Cotter pins
 

Just wondering what people are using for cotter pins inside the engine. I have another car in the shop for connecting rod failure, do to failed cotter pins.
Everything I can find is made in China.

Re: Cotter pins
 

There are several "Made in USA" cotter pin suppliers - use Google.

Re: Cotter pins
 

Orig castellated nuts only use about 4 full threads. Get some ARP 300-8333 nuts and forget the cotter pins.

Re: Cotter pins
 

Aircraft supply companies should have stainless steel cotter pins .

Re: Cotter pins
 

Only use genuine Nettlefolds cotter pins for Ford cars:

https://www.fordbarn.com/forum/attac...1&d=1778892785

Brad in Maryland

PS: Good luck finding them however.....:rolleyes:



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Re: Cotter pins
 

The stainless pins that Big Hammer introduced are also available at McMasters-Carr. Those pins are twice as hard as the usual steel pins.

Re: Cotter pins
 

Cotters are available at Bolt Depot also. https://boltdepot.com/Cotter_pins

Re: Cotter pins
 

Even where I would use cotter pins, I use blue LockTight as insurance.

Re: Cotter pins
 

Why do cotter pins fail?

Re: Cotter pins
 

Fordfixer, hard to imagine a cotter pin failing if properly sized and properly installed. Before we all start dropping our oil pans to investigate, can you relate the failure and ensuing issue you experienced. Thanks.

Re: Cotter pins
 

Oh, dont talk to me about broken cotter pins. I found this on the bottom of my oil pan one day.

Re: Cotter pins
 

A few things I can think of are: inferior metallurgy resulting in premature metal fatigue, incorrect size pin required for application, improper installation, loosening of nut causing a shearing effect on the pin, installing a used pin, and centrifugal force acting against all of the above. There are probably other factors also.

Re: Cotter pins
 

This is a cotter pin!
https://en.wikipedia.org/wiki/Cotter_(pin)

Re: Cotter pins
 

Old 31, Those are not cotter pins (as Synchro would say, split pins) but pieces of round wire. They look like pieces of safety wire. They look like they were twisted together at some point.

Re: Cotter pins
 

NK, you are 100% correct. I never picked up on that; I just assumed that they were cotter pins.

OK, where in the hell did twisted wire come from? Geeeez.

Re: Cotter pins
 

The Wretched Roadster had the bottom few turns of the broken-off oil pump spring sitting in the bottom of the pan. Amazing how these engines will tolerate certain types of degradation without stopping.

Re: Cotter pins
 

If only we knew the secrets these Ol' Girls hold...

Re: Cotter pins
 

Well ya know...back on the farm when we didn't have cotter pins we used baling wire. That picture sure looks like it may be just that. On a rod nut it's less than ideal though!

Re: Cotter pins
 

100% original Model T's were found to have nails used instead of cotter pins in various places. There was a lot of pressure in the early days to get the cars out so an assembler would grab whatever worked.

Re: Cotter pins
 

The GKN advert the " Birmingham" is big English city not the one in AL .In UK cotter pin is also known as "split pin" .

John in rain showers Suffolk County England