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Model 50 Clutch Question

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Model 50 Clutch Question

Posted by mike_haworth at August 16. 2017

Just putting together my Model 50 following a major rebuild - trying to get clutch working. There appears to be too little movement on the clutch push rod. I am wondering if I have misplaced something during the reassembly. The push rod seems to be too short. Is it possible that there is a ball bearing missing from the assembly ? If so, where/how does it fit ?

Can't find the parts I'm talking about on the clutch exploded diagram.

Thanks in advance,

Mike

Re: Model 50 Clutch Question

Posted by John Oldridge at August 16. 2017

Hi Mike

What year is your M50?........ on my 1960, the clutch alloy plate has an adjusting screw in the middle to remove any slack in the push rod. I don't think a ball bearing is fitted to this type (unless someone has done it in the past,) but if that was the case the pushrod would be in two pieces, and the ball would fit between them............Check the operation on the cable end in the gearbox.

Regards John O

 

Re: Model 50 Clutch Question

Posted by robert_tuck at August 16. 2017

Previously John Oldridge wrote:

Hi Mike

What year is your M50?........ on my 1960, the clutch alloy plate has an adjusting screw in the middle to remove any slack in the push rod. I don't think a ball bearing is fitted to this type (unless someone has done it in the past,) but if that was the case the pushrod would be in two pieces, and the ball would fit between them............Check the operation on the cable end in the gearbox.

Regards John O

 

There is a large ball at the lever end in the inner cover ,it can fall out un-noticed at assembly time also the adjuster in the pressure plate needs to be screwed in as far as it will go then back half a turn before the cable is fitted.

Re: Model 50 Clutch Question

Posted by Ian MacDougall at August 16. 2017

If the bike is pre '57 (ie laydown box or earlier), then it is not unusual to have a ball bearing between the "mushroom" and the operating rod.

Ian McD

Re: Model 50 Clutch Question

Posted by mike_haworth at August 16. 2017

Previously robert_tuck wrote:

Previously John Oldridge wrote:

Hi Mike

What year is your M50?........ on my 1960, the clutch alloy plate has an adjusting screw in the middle to remove any slack in the push rod. I don't think a ball bearing is fitted to this type (unless someone has done it in the past,) but if that was the case the pushrod would be in two pieces, and the ball would fit between them............Check the operation on the cable end in the gearbox.

Regards John O

 

There is a large ball at the lever end in the inner cover ,it can fall out un-noticed at assembly time also the adjuster in the pressure plate needs to be screwed in as far as it will go then back half a turn before the cable is fitted.

It is a 1959 model. If a ball should be fitted, and I believe it should, how do I replace it ? Can I pull the rod out of the clutch end, insert a ball bearing, and then push the rod back in ? Or do I have to gain access at the lever end by removing the outer cover of the gearbox ? As things stand, with the adjusting screw in the alloy plate fully 'in', and using a brand new clutch cable with the cable adjuster on the gearbox housing fully 'out' I cannot move the push rod.

Cheers,

Mike

 

Re: Model 50 Clutch Question

Posted by ian_goodhall at August 17. 2017

The ball is number 87 on the drawing I've linked to below. It can only be replaced by removing the gearbox outer cover and the clutch operating mechanism. I doubt it's missing though.

Something to look at first is that the clutch operating arm, number 90 on that drawing, is engaged with the ball correctly. You can do this by looking in through the inspection/oil fill hole. If you have the pushrod completely loosened that arm can slip down so that the ball is engaged with the upper flat part of the arm rather than the rounded part where it should be.

https://andover-norton.co.uk/en/shop-drawing/303/gearbox

 

Ian

Re: Model 50 Clutch Question

Posted by mike_haworth at August 18. 2017

Previously ian_goodhall wrote:

The ball is number 87 on the drawing I've linked to below. It can only be replaced by removing the gearbox outer cover and the clutch operating mechanism. I doubt it's missing though.

Something to look at first is that the clutch operating arm, number 90 on that drawing, is engaged with the ball correctly. You can do this by looking in through the inspection/oil fill hole. If you have the pushrod completely loosened that arm can slip down so that the ball is engaged with the upper flat part of the arm rather than the rounded part where it should be.

https://andover-norton.co.uk/en/shop-drawing/303/gearbox

 

Ian

 

Many thanks Ian. This is very helpful.

Cheers,

Mike

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