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Clutch Housing nut reverse threaded?
Posted: Wed Sep 26, 2012 11:44 pm
by JimF
Is the nut holding the clutch housing a reverse thread?
in_the_cases3.jpg
I am getting ready to remove it so as to implement the kick-start repair....
(Yes, I see that I forgot to get the last clutch plate off.)
Thanks!
Jim
Re: Clutch Housing nut reverse threaded?
Posted: Wed Sep 26, 2012 11:48 pm
by Jordan
No, the only LH threaded nuts are the ones for the bevel gears on the camshaft and crankshaft.
Jordan
Re: Clutch Housing nut reverse threaded?
Posted: Thu Sep 27, 2012 12:09 am
by JimF
Thanks Jordan.
Is there a torque value for this nut when I go to put it back on?
Jim
Re: Clutch Housing nut reverse threaded?
Posted: Thu Sep 27, 2012 1:50 am
by Jordan
Not that I know of.
Jordan
Re: Clutch Housing nut reverse threaded?
Posted: Sat Sep 29, 2012 8:14 am
by Ventodue
"Tighten" is what the manual says, ... Jim

. {But around 160ft/lb (215Nm) is about right for a 16mm nut.}
EDIT: Ignore this. I can't believe it's right, even tho' this value comes from the table contained in the ISO 898-1 - see message below.)Just make sure you Loctite it (in which case, you can think about reducing the torque value by 10% or so). Even with the tab washer, the nuts can come loose. DAMHIK, but ...

Tony Brancato used to (still does?) make a modified tab washer. Not sure if it really makes a difference ...

Ciao
Craig
Re: Clutch Housing nut reverse threaded?
Posted: Sat Sep 29, 2012 11:11 am
by Eldert
the problem of the nut that holds the clutch centre in place coming lose is a common one .
the problem is on the inside on the inputshaft . there is a 2 mm spacer between the bearing and the shaft .
there is a nice radius on the shaft where it goes from the thicker part of the shaft to 20 mm .
the 2 mm spacer is square ( no radius ) so the spacer is not all the way home but rests on the radius
in due time the spacer gets a little bit of slack and that al the nut needs to work itself lose
when i put a engine together i make a radius on the 2 mm spacer so the spacer rest on the thicker part of the shaft
Eldert
Re: Clutch Housing nut reverse threaded?
Posted: Sat Sep 29, 2012 12:45 pm
by Ventodue
Eldert wrote:the problem of the nut that holds the clutch centre in place coming lose is a common one .
the problem is on the inside on the inputshaft . there is a 2 mm spacer between the bearing and the shaft .
there is a nice radius on the shaft where it goes from the thicker part of the shaft to 20 mm .
the 2 mm spacer is square ( no radius ) so the spacer is not all the way home but rests on the radius
in due time the spacer gets a little bit of slack and that al the nut needs to work itself lose
when i put a engine together i make a radius on the 2 mm spacer so the spacer rest on the thicker part of the shaft
Thanks Eldert - always good to have an explanation. It's this one, yes?

Ciao
Craig
Re: Clutch Housing nut reverse threaded?
Posted: Sat Sep 29, 2012 1:48 pm
by Single duck
Yep, got them online - though there's problems with the pics on the site at the moment. . Engine parts > Clutch and gearbox.
Re: Clutch Housing nut reverse threaded?
Posted: Sat Sep 29, 2012 2:47 pm
by Eldert
Hi Craig
Yep , that the one
Eldert
Re: Clutch Housing nut reverse threaded?
Posted: Sat Sep 29, 2012 3:22 pm
by Ventodue
Thanks Eldert.
Ciao
Craig