Torque figure

not-ron · Oct 8, 2007

I am just reassembling my clutch on my mk111 and checking the manual the torque figure for the centre it is quoted as 70 ft lbs something has come to mind that i've read in these pages of wisdom that this is not correct....could someone enlighten me if this is correct and if not what the correct figure is.......

geo46er · Oct 8, 2007

clutch center torque

Hi,
I have read that torquing to the full 70 ft lbs can actually shear the locating circlip. The clutch center is not a taper fit like a Triumph clutch nor does it offer any sideways thrust support. It actually only needs to be tight enough not to come loose. I have read that 40 or 50 ftlbs would be more acceptable, but, with thread locking agent and/or the bent tab lock washer you could probably get away with less. There are many Japanese bikes that simply use an "e"clip to locate the clutch center and it is not tight on the shaft at all.
GB

james · Oct 8, 2007

Both Mick Hemming and Les Emery have strongly warned about the 70 ft/lb figure given in the manual(s), no more than 40 ft/lbs. should be used or we risk shearing the circlip.Mine has remained tight at 40 ft/lbs after fitting 4 years and 7,000 miles ago. Good luck. James.

johnny 750 · Oct 8, 2007

you guys wouldnt happen to know about atlas clutches would you? i run an atlas clutch in my commando, i'm reassembling mine (single chain instead of triple) and i just torqued it to a little less than 70, going off of a commando manual...

not-ron · Oct 9, 2007

this is what I thought so i'm going with just over 40 ft lbs also noticed in the manual it states to use both the locking tabs

Thanks for the advice

79x100 · Oct 9, 2007

I've always gone by the book - 70lbs/ft and I've never had a problem. I do usually replace the circlip if I have to remove it.

If the grooves and retainer are in good condition then I don't think that automatic failure follows torquing to 70.

not-ron · Oct 9, 2007

Just checked out Norvil's web site www.norvilmotorcycle.co.uk/
under tech talk and they state Dominator = 70Lb/Ft Commando = 40Lb/Ft
reason given,quote: Commando is less because the circlip behind the clutch shears at 55Lb/Ft - you have been warned !: unquote so me thinks 40 ft lbs will do for me...

79x100 · Oct 9, 2007

I think that Les Emery does have a tendency to...How should I put this ?...erm state his opinion as if it were fact.

40 lbs/ft is probably adequate but I can assure you that the the circlip doesn't function like a click-stop torque wrench at 55 lbs/ft.

Before L.A.B. asks, no, my torque wrenches haven't been calibrated for donkey's years but they're not too far out !

L.A.B. · Oct 9, 2007

79x100 said:
I think that Les Emery does have a tendency to...How should I put this ?...erm state his opinion as if it were fact.

40 lbs/ft is probably adequate but I can assure you that the the circlip doesn't function like a click-stop torque wrench at 55 lbs/ft.

But I believe I've read (here?) before that others have suffered circlip failure?

79x100 said:
Before L.A.B. asks, no, my torque wrenches haven't been calibrated for donkey's years but they're not too far out !

As if I would!!

But you do slacken them off fully after using them....don't you?

79x100 · Oct 9, 2007

I'm not trying to convince anyone else to risk failure ! I suppose I shall suffer from a dilemma the next time that mine's apart :roll:

Les, you'll be pleased to hear that both the Superslim and the Norbar are relaxing happily in their drawer :wink:

not-ron · Oct 11, 2007

79x100 I hope that in no way do you suffer any sort of dilema,confidence in what you do is everything. Its always difficult to go against a factory manual but as sometimes mistakes were made in the construction of these fine machines it can be assumed that the scribe who penned the words could also have erred no less even the printer's !!!!!!I glad someone mentioned the slackening of tension in the torque wrench, I'm just of down the workshop to check mine... :roll:

79x100 · Oct 11, 2007

I think that after 25 years of pulling them up to 70 lbs without problems I'll probably carry on. If a circlip fails then at least I'll know why !

Maybe the circlips I buy are higher tensile than the ones Norvil sell ? :shock: Whoops - shouldn't say that, should I ? :roll:

Torque figure

not-ron

geo46er

james

johnny 750

not-ron

79x100

not-ron

79x100

L.A.B.

Moderator

79x100

not-ron

79x100

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