Author Topic: B**tard castellated clutch nut....  (Read 1679 times)

Offline Matt_Harrington

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B**tard castellated clutch nut....
« on: May 31, 2023, 06:27:52 PM »
I've not had one like this before and I bet the PO did something to it! (The clutch cover was literally glued on with some solid stuff either side of a gasket!) I have used heat, penetrating oil, air impact driver and even a 2ft breaker bar and it won't budge. (and yes, I've managed to 'spoil' the clutch backplate!) Before I attempt to drill the nut to then break it any other trick I can try?
Matt
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CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline andy120t

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Re: B**tard castellated clutch nut....
« Reply #1 on: May 31, 2023, 06:39:35 PM »
Are you turning it the right way ?!☺☺
andy120t

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Triumph 5TA - and this..

Offline Matt_Harrington

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Re: B**tard castellated clutch nut....
« Reply #2 on: May 31, 2023, 06:41:19 PM »
Isn't it a standard thread? ie undo anti-clockwise?
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline andy120t

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Re: B**tard castellated clutch nut....
« Reply #3 on: May 31, 2023, 07:00:14 PM »
..sorry, ignore me.. I was trying (failing) to be funny...
andy120t

CB550f/k
Zephyr 550
ZX6R G1
GSXR 7/11 - I need to sell it
Triumph 5TA - and this..

Offline Matt_Harrington

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Re: B**tard castellated clutch nut....
« Reply #4 on: May 31, 2023, 07:03:02 PM »
Andy, under normal circumstances I would have found that funny but it has been a mare of an afternoon with this engine!  ;)
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline andy120t

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Re: B**tard castellated clutch nut....
« Reply #5 on: May 31, 2023, 07:09:34 PM »
 :)hi
andy120t

CB550f/k
Zephyr 550
ZX6R G1
GSXR 7/11 - I need to sell it
Triumph 5TA - and this..

Offline Oddjob

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Re: B**tard castellated clutch nut....
« Reply #6 on: May 31, 2023, 07:45:18 PM »
You have removed the tang on the locknut washer. It's bent over so the nut can't come loose
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Accidents in the back seat cause kids.

Offline Laverda Dave

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Re: B**tard castellated clutch nut....
« Reply #7 on: May 31, 2023, 10:05:11 PM »
The only thing I can suggest is to use an induction heater on the nut itself. The localised heat applied just to the nut by the heating coil may be enough to break the seal on the thread between the nut and the shaft. A mate used one on the nut of a Muirhill tractor after trying everything else and the but just came undone!
Problem will be finding someone who has one as they are mega expensive to buy. Maybe try a local garage/mechanic. I'll ask my mate where he got his from, he lives in Buckinghamshire though so a long way from you.
I really wouldn't want to try and drill it off considering where it is and the shaft it is attached to.
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Offline Matt_Harrington

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Re: B**tard castellated clutch nut....
« Reply #8 on: May 31, 2023, 11:22:23 PM »
You have removed the tang on the locknut washer. It's bent over so the nut can't come loose

Yes, that has been done.
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline Matt_Harrington

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Re: B**tard castellated clutch nut....
« Reply #9 on: May 31, 2023, 11:38:17 PM »
The only thing I can suggest is to use an induction heater on the nut itself. The localised heat applied just to the nut by the heating coil may be enough to break the seal on the thread between the nut and the shaft. A mate used one on the nut of a Muirhill tractor after trying everything else and the but just came undone!
Problem will be finding someone who has one as they are mega expensive to buy. Maybe try a local garage/mechanic. I'll ask my mate where he got his from, he lives in Buckinghamshire though so a long way from you.
I really wouldn't want to try and drill it off considering where it is and the shaft it is attached to.

Interesting idea. I'll ask someone locally. I was planning on drilling into the nut itself to weaken it which I may still do ...
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline davidcumbria

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Re: B**tard castellated clutch nut....
« Reply #10 on: June 01, 2023, 08:31:11 AM »
When you say you tried heat was it enough. I have bought one of those  mapp torches and it’s incredible how much better it is than butane and heat guns. Same idea as the induction - just get it really hot and then use an impact driver.
500/4 in 79. No bikes for 30 years. 750/4 in 2013, 550/4 in 2023. Also own  R1100GS, RD350LC YPVS , Yamaha fazer 600, Yamaha XT250, BmwR80 , HondaVT1300, Royal Alloy GT125.

Offline Matt_Harrington

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Re: B**tard castellated clutch nut....
« Reply #11 on: June 01, 2023, 09:12:22 AM »
I stopped applying head when things started to smoke a little more than I would like!  :o
I have a couple of things to try today......
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline McCabe-Thiele (Ted)

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Re: B**tard castellated clutch nut....
« Reply #12 on: June 01, 2023, 09:36:19 AM »
Best of luck with the nut issue we've all had similar trials.
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Oddjob

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Re: B**tard castellated clutch nut....
« Reply #13 on: June 01, 2023, 10:15:23 AM »
Matt what seems to be the main problem, the nuts bonded onto the shaft or that the shaft is spinning so making your efforts to remove it harder?
Kids in a the back seat cause accidents.
Accidents in the back seat cause kids.

Offline Matt_Harrington

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Re: B**tard castellated clutch nut....
« Reply #14 on: June 01, 2023, 10:35:51 AM »
The nut is well and truly bonded. I've put the chain back on and tried to stop the main shaft turning but I still can't shift the nut. I must admit that trying to stop the main shaft turning is not 100% successful.....
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

 

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