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Any reports on the self centring pull rod?
#786242 10/05/19 12:47 am
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Re: Any reports on the self centring pull rod?
Steven A #786269 10/05/19 8:52 am
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The problem with the original version is when the release bearing seizes.
The pull rod is a tight fit in the bearing and winds itself out through the clutch inspection cover and then snaps.

Happens at speed - you get a sudden rise in rpm then back to normal.
When you try changing gear you find the clutch isn't working.

This version of the pull rod stops that.

Now on my second one - the first one I found the cone bit had seperated from the shaft.

Last edited by Simon750-3; 10/05/19 8:54 am.
Re: Any reports on the self centring pull rod?
Simon750-3 #786270 10/05/19 9:13 am
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Originally Posted by Simon750-3
The problem with the original version is when the release bearing seizes.
The pull rod is a tight fit in the bearing and winds itself out through the clutch inspection cover and then snaps.

Happens at speed - you get a sudden rise in rpm then back to normal.
When you try changing gear you find the clutch isn't working.

This version of the pull rod stops that.

Now on my second one - the first one I found the cone bit had separated from the shaft.


That doesn't sound any good. Did it break?

Re: Any reports on the self centring pull rod?
Steven A #786281 10/05/19 12:18 pm
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Originally Posted by Steven A
That doesn't sound any good. Did it break?

I didn't find it until I went to change the chain. So it was working fine - cone was just loose on the rod.
Maybe heat+cooling did for it.
Probably could have re-used but decided to renew.

Re: Any reports on the self centring pull rod?
Steven A #786306 10/05/19 6:50 pm
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Mine went through the inspection cover when the cone parted company with the shaft. Have my 69 T-150 since 1986. The orig. pull rod went back in with a new bearing and works fine. That was 11 yrs. ago

Re: Any reports on the self centring pull rod?
Simon750-3 #786322 10/06/19 12:34 am
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Originally Posted by Simon750-3
Originally Posted by Steven A
That doesn't sound any good. Did it break?

I didn't find it until I went to change the chain. So it was working fine - cone was just loose on the rod.
Maybe heat+cooling did for it.
Probably could have re-used but decided to renew.

Where you using it in conjunction with the expensive angular contact ball race upgrade to the clutch?

Re: Any reports on the self centring pull rod?
bodine031 #786323 10/06/19 12:35 am
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Originally Posted by bodine031
Mine went through the inspection cover when the cone parted company with the shaft. Have my 69 T-150 since 1986. The orig. pull rod went back in with a new bearing and works fine. That was 11 yrs. ago


Where you using the taper pull rod with the expensive angular contact ball race upgrade to the clutch?

Re: Any reports on the self centring pull rod?
Steven A #786344 10/06/19 7:48 am
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Originally Posted by Steven A
Where you using it in conjunction with the expensive angular contact ball race upgrade to the clutch?


yes

If you hold the clutch in for too long the old style release bearing heats up and the grease can be lost..
The angular bearing is designed for side thrust and is better to handle the loads. Must install the right way and its not easy to see !

Don't realy know whether the cone slips in the bearing as there isnt much contact area or if the bearing always spins.
If it slips you would get wear and heat due to friction - haven't seen wear but maybe heat colouration on the first.

I would not go back to the original parts - failure is more likely and more expensive.

The breaking that has been reported is likely due to machine cut threads weakness - rolled threads are better.

Re: Any reports on the self centring pull rod?
Steven A #786445 10/07/19 10:19 am
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I bought mine years ago [early '80's I think?] from Hyde. Never had an issue, just works, Probably one of the few things that Norman actually made hard enough clap

Re: Any reports on the self centring pull rod?
Steven A #786541 10/08/19 4:00 am
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I guess it really must be bought as a set with a bearing beveled to match the rod, otherwise the contact area is too small.
In many years of owning my '74 I only broke one pull rod, probably due to my incorrect setup of the actuating mechanism. But, I never sit at traffic lights with the clutch pulled.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"

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