houston View Post
use a wire wheel on a dremel


Same here.
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Old 11-09-2009, 06:48 AM   #10
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Quote:
Originally Posted by vti-chris View Post
On the crankshaft???
Will it affect it in any way?


Not at all.
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Old 11-09-2009, 07:13 AM   #11
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Quote:
Originally Posted by houston View Post
use a wire wheel on a dremel
Wow I never thought I would be able to use that. Thanks for the info guys.
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Old 11-09-2009, 07:47 AM   #12
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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.
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Old 11-09-2009, 03:58 PM   #13
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Yeah I know, the crank pin is no touchy touchy. I used the wire wheel w/ great success. Knocked everything clean off.
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Old 11-09-2009, 04:07 PM   #14
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Quote:
Originally Posted by rageworks View Post
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
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Old 11-09-2009, 04:09 PM   #15
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Quote:
Originally Posted by pyromania View Post
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.
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