Heavy duty throwout bearing : MGB & GT Forum : The MG Experience

Heavy duty throwout bearing #1
rhinsb Rich Hagon Santa Barbara, CA, USA Sign in to contact 1971 MG MGB GT "Money Pit"	Topic Creator (OP) Sep 2, 2009 01:45 PM Joined 17 years ago 1,299 Posts

http://www.bpnorthwest.com/.sc/ms/dd/ee/10592/Release Bearing Heavy Duty MGB

Anyone know anything about these? Good idea?

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Re: Heavy duty throwout bearing #2
Steve64B Steve Opitz Phoenix, AZ, USA Sign in to contact 1966 MG MGB	Sep 2, 2009 02:02 PM Top Contributor Joined 17 years ago 11,646 Posts

Well my carbon TO just started making noise after only a few thousand miles... so I'm thinking this can't be any worse!

I know there was an earlier incarnation of the sealed roller TO that had problems... I let you know.

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Re: Heavy duty throwout bearing #3
underdog Jim Underwood Pittsburgh, USA Sign in to contact 1972 MG MGB 1980 Triumph TR8 "Fabulous Trashwagon" 1999 Chevrolet Corvette "Darth Vader" 1999 Chevrolet S10 "Spare Change" & more	Sep 2, 2009 02:09 PM Joined 16 years ago 10,355 Posts

There's been one in my car since I got it in 92. Funny thing is I was looking for some wiper blade screws for a friend when I came across another one in my parts stash. Says made in UK with a number. I must have saved it from a parts car a long time ago. It's a little dirty but still turns nice & smooth. I think they were a great idea and don't understand why the quit making them. Hopefully the quality on this one is good because the concept is great IMO.

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Re: Heavy duty throwout bearing #4
rhinsb Rich Hagon Santa Barbara, CA, USA Sign in to contact 1971 MG MGB GT "Money Pit"	Topic Creator (OP) Sep 2, 2009 02:50 PM Joined 17 years ago 1,299 Posts

My trans is out while we paint so it would be easy to change now. If I have time I'll call them for the scoop. I remember someone in LA (Drew?) put one together I think from a Nissan but I never heard how it worked out.

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Re: Heavy duty throwout bearing #5
69GT Robert Tyree Murrieta, CA, USA Sign in to contact 1969 MG MGB GT "The B" 1975 MG MGB "Tangerine Sky"	Sep 2, 2009 03:01 PM Joined 17 years ago 1,694 Posts

I wish I'd seen this a month ago.....

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Re: Heavy duty throwout bearing #6
ingoldsb Terry Ingoldsby Calgary, AB, Canada Sign in to contact 1971 MG MGB	Sep 2, 2009 04:55 PM Top Contributor Joined 20 years ago 20,161 Posts

You will get varying opinions as to whether the bearing style TO bearings are better. Personally, I've never had any trouble with the carbon units.

A few years ago I saw a throwout bearing that was an annular piston/cylinder. It bolted to the transmission housing (like a donut around the input shaft) and the hydraulic line connected directly to it - it eliminated the lever altogether. Personally, I think that might have been the best solution, but I've never seen them since.

Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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Re: Heavy duty throwout bearing #7
Steve64B Steve Opitz Phoenix, AZ, USA Sign in to contact 1966 MG MGB	Sep 2, 2009 05:08 PM Top Contributor Joined 17 years ago 11,646 Posts

Well, I ordered one because I have to change the TO and well, what the heck!

About an hour after they confirmed the order they sent another email saying they had to modify the order... they were going to charge me less for the shipping!

Yea... price going down!

Good customer service!

Terry, this might have been what you saw:

http://www.cambridgemotorsport.com/MGB-Co-axial-Hydraulic-Clutch-Release-Kit

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Re: Heavy duty throwout bearing #8
danc Dan Cramp Menifee, Ca., USA Sign in to contact 1967 MG MGB GT 1971 MG MGB	Sep 2, 2009 05:11 PM Top Contributor Joined 19 years ago 4,254 Posts

My TO bearing went out after 500 miles. I am going with this one when I pull the motor. Just hope it did not hurt the pressure plate when it went.

