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Post by cptkennykidna on Jun 26, 2015 12:25:39 GMT
your thrust bearing will soon be obsolete, what do we do?. I have looked at a number of alternatives, about 5 so far. I was looking for something that was reasonably easy to install and long lasting. I wanted something that retained the thrust face on the pressure plate diaphragm giving the best fulcrum action, that is, the lightest action on a standard system. I think I have found the answer, and have a part number for this ball race self centring bearing. I have this set up operating now in a 1800 utility that has just had the power unit rebuilt, it is behaving very well so far, but I need to clock a lot more miles to confirm reliability. love to show the photo,s but do not know how.
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Post by dave1800 on Jun 26, 2015 15:03:54 GMT
That's really interesting. I know there have been quite a few problems with the thrust bearings recently. If you send the photos to me as an email attachment I will post them here for you. Regards David your thrust bearing will soon be obsolete, what do we do?. I have looked at a number of alternatives, about 5 so far. I was looking for something that was reasonably easy to install and long lasting. I wanted something that retained the thrust face on the pressure plate diaphragm giving the best fulcrum action, that is, the lightest action on a standard system. I think I have found the answer, and have a part number for this ball race self centring bearing. I have this set up operating now in a 1800 utility that has just had the power unit rebuilt, it is behaving very well so far, but I need to clock a lot more miles to confirm reliability. love to show the photo,s but do not know how.
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Post by dave1800 on Jul 9, 2015 2:19:32 GMT
Ken Here are your photos. I've attached them to your original post so that it makes sense. Many thanks. I'm sure there will be a lot of interest to see whether this is a long term answer to those carbon thrust bearings. I've sent you an email. Regards David [a href=" "]Clutch release bearing 1[/a] [a href=" "]Clutch release bearing 2[/a] [a href=" "]clutch release bearing[/a] [a href=" "]Clutch release bearing[/a] your thrust bearing will soon be obsolete, what do we do?. I have looked at a number of alternatives, about 5 so far. I was looking for something that was reasonably easy to install and long lasting. I wanted something that retained the thrust face on the pressure plate diaphragm giving the best fulcrum action, that is, the lightest action on a standard system. I think I have found the answer, and have a part number for this ball race self centring bearing. I have this set up operating now in a 1800 utility that has just had the power unit rebuilt, it is behaving very well so far, but I need to clock a lot more miles to confirm reliability. love to show the photo,s but do not know how.
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Post by dave1800 on Jul 18, 2015 10:52:57 GMT
I have been in communication with Ken (cptkennykidna) about the roller bearing as I spotted that John Twist had posted a video on Youtube around 1 week ago describing why it isn't suitable for a MGB. Ken has kindly provided me with a very detailed response well worth reading and food for further consideration:-"the feedback that I got from the two main MG workshops in Perth is, sportscar garage Tim Harland said the same thing, that is you get screeching as the bearing moves from out of centre too centre. Peter Harper from TMG engineering said after looking at the mod said it will most likely be o.k. as the 1800 has a smaller arc on the fulcrum, we also have to note that the 1800 also has a much thinner pressure plate that requires a much smaller movement to open the the friction surfaces. That means it opens almost dead centre. the self centering race hopefully will compensate for a small amount of movement.
So far the ute has done 300 miles, and there is no sound or evidence of a problem, have to give it a bit longer, but thumbs up so far. There have been other thrust bearings used by 1800 owners in Aus, notably the Nissan Pintara, it has worked with no complaints. Also one bearing from a Chrysler app worked fine, but both of these bearings require the removal of the triangular thrust face on the pressure plate, that is the bearing is set higher in the carbon race and it pushes against the diaphragm fingers as a lot of modern cars do. The idea with this bearing is that it applies pressure at the centre of the diaphragm as the original did, giving the lightest effort to open.
I will just point out that the MGs have a deep pressure plate, long fulcrum, and a big bell housing. they also have a different bore size on the slave cylinder, i have sold quite a lot of the 1" units from 1800s to them in the past, so the 1800s have far closer engineering on the clutch.
The old thrust bearings even when the carbon is down to metal and 6mm past that, about 10mm from original height they are only 1.8mm out of centre.
Although that is not always the case, the roller type should not wear or go out of centre. The reason the MGBs use a smaller slave is because they need more movement, the bigger arc. It is worth noting that adding length to the 1800 slave cylinder rod achieves nothing, the Mini & 2200s have adjustable and lockable set up to take the slack up plus a spring to hold the bearing back.
The carbon setup is not really suited to this arrangement but the roller bearing type can be made adjustable and restrained with a spring, not that it should be necessary.
I still have not found the bearing manufacturer even though I have a part number, it does not lead to anything when it is googled, I can still get it from brake bonders Australia, but they cannot give me the important info, that is what it is used on & can I get it cheaper, not that it is important until the trial's over."
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David
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Post by dave1800 on Jul 21, 2015 13:37:42 GMT
Photos now added to previous post now I have access to my Photobucket account again.
It will be interesting to see whether this is the answer to the carbon thrust bearing problems. Looking good so far.
David
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