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Clutch nut size? #775296
05/31/19 11:10 pm
05/31/19 11:10 pm
Joined: Oct 2017
Posts: 220
MA
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Nick H Offline OP
BritBike Forum member
Nick H  Offline OP
BritBike Forum member
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Joined: Oct 2017
Posts: 220
MA
Working on a Lightning and I have 2 motors. Ordered part number 68-3300, clutch nut from an eBay seller that sells lots of British bike parts.
It doesn't fit either of my transmission main shafts. Seems to small.
Ordered another, same part from a Britbike forum sponsor, it is identical and doesn't fit.
Every reference says this should be 9/16" 20 tpi
(except the Greg Marsh fastener database which says 68-3300 is 13/16" 20 tpi)
Should I look for a 13/16" 20 tpi nut? Can't be that large.
I'm tempted to buy a 5/8" 20 tpi from British Tool and Fastener to see if it fits.
Anyone know what might be going on.

Last edited by Nick H; 05/31/19 11:13 pm.

1966 BSA Lightning
1967 Triumph "Choppa"
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Re: Clutch nut size? [Re: Nick H] #775333
06/01/19 6:21 am
06/01/19 6:21 am
Joined: May 2013
Posts: 5,469
West Yorkshire
Allan Gill Online happy

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Allan Gill  Online Happy

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Joined: May 2013
Posts: 5,469
West Yorkshire
I bought a couple and found the same problem, just wouldn’t start on the threads. It needed a tap running though (but not far enough through to thread onto the aero fit part ) also I had to put it in the large to create a leading edge like the originals as even after the tap had gone through it still wouldn’t start.


beerchug
Re: Clutch nut size? [Re: Allan Gill] #775361
06/01/19 1:28 pm
06/01/19 1:28 pm
Joined: Oct 2017
Posts: 220
MA
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Nick H Offline OP
BritBike Forum member
Nick H  Offline OP
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Joined: Oct 2017
Posts: 220
MA
Originally Posted by Allan Gill
I bought a couple and found the same problem, just wouldn’t start on the threads. It needed a tap running though (but not far enough through to thread onto the aero fit part ) also I had to put it in the large to create a leading edge like the originals as even after the tap had gone through it still wouldn’t start.


This suggests these parts are defective, no?
I'll have to invest in a tap.
No lathe so maybe a reamer to create a leading edge.

Or better, find a used part.

Last edited by Nick H; 06/01/19 2:36 pm.

1966 BSA Lightning
1967 Triumph "Choppa"
Re: Clutch nut size? [Re: Nick H] #775427
06/02/19 8:44 am
06/02/19 8:44 am
Joined: May 2013
Posts: 5,469
West Yorkshire
Allan Gill Online happy

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Allan Gill  Online Happy

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Joined: May 2013
Posts: 5,469
West Yorkshire
Agreed Nick, poorly made indeed even if they are using the right materials. I’d refrain from using a used one, only reason I changed mine was it wouldn’t hold torque anymore, soon as I opened the throttle hard the nut would unwind off its thread, although locktite might help but I try to refrain from using it in such application.


beerchug
Re: Clutch nut size? [Re: Nick H] #775432
06/02/19 11:03 am
06/02/19 11:03 am
Joined: Aug 2001
Posts: 4,502
argyll. scotland, uk
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
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Joined: Aug 2001
Posts: 4,502
argyll. scotland, uk
I use blue nut lock on the clutch nut, never had any bother with it.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Clutch nut size? [Re: Nick H] #775436
06/02/19 12:28 pm
06/02/19 12:28 pm
Joined: Aug 2001
Posts: 7,726
scotland
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 7,726
scotland
I would always Loctite a clutch centre nut.


