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11-15-2021, 04:35 PM | #1 |
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Join Date: Jun 2021
Location: Yorktown, Va.
Posts: 29
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Surface corrosion on crank
I am in the process of buying a great 31 crank shaft which is stock sized, never reground. It has slight corrosion that I know can be cleaned up by hand. How would I do that, what would I use to do it?
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11-15-2021, 04:58 PM | #2 |
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Join Date: May 2010
Posts: 1,304
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Re: Surface corrosion on crank
I cut a strip of 2000 grit 3 M paper and apply WD 40 .I cut the strip the same width of the journal and long enough that I can rotate it around the journal while I pull it too and fro .
John in Suffolk County England . |
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11-15-2021, 05:36 PM | #3 |
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Location: Santa Rosa, CA
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Re: Surface corrosion on crank
crocus cloth as well.
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11-16-2021, 01:10 PM | #4 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
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Re: Surface corrosion on crank
Ditto on the crocus cloth.
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11-16-2021, 04:51 PM | #5 |
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Location: Melbourne, Australia
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Re: Surface corrosion on crank
What the $%^ is crocus cloth??? I've never come across it.
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11-16-2021, 05:45 PM | #6 |
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Re: Surface corrosion on crank
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11-16-2021, 07:57 PM | #7 |
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Join Date: Jun 2014
Location: Melbourne, Australia
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Re: Surface corrosion on crank
OK, got it - it's a rusty rag!
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11-17-2021, 06:23 AM | #8 |
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Location: Western North Carolina
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Re: Surface corrosion on crank
I have used crocus cloth on journals and it works great. See https://www.mcmaster.com/crocus-cloth/
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
11-17-2021, 07:28 AM | #9 |
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Join Date: May 2010
Location: Grafton,OHIO
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Re: Surface corrosion on crank
I have crocus cloth that looks like fresh picked cotton in a can. Never knew it came like rolled paper.learn something new all the time
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11-17-2021, 09:02 AM | #10 |
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Join Date: May 2010
Location: Pine, AZ
Posts: 794
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Re: Surface corrosion on crank
Went to hardware store in Payson, AZ and no one knew what I was asking for. Have used it several times on cranks and other shafts. It is great.
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11-17-2021, 11:48 AM | #11 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,042
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Re: Surface corrosion on crank
Never knew it came like that. Learn something new all the time.
A picture or link would be appreciated. Got nowhere fast doing a web search.
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If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! |
11-17-2021, 01:13 PM | #12 |
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Join Date: Jan 2015
Location: San Jose California
Posts: 150
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Re: Surface corrosion on crank
Try Amazon
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11-17-2021, 01:35 PM | #13 |
Senior Member
Join Date: May 2010
Posts: 2,594
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Re: Surface corrosion on crank
I had same problem finding crocus cloth ...
Try Emery Cloth ... Google finds many more hits than crocus cloth |
11-17-2021, 01:37 PM | #14 |
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Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,508
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Re: Surface corrosion on crank
Y'all use crocus cloth or emery paper if you like, but I personally would use cork only to deburr it and then leave the rest alone. Using any aggressive media on it will quickly egg-shape the journal pin and IMHO causing bigger issues than what the corrosion is.
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11-17-2021, 01:39 PM | #15 |
Junior Member
Join Date: Oct 2021
Posts: 9
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Re: Surface corrosion on crank
Take the above mention cloth, wrap it around the journals then use a wide shoe string and wrap it around the cloth twice and then pull the ends back and forth. Makes it easier to polish it.
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11-17-2021, 01:40 PM | #16 |
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Join Date: Oct 2021
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Re: Surface corrosion on crank
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11-17-2021, 03:28 PM | #17 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,899
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Re: Surface corrosion on crank
The crocus cloth is not aggressive enough to cause an egg shape journal. It just polishes. Of course it must be used over the entire 360 degrees of the journal in a uniform manor. I did one journal of a friends 1924 Buick that had a rod knock. I checked the journal with a mike afterwards and there was no out of round or difference lengthwise. I took some shims out of the rod bearing and the car was run like that until my friend recently passed away. I don't know who ended up with the car but it is probably still being run that way.
https://www.mcmaster.com/crocus-cloth/
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
11-17-2021, 03:39 PM | #18 | |
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Join Date: May 2010
Location: So Cal
Posts: 8,741
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Re: Surface corrosion on crank
Quote:
When I worked at a Porsche dealer that's how the master mechanic used to polish a crank except he used a piece of string. |
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11-17-2021, 03:55 PM | #19 |
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Join Date: Oct 2017
Posts: 563
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Surface corrosion
Why is it called "Crocus" cloth? Are there little crocuses embedded in the paper or something? How about "Emery" paper? Named after some guy in Michigan at the turn of the century?
(How many here know for example grease Zerks are actually named after the inventor, Oscar Ulysses Zerk? It's true.) Thus concludes today's installment of interesting, but probably useless information. |
11-17-2021, 04:20 PM | #20 | |
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Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,508
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Re: Surface corrosion on crank
Quote:
Hmmm, maybe not to a naked eye but I'd bet you'd retract that statement if you watched me measure it with an Arnold gage on my crankshaft grinder after someone polishes it with crocus paper. My target when grinding a Model-A crankshaft is 0.00025" (i.e.: ¼ thousandths) of concentricity. My machine (Storm Vulcan Model 15) will hit that number repeatedly, therefore I know from experience what emery paper will do. We do not use emery paper anywhere near a crankshaft pin. |
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