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Dnepr clutch push rods


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#1 Northernduck

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Posted 22 July 2017 - 10:23 PM

I have a 1980 M10 36 and I suspect the clutch push rod is spinning in the square hole in the pressure plate by an awful noise and vibration at the clutch lever. I installed an old rod that had a circular groove at the base of the square end. I wasn't sure if this was wear or design. Are these rods supposed to spin with the clutch when it is not depressed? Any help appreciated.

#2 Vance Blosser

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Posted 23 July 2017 - 06:31 PM

If it's setup like a Ural it turns all the time. There is a bearing under the piston the clutch lever pushes on that transmits the force to the rod, if this wears it will make noise. Also if the groove you mentioned is too deep it will slip in the clutch plate and make a noise, and will need to be replaced.

#3 propwash

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Posted 25 July 2017 - 03:18 PM

The rod is not designed to spin within the square hole in the pressure plate.
What you are seeing is common long-term wear.

You will likely need a new rod and pressure plate.

#4 Northernduck

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Posted 07 August 2017 - 10:37 PM

Many thanks Vance and Propwash. In hindsight it was obvious but not when I installed the old rod. It turns out that it was the thrust bearing assembly that was disintegring. I didn't have a replacement for the worn races at the time of reassembly so I fitted washers that were quickly consumed by the harder bearings. Fixed now with old parts smoothed on a lathe and should keep till I get replacements. Good learning though. It is in fact possible to remove gearbox without unfastening the engine...

#5 haj

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Posted 11 August 2017 - 02:55 AM

them pushrod bearings are hard to come by in good quality.. Since I run a CJ gearbox on my K750 I'm thinking about getting this set;
http://sidecarpro.co...ng-plunger.html
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#6 Northernduck

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Posted 11 August 2017 - 07:04 PM

Thanks for that. Definitely better machining than my original and i imagine the roller bearings are better than balls.
Regards

#7 luca.stere

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Posted 12 August 2017 - 01:56 PM

View Posthaj, on 11 August 2017 - 02:55 AM, said:

them pushrod bearings are hard to come by in good quality.. Since I run a CJ gearbox on my K750 I'm thinking about getting this set;
http://sidecarpro.co...ng-plunger.html

View PostNorthernduck, on 11 August 2017 - 07:04 PM, said:

Thanks for that. Definitely better machining than my original and i imagine the roller bearings are better than balls.
Regards

That solution from sidecarpro should be a good one, that bearing is real steel. I have solved this problem with the help of a turner on a lathe machine.

First I have rebored the clutch cylinder with a cast iron sleeve:

Posted Image

Rectified the clutch piston:

Posted Image

And I have adapted an SKF bearing:

Posted Image

Now it realy is better then the factory one!




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