Amateur Loctite enthusiast.
Re: Clutch nut size? [Re: Nick H] #775469
06/02/19 9:10 pm
06/02/19 9:10 pm
Joined: Dec 2013
Posts: 4,526
ohio, usa
kevin roberts Offline

DOPE
kevin roberts  Offline

DOPE

Joined: Dec 2013
Posts: 4,526
ohio, usa
i also.

the nut on the other end too


every day you do not take a chance is a day of your life that you will never get back.
Re: Clutch nut size? [Re: Nick H] #775515
06/03/19 10:42 am
06/03/19 10:42 am
Joined: May 2004
Posts: 4,020
Sydney Australia
B
BSA_WM20 Online content
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BSA_WM20  Online Content
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B

Joined: May 2004
Posts: 4,020
Sydney Australia
Blue for this little black duck as well


Bike Beesa
Trevor
Re: Clutch nut size? [Re: Nick H] #775521
06/03/19 12:40 pm
06/03/19 12:40 pm
Joined: May 2013
Posts: 5,469
West Yorkshire
Allan Gill Online happy

BritBike Forum member
Allan Gill  Online Happy

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Joined: May 2013
Posts: 5,469
West Yorkshire
interesting! I'always refrained from it as (on the A65) its a self locking nut, I did fit some locktite on a setscrew that was using a stover nut (looks like its been centre punched on 3 sides)

example of stover nut

Couldn't remove it again afterwards and had to drill the setscrew out. On mudguards I use locktite regardless of the nut type.


beerchug
Re: Clutch nut size? [Re: Nick H] #775563
06/03/19 10:13 pm
06/03/19 10:13 pm
Joined: Jan 2014
Posts: 138
Oceania
N
NickL Offline
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NickL  Offline
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Joined: Jan 2014
Posts: 138
Oceania
Nothing worse than your nuts falling off eh?

I'd get on to the bloke who sold those nuts to you and tell him you want the mainshafts that go with them for free.
Sod messing about with taps unless he's paying for them.

A drop of blue loctite never hurts on the clutch centre nut and the crank one too.

Re: Clutch nut size? [Re: Nick H] #775567
06/03/19 11:14 pm
06/03/19 11:14 pm
Joined: Oct 2006
Posts: 3,038
Elburn, Ill. USA
I
Irish Swede Offline
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Irish Swede  Offline
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Joined: Oct 2006
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Elburn, Ill. USA
WHO is that eBay seller? What eBay alias does he go by?

They all use aliases anyway, so his personal name won't be mentioned.

Everyone on this site needs to know so we can stay away from dealing with him.
WAAAYYY too much of this goes on with eBay sellers.

Re: Clutch nut size? [Re: Nick H] #775569
06/03/19 11:19 pm
06/03/19 11:19 pm
Joined: Oct 2017
Posts: 220
MA
N
Nick H Offline OP
BritBike Forum member
Nick H  Offline OP
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Joined: Oct 2017
Posts: 220
MA
The eBay seller is "smmotorco" but I also bought one from site sponsor CBS. They claim to have used the nut on Triumphs with no issues and offered a refund if I returned it.

I wonder if Allan recalls where he purchased his.

Last edited by Nick H; 06/03/19 11:21 pm.

1966 BSA Lightning
1967 Triumph "Choppa"
Re: Clutch nut size? [Re: Nick H] #775599
06/04/19 6:32 am
06/04/19 6:32 am
Joined: May 2013
Posts: 5,469
West Yorkshire
Allan Gill Online happy

BritBike Forum member
Allan Gill  Online Happy

BritBike Forum member

Joined: May 2013
Posts: 5,469
West Yorkshire
Just checked, April last year I got 2x from Draganfly. Having this problem since I’ve been in to Britbike’s I often don’t have the time to pee about sending stuff back and often just sort the problem my self as it’s much quicker. Draganfly have a lot of NOS parts and an easy to use site so I often buy from them.

As for the locktite, I wonder what the actual torque applied is when you add locktite to the threads as it suddenly becomes a lot higher than 60ft/lb.


beerchug

Moderated by  Allan Gill, Jon W. Whitley 

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