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Re: Heavy duty throwout bearing #9
davidsauer1 David Sauer Cincinnati, Ohio, USA Sign in to contact 1973 MG MGB GT 1977 MG MGB 1978 MG Midget 2011 Subaru Impreza	Sep 2, 2009 05:16 PM Joined 17 years ago 3,091 Posts

Steve64B Wrote:

Quote: Well, I ordered one because I have to change the TO and well, what the heck!
About an hour after they confirmed the order they sent another email saying they had to modify the order... they were going to charge me less for the shipping!
Yea... price going down!
Good customer service!
Terry, this might have been what you saw:
http://www.cambridgemotorsport.com/MGB-Co-axial-Hydraulic-Clutch-Release-Kit

Those guys are great. I order from them all the time.

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Re: Heavy duty throwout bearing #10
Erich Erich B MD, USA Sign in to contact	Sep 2, 2009 05:18 PM Joined 18 years ago 52 Posts

Never had a problem with the carbon TOBs on MGBs

On mustangs, however....the bearing type ones are held into the clutch fork by small spring clips that break.

Score one for MGBs!
Erich

1972 MGB-450,000+ miles (seen a few engines tho) undergoing floor/sill replacement
1989 Mustang DIY twin turbo
1997 Mustang Built Lincoln 4V motor Procharger d1SC

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Re: Heavy duty throwout bearing #11
bobmunch Bob M Ontario, OR, USA Sign in to contact	Sep 2, 2009 05:23 PM Joined 24 years ago 12,897 Posts

My most recent luck with a carbon release bearing was replacing one last Nov. after 76K miles. It was part of an AP Borg & Beck kit that had been installed back in the early 90s, and finally blew up last year. They can survive longer than mine did, but many don't, probably depending more on who markets what than anything inherent in the concept or design.

It would be nice to have more info on this T/O bearing ~ who makes it, is it really a direct replacement, what has been other folks experience with these? There is nothing inherently bad about trying to use a roller bearing T/O bearing, but there needs to be some history and specifics on this particular (or any other) unit for folks to be able to make an informed decision.

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Re: Heavy duty throwout bearing #12
SafetyFast Shareef Hassan Murrieta, CA, USA Sign in to contact 1966 Volkswagen 1300 1973 MG MGB	Sep 2, 2009 05:29 PM Joined 16 years ago 573 Posts

I am curious about the throw-out bearing. Anyone have any negative experinces with this roller bearing. Seems like a great idea in theory. The last roller bearings I heard wore out prematurely from constant contact, and Doug Jackson used to offer a kit with a spring to give some clearance. I thought Moss discontinued carrying them because the quality was hit or miss.

I wore my last carbon faced one out in 2500 miles, but this is with a HD clutch plate. My foolishness, for ordering the HD components. I ordered a normal clutch plate, but the car is not together yet.

Thanks

Safety Faster! www.safetyfaster251.com

Unique parts for 4-cylinder MGB

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Re: Heavy duty throwout bearing #13
John Davis SE Pa., USA Sign in to contact 1974 MG MGB GT V6 Conversion 1993 Mazda MX-5	Sep 2, 2009 05:39 PM Joined 19 years ago 2,039 Posts

I had good sucess with the carbon bearing, but I also don't sit at traffic lights with the pedal down. IIRC there was a problem with the roller bearing type wearing prematurely because the large diamater slave cylinder kept enough pressure on them to keep it running. At one time there was a link showing a modification that pulled it back slightly to prevent that. A search may turn it up, but it has been several years ago.
John

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Re: Heavy duty throwout bearing #14
Redwind Charlie Hopek So. Cal, USA Sign in to contact	Sep 2, 2009 05:42 PM Joined 15 years ago 1,337 Posts

As Shareef mentioned the main problem with the roller bearing is constant rotation and early wear. Found this in the archives of British cars. net:

There is no pull off spring for the throw out arm and bearing to pull the bearing (carbon block) off of the thrust surface of the pressure plate and as a result the bearing is in constant contact with the rotating surface. This is a very light contact and doesn't contribute wear on the carbon block, but it is sufficient to keep a modern, ball bearing spinning constantly which results in the lubricant drying out, causing premature failure of the bearing. Doug Johnson of British Automotive used to have a modification kit to add a pull off spring. This spring is mandatory if one is going to use a ball bearing type of throw out bearing.

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Re: Heavy duty throwout bearing #15
rhinsb Rich Hagon Santa Barbara, CA, USA Sign in to contact 1971 MG MGB GT "Money Pit"	Topic Creator (OP) Sep 2, 2009 06:45 PM Joined 17 years ago 1,299 Posts

Charlie, I read the same thread and there was someone who said they ran one for years with no issues. British Automotive has a link to someone that will make the spring kit.

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