Author Topic: 6/1 bigend bearing locknut  (Read 7674 times)

solarphil

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6/1 bigend bearing locknut
« on: January 29, 2012, 06:00:21 AM »
Hi All

I have a 6/1 nearing restoration completion - CS43501

New camshaft (Indian) etc

I've been looking at the bigend bearing and have found that it had excessive clearence.  I've got the clearence down to where it should be but now the hole in the castellated nut doesn't match whre the split pin needs to be for the torque required on the nut.  What does one do - re-drill a new hole, back off the nut until the next hole "becomes available"

I'd like to know what I should do - what would you do  ???

Regards

Phil


solarphil

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Re: 6/1 bigend bearing locknut
« Reply #1 on: January 29, 2012, 07:51:36 AM »
I see that Real Diesels has a big end bearing nut without castellations

http://www.realdiesels.co.uk/listerparts2.html

Is this what I should be going for or will the current castellated nuts be OK without split pins?


lendusaquid

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Re: 6/1 bigend bearing locknut
« Reply #2 on: January 29, 2012, 10:19:37 AM »
That is what i replaced mine with. They do make things a lot easier.

millman56

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Re: 6/1 bigend bearing locknut
« Reply #3 on: January 29, 2012, 02:35:30 PM »
You could try lightly filling the face of the nut until a slot lines up.

Mark.

millman56

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Re: 6/1 bigend bearing locknut
« Reply #4 on: January 29, 2012, 02:41:00 PM »
Should read filing not filling.

BruceM

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Re: 6/1 bigend bearing locknut
« Reply #5 on: January 29, 2012, 04:14:15 PM »
Washer shims are normally used to solve the alignment issue.
Permatex thread locker is also a common "cheat".

Stan

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Re: 6/1 bigend bearing locknut
« Reply #6 on: January 29, 2012, 06:29:27 PM »
Shims.
Stan

neseng

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Re: 6/1 bigend bearing locknut
« Reply #7 on: January 30, 2012, 09:55:35 AM »

         .......Just strip the thread and then back it off half a turn! ......thats how we used to do it when I worked in the air force! ......

solarphil

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Re: 6/1 bigend bearing locknut
« Reply #8 on: January 30, 2012, 09:55:53 PM »
Thanks guys for the mostly...ha ha  helful ideas

One question though, how is it that the steel nuts without castellations dont work loose?

Are they made to bind or something like that?

neseng

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Re: 6/1 bigend bearing locknut
« Reply #9 on: January 31, 2012, 02:42:16 AM »
.....Have a look at the following info, ....courtesy of:    http://praticalmaintenance.wordpress.com/   

..........(I thought I had better redeem myself after my previous offer of a solution to the problem!..........

All-metal Lock Nuts

As nylock nuts are not suitable in areas exceeding 120 degrees C, for high temperature application all-metal lock nuts are used. Various types of all-metal lock nuts are as under.

Distorted Thread Nut (CLEVELOC Nut)

In this type of nut, the collar of the nut has been slightly crushed at the top to make it oval. When the round bolt reaches the oval portion of the nut it springs the nut back round. This spring action grips the bolt and adds friction that prevents loosening. Such type of nut is also known as Cleveloc nut. Cleveloc is a registered trade name of Forest Fasteners.

Hope that was more helpful,

Cheers,  neseng.

Stan

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Re: 6/1 bigend bearing locknut
« Reply #10 on: January 31, 2012, 02:57:52 AM »
"One question though, how is it that the steel nuts without castellations dont work loose?

Are they made to bind or something like that?

Loctite?
Stan

neseng

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Re: 6/1 bigend bearing locknut
« Reply #11 on: January 31, 2012, 04:43:39 AM »
......Ah ha! .....glad you asked, ....just read on!

A castellated locknut having an annular ring and a set of castellations, wherein the castellations are tapered to provide a locking mechanism. The locknut is provided with a circumferential groove formed between the castellations and the annular body which ensures that the castellations have equal base cross-sectional areas, such that the castellations deflect uniformly upon mounting to a shaft. Further, the provision of the circumferential groove renders the annular ring torsionally flexible as compared to the flexural stiffness of the castellations. Upon mounting to a shaft, the annular ring of the locknut elastically and torsionally deflects, thus allowing the castellations to pivot clear of the shaft without undesirable inelastic deformation. Accordingly, a precise and uniform locknut having an effective locking mechanism is achieved. In an alternative embodiment, the castellations are not tapered; rather the castellations are bent radially by the application of a load prior to mounting to a shaft such that, upon mounting to the shaft, a locking interference is achieved.

.....Now try telling that to your missus with a mouth full of toast at the breakfast table next Sunday morning! .....

neseng.

listeroil

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Re: 6/1 bigend bearing locknut
« Reply #12 on: January 31, 2012, 11:54:18 PM »
Solarphil

Tighten to 55 lb/ft and then tighten a little bit further untill the split pin holes line up.

Regards Mick
« Last Edit: February 01, 2012, 12:01:21 AM by listeroil »

solarphil

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Re: 6/1 bigend bearing locknut
« Reply #13 on: February 06, 2012, 12:25:56 AM »
Thanks guys for all the input

I understand a lot more about fixing down bigend studs now

What a great idea forums are!!

Phil