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Tightening Clutch bolts

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duncanpage
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PostPosted: 10:20 - 17 Jun 2007    Post subject: Tightening Clutch bolts Reply with quote

Hi
Can anyone tell me what would happen if I tightened the clutch bolts more than the Haynes manual said to or if I didn't tighten them enough?

I ask because my clutch seems to be making funny noises when I change gear, I've changed the clutch plates & springs & tightened the bolts up to the specified torque settings. I'm wondering if my torque wrench is broken or if my old engine needs the bolts slightly tighter than usual?

My bike is 1996 D3 Kawasaki GPZ500S. Any advice would be greatly appreciated.
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bugsy46
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PostPosted: 10:50 - 17 Jun 2007    Post subject: Reply with quote

If you were to do them too tight then there would be too much spring force, if too loose then not enough force. I would be checking that you have built the clutch up correctly
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duncanpage
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PostPosted: 10:55 - 17 Jun 2007    Post subject: Reply with quote

bugsy46 wrote:
I would be checking that you have built the clutch up correctly


How should I build it up correctly? I followed the instructions in the Haynes manual, but unlike the clutch I took out which had groves going in one direction, the Kevlar clutch I replaced it with didn't have groves going in one direction. I greased the plates with new oil before putting them in & replaced the springs with the ones that came with the plates.
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bugsy46
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PostPosted: 11:15 - 17 Jun 2007    Post subject: Reply with quote

I take it you mean the grooves on the cork plates? If so that has nothing to do with it. What kind of noise is it making?
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Pete.
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PostPosted: 11:19 - 17 Jun 2007    Post subject: Reply with quote

bugsy46 wrote:
If you were to do them too tight then there would be too much spring force, if too loose then not enough force. I would be checking that you have built the clutch up correctly


Sorry this is completely wrong. The clutch "spring force" (base pressure) is the same if you either nip the bolts up gently or crank them down tight, since the spring compressed-length is the same. Overtightening the bolts will just risk snapping them.

Checking that the clutch is assembled correctly is the right idea.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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duncanpage
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PostPosted: 11:23 - 17 Jun 2007    Post subject: Reply with quote

bugsy46 wrote:
I take it you mean the grooves on the cork plates? If so that has nothing to do with it. What kind of noise is it making?


Yes, those are the grooves I mean.
It makes a kind of wirring noise when riding the clutch (i.e. when taking of slow & smoothly when the wifes is on the back)

If I try to take off quickly with lots of revs it makes a chirping sound almost like a large parrot could (only thing I can describe it as) at first I thought it was the back wheel spinning but according to some friends who were walking past the back wheel didn't do anything, the noise definately came from the engine somewhere!

Needless to say I haven't tried it since!
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Pete.
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PostPosted: 11:25 - 17 Jun 2007    Post subject: Reply with quote

I shouldn't worry about those noises they will most likely go away as the clutch beds-in. Even if they don't I still wouldn't worry.
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bugsy46
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PostPosted: 11:34 - 17 Jun 2007    Post subject: Reply with quote

Ok, so if it doesnt make any difference then next time you change a clutch, nip up the spring so it isnt compressed and see how well your cluctch works. Its like trying to say preloading fork springs makes no difference to the suspension

that aside


how long did you soak your plates for? a few ive replaced when i havnt had time to soak them have produced a noisy clutch until the oil has worked its way into them. Dont worry about it its normal!
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Pete.
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PostPosted: 11:45 - 17 Jun 2007    Post subject: Reply with quote

bugsy46 wrote:
Ok, so if it doesnt make any difference then next time you change a clutch, nip up the spring so it isnt compressed and see how well your cluctch works. Its like trying to say preloading fork springs makes no difference to the suspension



There's a big difference between over-tightening a bolt and not running it down fully. Not running-down a bolt would indeed cause less preload on the spring but since the OP stated:

Quote:
I've changed the clutch plates & springs & tightened the bolts up to the specified torque settings.


This completely rules-out the fact that his bolts might not be fully run-down, and the spring not compressed.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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bugsy46
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PostPosted: 11:58 - 17 Jun 2007    Post subject: Reply with quote

Yes and this wasnt my diagnosis of the problem was it?

You will find I asked him to check his work

AND

I also asked him what kind of noise it made, which led to confirmation of dry plates chirping, which is a product of low soak time
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sickpup
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PostPosted: 12:12 - 17 Jun 2007    Post subject: Reply with quote

As Geri says as long as the bolt head is nipped to the shoulder of the clutch threaded boss the torque setting is pretty much irrelevant to the pre-loaded spring pressure.
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Pete.
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PostPosted: 13:25 - 17 Jun 2007    Post subject: Reply with quote

bugsy46 wrote:
Yes and this wasnt my diagnosis of the problem was it?

You will find I asked him to check his work

AND

I also asked him what kind of noise it made, which led to confirmation of dry plates chirping, which is a product of low soak time


Look, he asked this:

Quote:
I've changed the clutch plates & springs & tightened the bolts up to the specified torque settings. I'm wondering if my torque wrench is broken or if my old engine needs the bolts slightly tighter than usual?


And you replied with this:

Quote:
If you were to do them too tight then there would be too much spring force, if too loose then not enough force.


How else can your reply be read other than it's suggesting that you are saying that torquing the bolts differently will affect the base-pressure.

Now when I pointed out that you were wrong you then tried to use semantics to argue my own post:

Quote:
Ok, so if it doesnt make any difference then next time you change a clutch, nip up the spring so it isnt compressed and see how well your cluctch works.


It's generally accepted that "nipping up" a nut or bolt means running it down to it's extent then using a small force to "nip" it down - not leaving it half-undone as you seem to think.

Basically your original reply was misleading and would leave the guy thinking that bolt torque affected the spring base pressure.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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bugsy46
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PostPosted: 16:08 - 17 Jun 2007    Post subject: Reply with quote

And even worse, your reply would mislead the guy into thinking a chirping clutch is ok! Now if somebody came into our workshop with the same problem and I told them ahhh if it doesnt go away its fine then that would be fucking them off I guess! Im sorry for misleading you duncan as I misread your post a little! At least now you have a theoretical reason for why the noise is there!
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Laura - "And where did looks come into this and bugsy leave steven alone. You are not gods gift to women you may think you are but you're not."
Keith - "All the best"
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Pete.
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PostPosted: 16:31 - 17 Jun 2007    Post subject: Reply with quote

It's not easy to diagnose "strange noises" over the internet. If it were brought into your workshop then you'd have the benefit of hearing the noise for yourself and could decide on the proper course of action. You said yourself that a noisy new clutch can be "normal". I did say that it was a good idea to check for proper assembly.

The other big difference between giving technical advice in person and over the internet is that on here it's not only the person asking the question that reads the answer, that's why it's so important for mistakes/ambiguous replies to be pointed-out. If your original reply was left unchallenged then it's possible that another person could be dashing off into the shed armed with a socket-set thinking they could cure their slipping clutch by clamping-down harder on the spring-bolts, possibly shearing bolts and certainly not fixing their clutch.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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bugsy46
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PostPosted: 17:06 - 17 Jun 2007    Post subject: Reply with quote

Then that would be their fault by not adhering to torque settings! I never said "go and tighten up your bolts!!" ????
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Laura - "And where did looks come into this and bugsy leave steven alone. You are not gods gift to women you may think you are but you're not."
Keith - "All the best"
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Pete.
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PostPosted: 14:36 - 18 Jun 2007    Post subject: Reply with quote

Not difficult to imagine how you got your custom title really is it....
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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