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Hit & Miss Gas Engine Discussion

Advice needed on polishing steel crank throws


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  #1  
Old 12-26-2013, 10:50:41 PM
Martin Reed Martin Reed is offline
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Default Advice needed on polishing steel crank throws

I have a cut steel crank that is nice enough to polish but I don't want to use power tools because they would damage the original machining marks. Does anyone have a relatively easy method for removing light rust and polishing the crank throws? Any assistance would be appreciated, thanks.

Martin
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  #2  
Old 12-26-2013, 11:14:18 PM
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Craig A Craig A is offline
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Default Re: Advice needed on polishing steel crank throws

It looks more than good as it is.......
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Old 12-26-2013, 11:17:07 PM
Hal Rosenquist Hal Rosenquist is offline
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Default Re: Advice needed on polishing steel crank throws

Hi Martin, for a light rust removal project like you have pictured I use a Scotchbrite pad by 3M and some good ol WD 40. Hal
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Old 12-27-2013, 12:02:42 AM
Lester Bowman Lester Bowman is offline
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Default Re: Advice needed on polishing steel crank throws

Take a 3/8 inch diameter rod about eight inches long.Slot on end with a hacksaw about two inches.Take course steel wool and work it into the slot.
Put the now dangerous attachment into an electric drill.Now use common sense and note the rotation of the rod.Let the steel wool wrap itself around the rod.Add more steel wool..it will attach itself.Idea is a big ball of course steel wool and using it like a wire brush.As it wears away add more wool.Be careful.Wear goggles.It makes a mess.But it does put a nice shine on things.Be careful!
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Old 12-27-2013, 12:28:04 AM
KevinGWeq KevinGWeq is offline
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Default Re: Advice needed on polishing steel crank throws

To remove the rust I have had good luck with just some light oil,wd40 etc and scotchbrite by hand ,Then follow up with some metal polish, but to really polish it the machine marks , at least most of them are going to disappear , Your crank journal looks beeeyootiful ,and that fantastic shine was accomplished by a fine cut and progressively finer cuts ,

Kevin
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Old 12-27-2013, 08:19:51 AM
Martin Reed Martin Reed is offline
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Default Re: Advice needed on polishing steel crank throws

Gentlemen,

Thanks for all of the advice, I'll try a little bit of everything to see what works best.


Martin
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Old 12-27-2013, 10:05:30 AM
Jason Dahm Jason Dahm is offline
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Default Re: Advice needed on polishing steel crank throws

I'd use some Scotchbrite and some sort of light lubricant (kerosene or diesel fuel) and a little more of whatever was in the green bottle in the background! Happy Holidays! Jason
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Old 12-27-2013, 11:38:30 AM
KevinGWeq KevinGWeq is offline
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Default Re: Advice needed on polishing steel crank throws

Since we are talking about polished crankshafts, If the crank journal is micro polished for use on our old engines ,would the polishing have a negative effect on the journals ability to hold lubricants, ie: oil or grease
I am thinking the ultra smooth surface may want to sling the lube off quickly, whereas a surface with a little more ''tooth'' would tend to hold the lube better ????
I don't know but I would like too.

Kevin
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Old 12-27-2013, 02:10:51 PM
Martin Reed Martin Reed is offline
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Default Re: Advice needed on polishing steel crank throws

10-4 Jason, that's what I am going to end up doing!
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  #10  
Old 12-27-2013, 03:23:25 PM
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grub54891 grub54891 is offline
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Default Re: Advice needed on polishing steel crank throws

Quote:
Originally Posted by froelich View Post
Ya mean like this?

http://winbergcrankshafts.com/

Scotchbrite pads on a DA sander.
Holy smokes! I want ine just for a display!
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Old 12-27-2013, 08:58:41 PM
Mike Unwin Mike Unwin is offline
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Default Re: Advice needed on polishing steel crank throws

A rag and toothpaste not too abrasive and cleans up easy.http://gardentractortalk.com/forums/...model-x/page-2
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Old 12-27-2013, 09:49:50 PM
Martin Reed Martin Reed is offline
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Default Re: Advice needed on polishing steel crank throws

It's 9:50, not much going on, I'm going to the garage and try the tooth paste right now. I'll give you a report in about 30 minutes.



Martin
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Old 12-27-2013, 10:05:04 PM
HBurk HBurk is offline
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Default Re: Advice needed on polishing steel crank throws

I'm gunna have to teach you to tell time agin.
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Old 12-27-2013, 10:12:35 PM
Martin Reed Martin Reed is offline
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Default Re: Advice needed on polishing steel crank throws

oops, 8:50, still on daylight savings....

Well, tried the tooth paste and I was pleasantly surprised, it worked to a certain extent. It was slowly removing some of the rust so I went with a stiffer brush and it helped a little more. I then picked up a scotchbrite pad and some WD40, that worked even better, it's still going to take a lot of time. I'm going to try the steel wool this weekend.

Martin
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