[Mgs] clutch/trans question

Osborne, Paul paul at ece.rochester.edu
Wed Jun 7 06:17:25 MDT 2017

Lets see if I can add my 2cents as why roller bearings will not work ( for very long)  The end of the bearing fork travels in a arc, not paralel  to the trans. input shaft. As the bearing moves towards the flywheel to release the clutch it too is moving an an arc. So when in contact with the plate release contact one side of the bearing is moving faster than the other side so it starts to scrub and the bearings flat contact surface begins to wear out.As soon as it fails the balls fall out, failure.  The carbon release bearing is much better suited for this unequal surface speeds and slowly wares away. This is one of the best reasons that when you are at a stand still do not keep the clutch engaged. (like at a stop light)  I seemed to remember seeing a J Twist clip about this too a long time ago. 

make sense ? 

> Paul Osborne
> Department of Electrical and Computer Eng
> University of Rochester 
> 201 Hopeman Building RC
> Rochester NY 14627

> On Jun 7, 2017, at 4:49 AM, PaulHunt73 via Mgs <mgs at autox.team.net> wrote:
> Agree, my roller bearing recently collapsed, but it can happen with carbon as well as that failed in a similar way previously.  The problem is that the release arm is rarely concentric with the first-motion shaft on the MGB (at least), so pressure on the bearing and cover-plate is not equal all round, which causes rapid wear one side.  Knackered bearing and offset here https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mgbimages.uk.gridhosted.co.uk_images_clutchr305.jpg&d=DwICAg&c=kbmfwr1Yojg42sGEpaQh5ofMHBeTl9EI2eaqQZhHbOU&r=j_uK0-rtrtcKZ8O0aGq-Y5ZUDfHjCD_Cv57WMn_czag&m=eQ9jtCbQ-UuI1GPw7jVYM66x9CW7UUlEOdo2gVpurrk&s=5Q1wC6KbuqcXmGn2vZFuGI5jcvAxcdXQ_op9DCzwW4Y&e= , with cover-plate damage here https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mgbimages.uk.gridhosted.co.uk_images_clutchr304.jpg&d=DwICAg&c=kbmfwr1Yojg42sGEpaQh5ofMHBeTl9EI2eaqQZhHbOU&r=j_uK0-rtrtcKZ8O0aGq-Y5ZUDfHjCD_Cv57WMn_czag&m=eQ9jtCbQ-UuI1GPw7jVYM66x9CW7UUlEOdo2gVpurrk&s=hFTJv8lHBMii0-TCp3aNO1G3QfQMZ0sAzj_z80VS_Hs&e= .  I suspect mine was particularly bad, and I had to machine the pivot bolt hole one side and put a spacer on the other to bring it closer into line.  For that reason roller-bearings aren't the be-all and end-all for the MGB.  You may be lucky and have better alignment, maybe not.  Modern cars, the factory V8 and 1500 Midgets do have them as standard, but there is a guide tube round the shaft which keeps the bearing concentric.
> PaulH.
> ----- Original Message ----- 
>> > My 65B has started squealing when I push the clutch to the floor and
>> it is definitely coming from the rear of the engine.
>> The top of my list of suspects would be the throw out bearing. Especially if it is a roller bearing.
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