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Old 02-07-2016, 08:45 AM   #1
jrd-28
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Default Cotter pins

Hi all. Hardware question:

I opened up the bottom end of my '28 engine. It mostly looks pretty good in there, but some previous owner had the bottom end apart, and used 6-penny nails instead of cotter pins on the rods. Obviously, those need to get replaced

I see the parts lists calling for plain steel cotter pins. I have quite a few aircraft grade parts, in stainless. Is it ok to use what I have, or is there a reason to prefer plain steel over stainless for this application?

TIA . . .
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Old 02-07-2016, 09:00 AM   #2
Pilotdave
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Default Re: Cotter pins

I'd think that you'd be fine to use up your stock of stainless cotter pins.....unless you are concerned about the next owner doing what you just did and concluding that some previous owner was a profligate spender. Henry used plain steel because they were adequate and would have been cheaper - if stainless pins were available at all.
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Old 02-07-2016, 09:41 AM   #3
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Default Re: Cotter pins

He must have been a carpenter.
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Old 02-07-2016, 09:50 AM   #4
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Default Re: Cotter pins

You don't need cotter pins if the caps are tightened sufficiently.
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Old 02-07-2016, 09:59 AM   #5
Mike V. Florida
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Default Re: Cotter pins

Quote:
Originally Posted by jrd-28 View Post
Hi all. Hardware question:

I opened up the bottom end of my '28 engine. It mostly looks pretty good in there, but some previous owner had the bottom end apart, and used 6-penny nails instead of cotter pins on the rods. Obviously, those need to get replaced

I see the parts lists calling for plain steel cotter pins. I have quite a few aircraft grade parts, in stainless. Is it ok to use what I have, or is there a reason to prefer plain steel over stainless for this application?

TIA . . .
That's just because that's what was used originally, and think about it they don't have much change to rust in the bottom end of an engine. Use what you have.
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Old 02-07-2016, 10:04 AM   #6
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Default Re: Cotter pins

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Originally Posted by 1wonton View Post
You don't need cotter pins if the caps are tightened sufficiently.
Hmmm. I'll take your word for it, but I'm inclined to use them anyway. Call me paranoid
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Old 02-07-2016, 10:23 AM   #7
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Default Re: Cotter pins

Use stainless
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Old 02-07-2016, 12:36 PM   #8
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Default Re: Cotter pins

If the nails are doing there job, leave them in there. Like the old saying "If it ain't broke, don't fix it"
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Old 02-07-2016, 12:39 PM   #9
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Default Re: Cotter pins

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If the nails are doing there job, leave them in there. Like the old saying "If it ain't broke, don't fix it"
Or work on it till you break it :-)
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Old 02-07-2016, 12:50 PM   #10
BILL WILLIAMSON
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Default Re: Cotter pins

I've NEVER seen a NAIL fail, when used instead of a cotter key! Years back, they were used a lot, even on the brakes. Folks were POOR. We once lived in a house with a DIRT kitchen floor.
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