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Jun 14th, 2026
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Joined: Nov 2013
Posts: 786 Likes: 18
Talk Morgan Regular
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Talk Morgan Regular
Joined: Nov 2013
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I forgot to say that I made myself a thicker nut that comes just at the end of the crankshaft thread because the original one seems weak to me.
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Joined: Jun 2012
Posts: 2,242 Likes: 72
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
Posts: 2,242 Likes: 72 |
I know what you mean Chris (and Laurens) but locking the nut via the star washer to a moveable plain washer doesn't seem to be locking at all to me. I do like the idea of the dose of Loctite 660, at least until it needs to be taken apart...but if it all works as it should that hopefully won't be your problem.
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Joined: Oct 2016
Posts: 132 Likes: 1
L - Learner Plates On
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L - Learner Plates On
Joined: Oct 2016
Posts: 132 Likes: 1 |
I would say that what stops the hub from rotating on the splines even minutely is the friction between the end of the hub and the crank bearing journal
That is created by the nut being tightened to the correct torque of course
it seems to me that the plain washer is critical in transmitting that force through from the nut to the hub end as it is a bigger diameter and much thicker than the locking washer alone.
PaulR
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Joined: Sep 2012
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Sep 2012
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I know PB doesn't like threadlock etc,
I've just re-watched Phil's video and although he doesn't show it he does say that for his final assembly of the splined flange onto the crankshaft he used Loctite and a washer. Quite correct Chris. Phil does use it. I'll shut up 
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Joined: Jul 2013
Posts: 3,732 Likes: 79
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,732 Likes: 79 |
I know PB doesn't like threadlock etc,
I've just re-watched Phil's video and although he doesn't show it he does say that for his final assembly of the splined flange onto the crankshaft he used Loctite and a washer. Quite correct Chris. Phil does use it. I'll shut up Please don't shut up Peter, the more ideas and input the better 
Red Leader 
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Joined: Jul 2013
Posts: 3,732 Likes: 79
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,732 Likes: 79 |
I would say that what stops the hub from rotating on the splines even minutely is the friction between the end of the hub and the crank bearing journal
That is created by the nut being tightened to the correct torque of course
it seems to me that the plain washer is critical in transmitting that force through from the nut to the hub end as it is a bigger diameter and much thicker than the locking washer alone.
To me that makes sense. Is there room for a larger diameter flat washer to spread the load even more? Also would it make sense to use two half nuts rather than one full size so one acts as a locknut?
Red Leader
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Joined: Sep 2016
Posts: 1,033 Likes: 33
Has a lot to Say!
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Has a lot to Say!
Joined: Sep 2016
Posts: 1,033 Likes: 33 |
I would say that what stops the hub from rotating on the splines even minutely is the friction between the end of the hub and the crank bearing journal
That is created by the nut being tightened to the correct torque of course
it seems to me that the plain washer is critical in transmitting that force through from the nut to the hub end as it is a bigger diameter and much thicker than the locking washer alone.
If that were the case you wouldn't need splines. A secured splined coupling that is required to transmit loads in both directions is not ideal. A tapered or keyed coupling should have been used. If it were the tension created by the nut that prevented rotational movement a spline wouldn't be necessary and a plain shaft with the coupling loosely slipped over would suffice. Clearly this wouldn't work. It's likely that however tight the nut is there will be relative movement of the coupling on the splines. The only practical solution is to lock the nut in place. There are numerous means of doing this and proprietary locking devices available.
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Joined: May 2012
Posts: 1,796 Likes: 5
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2012
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Would it be possible to use tab washer?
Don't know-just a thought
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Joined: Oct 2016
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L - Learner Plates On
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L - Learner Plates On
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^It's likely that however tight the nut is there will be relative movement of the coupling on the splines^
I wonder why then the nut hasnt come loose on the majority of cars?
PaulR
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Joined: Mar 2013
Posts: 718 Likes: 11
Talk Morgan Regular
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OP
Talk Morgan Regular
Joined: Mar 2013
Posts: 718 Likes: 11 |
^It's likely that however tight the nut is there will be relative movement of the coupling on the splines^
I wonder why then the nut hasnt come loose on the majority of cars? Original rubber rollers, flat washer, star washer and half a nut ?
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