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Clutch operation

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Clutch operation

Post  JohnB on Mon Aug 04, 2014 9:27 pm

Hi Guys, Could anyone please advise how to test the clutch on my 1966 V15T. The engine is out of the bike and on the work bench. The clutch lever doesn't appear to do anything. plenty of movement at the pivot pin but I can't figure out how it operates the clutch ( if that makes sense) It stops at the clutch operator roller and that's it. Excuse my ignorance.

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clutch operation ?

Post  piston 197 on Tue Aug 05, 2014 5:45 am

There should be a rod running through the gearbox main shaft, the clutch arm presses one end and the other actuates on the centre of the clutch dome ?? when the clutch s actuated the pressure exerted by the rod separates the clutch plates disengaging drive.
JH
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Clutch operation

Post  JohnB on Tue Aug 05, 2014 8:33 am

Many Thanks. The clutch lever just taps against the clutch roller. there's no give whatsoever.

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Clutch operation

Post  JohnB on Wed Aug 06, 2014 9:10 pm

Hi JH. On further investigation it appears that the long rod when being pushed by the clutch lever and clutch roller hardly reaches the dome. fyi, the clutch screws are tightened to specification. I am at a loss to what is the problem. Can you get wear on either the roller or rod that shortens the specified length?
Thanks

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short rod

Post  piston 197 on Thu Aug 07, 2014 5:36 am

I personally on all of my bikes cut the rod into 2 parts and insert a ball bearing between the 2 halves, this is not to lengthen the rod, but to prevent it spinning against either end and wearing, it does have the effect of lengthening the rod and in your case may be the fix you are looking for ?
JH
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clutch operation

Post  MoscowFlyer on Thu Aug 07, 2014 6:20 am

In the riders handbook, it has the pushrod length at 8 1/2. Mike"
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Clutch operation

Post  JohnB on Thu Aug 07, 2014 7:56 am

Thanks Guys, Rod measures at 8 1/2''. Decided to strip clutch down are both nuts (clutch & sprocket) R.H. thread?. Is there anything I should look for that may be the cause of the problem and before I opt for the kwik fix solution.

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clutch

Post  piston 197 on Thu Aug 07, 2014 8:14 am

Yes clutch and engine sprocket nuts are conventional thread ,the one on the other side of the engine that holds the flywheel on is l/handed.
silly question the amc 150cc shares the same clutch as the bigger 250cc bike , but is one pair of clutch plates shorter, is there any possibility your clutch is the wider basket with more plates ??
if so the rod would need to be longer ?
just a suggestion
JH
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Clutch operation

Post  JohnB on Thu Aug 07, 2014 8:31 am

This is getting more intriguing. The engine has definitely been worked on the piston is not original and there are signs that the engine has been split. Is there a way of checking which is which clutch? Many Thanks

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clutch operation

Post  MoscowFlyer on Thu Aug 07, 2014 11:29 am

Here is a diagram of the 15T clutch. Mike

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Clutch operation

Post  JohnB on Thu Aug 07, 2014 11:59 am

Many Thanks Mike, Q. Is that another friction plate between 13 & 14 ( making 3 friction plates)

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plates

Post  piston 197 on Thu Aug 07, 2014 12:10 pm

should be 2 friction plates with backing friction material both sides and 1 top plate with one friction side and one plain side looking at the pics ?
JH
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Clutch operation

Post  JohnB on Thu Aug 07, 2014 1:00 pm

Just checked. 2 friction plates (pads both sides) 2 plain metal plates. 1 plate friction pad one side plain other side. does this support your theory J.H?

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plates

Post  piston 197 on Thu Aug 07, 2014 3:10 pm

Sounds correct to me, there is an extra pair ( one friction and one plain) in the 250cc clutch, yours sounds correct for a 15/16T
JH
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Clutch operation

Post  JohnB on Thu Aug 07, 2014 3:37 pm

Again many thanks for all your support. Guess I'm back to square one, why doesn't the rod have enough length to push the dome!. I'll investigate further and let you know the outcome (whatever that maybe)

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Clutch operation

Post  JohnB on Thu Aug 14, 2014 8:43 am

Good morning Guys, I have reassembled the clutch and there is now enough of the clutch roller protruding for the clutch lever to push against. Silly Question but should I be able to push the clutch lever by hand and subsequently push the dome away from the plates. Iv'e tried but find it impossible. Thanks

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By Hand

Post  piston 197 on Thu Aug 14, 2014 10:49 am

First question is why would you want to, ? but short answer is NO, but if you are strong enough and can stand the pain probably at a push ( a very hard push !) it could be actuated,
When operating the clutch in the normal fashion with the handlebar mounted lever , you have the combined leverage of the handlebar lever approx. 5" and the actuating lever on the gearbox approx. 2", when just pushing the gearbox mounted lever by hand the force of levers is considerably reduced
JH
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Clutch operation

Post  JohnB on Thu Aug 14, 2014 9:18 pm

I was interested to know that I had put it all back together correctly. Once again JH many thanks your help is very appreciated, sorry if some of my questions are silly, Learning as I go along.

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