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Post by andrewa on Apr 2, 2014 7:58:51 GMT
Just getting to the stage of putting engine and gearbox back together and I'm wondering if this is a better option than the std offering - and most importantly does anyone know if it'll fit? "A superior clutch release bearing is available
for MGB models, offered by MGOC
Spares part number GRB106R. This roller
type release bearing design provides
greater service life and reliability over the
standard carbon material bearing that is
designed to erode in use and is also susceptible
to uneven wear and premature failure. The
roller type bearing contact ring has a special
surface coating and rotates on a lubricated
steel bearing.
The bearing contact ring pivots to ensure
equal surface contact with the clutch plate
cover. The roller type bearing requires no
maintenance and is supplied ready to fit at
£25.95." Comments /views pls! Andrew |
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Post by dave1800 on Apr 3, 2014 1:38:03 GMT
Hi Andrew As no one has yet commented I will add some thoughts. Are you absolutely sure that the MGB clutch release roller bearing is the same size and fitting as the 1800? The clutch plates are certainly different. It's a big job to rectify as you know well  If you look at the Australian website austineighteenhundred as a member you can read up in the LOCA magazines about the conversions carried out there many years ago. Some Oz owners were satisfied others suffered premature failures. (The Oz mods involved changes to the clutch cover which I don't believe is the case for the MGB style, so this is of interest only from a point of principle). The current issue is that there have been reports of very poor quality carbon release bearings that have failed after very few miles and difficulty in knowing if you have a good quality one. For a carbon thrust bearing to have a good life span it is important that the alignment is perfect, so any wear in the actuating arm/ bearings for example will increase wear rapidly. Remember there is no adjustment so the carbon is in light contact with the clutch plate all the time in the same way as disc brake pads. Reports on MGB forums suggest these roller bearings are good and some have devised a way of pulling the bearing away from the plate so it is not permanently in contact when the clutch isn't actuated - otherwise the bearing will rotate all the time. I'm not sure that would be possible on the 1800 and still enable full disengagement? If you search through the Australian website you will see an excellent article by Tony Cripps on the 1800 clutch and the need to match the clutch plate, release bearing, m/s pushrod etc as these have all changed over the years and with no adjustment to the clutch a perfect match is essential to ensure full movement, or make mods he describes with measurements. If the MGB bearing is the right size then it would appear to be a good option based on what MGB owners have written. You would of course need to ensure it aligns properly as with a carbon thrust bearing and maybe consider whether you can stop it rotating all the time. Good luck, grateful for feedback as this is an important consideration for many Landcrab owners. David Just getting to the stage of putting engine and gearbox back together and I'm wondering if this is a better option than the std offering - and most importantly does anyone know if it'll fit? "A superior clutch release bearing is available
for MGB models, offered by MGOC
Spares part number GRB106R. This roller
type release bearing design provides
greater service life and reliability over the
standard carbon material bearing that is
designed to erode in use and is also susceptible
to uneven wear and premature failure. The
roller type bearing contact ring has a special
surface coating and rotates on a lubricated
steel bearing.
The bearing contact ring pivots to ensure
equal surface contact with the clutch plate
cover. The roller type bearing requires no
maintenance and is supplied ready to fit at
£25.95." Comments /views pls! Andrew |
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Post by andrewa on Apr 3, 2014 7:11:54 GMT
Thanks for this. I've had a look at some MGB forums about this mod, and particularly in the USA, comments are mixed (what a surprise)between swear by it, swear at it and no real difference! Thanks for the pointer to the Ozzie site - really useful stuff there. The issue as you so rightly point out is not there was anything wrong with the original arrangement but trying to find a quality replacement is not always straightforward. I'll keep you posted, but want to get off the fence in the next day or two as the car is painted and starting to go back together and engine/gearbox still separate! Really wanted to get to Pride of Longbridge in it this year but I reckon I'll be a week or two late..
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Post by foglaursen on Apr 3, 2014 8:01:17 GMT
The MGB release bearing is smaller than the Landcrab bearing, so it cannot be used. Regards Peter  |
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Post by dave1800 on Apr 4, 2014 2:10:54 GMT
Peter, thanks for the info; it's a shame though. regards David The MGB release bearing is smaller than the Landcrab bearing, so it cannot be used. Regards Peter |
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bandit1
Member
Posts: 34 
Attribute: Technical Expert
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Post by bandit1 on Jul 31, 2014 13:30:42 GMT
I remember years ago in the dark old days of the 70s that an uprated ball bearing type instead of the carbon material was avaliable, I fitted one to my ex RAF mk2 at that time when I did a clutch change but speaking to a few loci members fairly recently no one had heard of such a bearing, I certainly fitted one and it was a definate improvement, no slight slowing of the tick-over for a start and much quieter, Iv"e seen the mgb ones and they look very much the same !
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