Jump to content
Z320

hydraulic clutch release bearing (for TR4A-TR6)

Recommended Posts

52 minutes ago, stillp said:

I wish I had a Bugatti...

THAT is the solution!

Share this post


Link to post
Share on other sites

Ended with 92 GBP, the other one ended with 67 GBP....

What might one of our complete working unit  be worth?

With the parts we ordered to make them we sadly have one unit too much.

edit 25.09.2019, sold today to a good friend who heard some rumors about our project

Edited by Z320

Share this post


Link to post
Share on other sites

This TR3 clutch I got borrowed from a friend for a closer look, weight is 7.3 kg

1962073080_51TR3clutchweight.JPG.4fc3750b7f1cabbbb982251a47bc401a.JPG

On the fingers I realize where the release bearing touches them

1754482205_52releasebearingrunsonthetips.JPG.9fdeee8ba9939d9848e5e07e3cc075e0.JPG

Origininal release bearing from a TR4A-TR6

473386532_52originalreleasebearing.JPG.6777890a7b77adac0003b1ae4477e93b.JPG

Closer look

1077301338_53closerlooktooriginalreleasebearing.JPG.0b1a493a5eb5240c51b50667f434e959.JPG

Closer look on the Sachs release bearing - I guess this will not work.

2055900636_54closerlooktoSachrelasesbearing.JPG.ea777050cc0afac496e1dcc050f4ddde.JPG

Sorry to all TR2-4 downers....

 

 

Edited by Z320

Share this post


Link to post
Share on other sites

You can always have the TR3/4 flywheel drilled and tapped to accept the diaphragm clutch

like this. 

6404EF36-B795-4F2B-BD72-6A0A049FBFD2.jpeg

Share this post


Link to post
Share on other sites

Hi Hamish,

you shure took the flywheel off from the engine to drill it on the drilling machine?

Marco

Edited by Z320

Share this post


Link to post
Share on other sites

Yes. 

I cant claim the expertise of doing  it. I had it drilled by someone who has a template for the threaded holes and the dowl / peg holes.

Share this post


Link to post
Share on other sites

I wonder how accurate you can get the centering holes (and what is originally achieved, Even if only  a bit off, it would have significant effect on vibrations. But if you would balance the whole assembly (minus the driven plate) that would not matter.

Waldi

Share this post


Link to post
Share on other sites

Bob already told at another post the new clutch could already be the template....

I guess the most accurate drills only must be the two centering pins to get the unit in the correct position.

For a mechanic this should be a solvable challenge.

Share this post


Link to post
Share on other sites
On 9/15/2019 at 9:30 AM, Z320 said:

This TR3 clutch I got borrowed from a friend for a closer look, weight is 7.3 kg

1962073080_51TR3clutchweight.JPG.4fc3750b7f1cabbbb982251a47bc401a.JPG

On the fingers I realize where the release bearing touches them

1754482205_52releasebearingrunsonthetips.JPG.9fdeee8ba9939d9848e5e07e3cc075e0.JPG

Origininal release bearing from a TR4A-TR6

473386532_52originalreleasebearing.JPG.6777890a7b77adac0003b1ae4477e93b.JPG

Closer look

1077301338_53closerlooktooriginalreleasebearing.JPG.0b1a493a5eb5240c51b50667f434e959.JPG

Closer look on the Sachs release bearing - I guess this will not work.

2055900636_54closerlooktoSachrelasesbearing.JPG.ea777050cc0afac496e1dcc050f4ddde.JPG

Sorry to all TR2-4 downers....

 

 

FWIW The release bearing is different for a spring clutch (TR2/3/3a/4) to a diaphragm clutch  (TR4a/5/6)

Stuart.

Share this post


Link to post
Share on other sites

Hi,

all 4 sets are ready and will go out at Monday to their owners.

203513041_55all4setsareready.JPG.4458746febfdc75d0cfc5c12b302e8ea.JPG

I guess I will fit mine in Dezember or January on the car, so it is time for some other projects (already started).

P1140149-b.JPG.ad5cce3b25bc6154aaddbcdcebe29f8d.JPG

For any question please ask.

Ciao, Marco

Share this post


Link to post
Share on other sites
16 minutes ago, RogerH said:

Hi Marco,

I like your wine bottle cork pipe seals.

 

Roger

Guess how much wine I had to drink for my friends....!

Share this post


Link to post
Share on other sites

Hi,

it's me back on this post again, tomorrow the gearbox will be out of the car, before I checked some things.

With my lovely wife behind the steering wheel  first i checked the way my 0,625" master cylinder can be pushed.

638892457_56checkingmastercylinder0mm.JPG.e3c6839707c5bc30ec468f695fb1b2bf.JPG  427145117_57checkingmastercylinder34mm.JPG.cd5974a32664fb15dfa55b54af7a275f.JPG

About 34 mm is a volume of 6,72 ml (cm³) that will move the hyraulic release bearing for about 9 mm,

34 mm is more than the 31 mm which I remember with the 0,75" master? Is the 0,625" different deep?

Next I measure indirect the way behind the sleeve of the release bearing, on the leaver about 14 mm,

that's probably about 14 mm x 65/87 = 10,45 mm behind the sleeve (see my first post).

This could be interesting for a different modification of the gearbox front cover (where the sleeve slides on).

1829081018_58checkingplaybehindsleeve00mm.JPG.b5f61a77e643b675e71a35fb0d829427.JPG  801080108_59checkingplaybehindsleeve14mm.JPG.e523fbc4da373838577e4b9d517df78a.JPG

Last, the force I have to step on the pedal, about 20.5 - 21.5 kg, that's OK for me but I want less.

2049974730_60checkingforce21kg.JPG.58013971ca94aa03eb283e7314d85a56.JPG

That's it for today,

Ciao, Marco

Edited by Z320

Share this post


Link to post
Share on other sites

Hi,

had to do differnt things the last days but die gearbox is out.

A little bit oily inside but looks worse than it is, the RHP release bearing runs free and easy.

1792727327_61gearboxout.JPG.51ccd0a7281ccb3b2af598907f9d9d4d.JPG

But what I realized on the fingers of the diaphragm spring is - the bearing is too wide, the lenght of the finers are not fully used.

Shure this was already the case in 2012 but I did not think this to the end.

1052755018_62Kupplungsautomat.JPG.3f5e57a09ad4f216ebc65f7b9c19c009.JPG  867325721_63RHPreleasebearing.JPG.1b91164d9ade36879df4b3c4e1f55991.JPG

The Sachs hydraulic bearing will be in contact direct on the end of the fingers - I should make a different photo to show this.

294154463_64Sachsreleasebearing.JPG.719c609bbcb9ce770756b5250b2f7fb3.JPG

Ciao, Marco

 

Share this post


Link to post
Share on other sites

Return to the post above I checked the gap behind the sleeve with a small piece of wood, 10.5 mm thick.

Indeed 10.5 mm gap is 14.5 mm way on the leaver. So with the collected information from my "thickness of a new clutch dics" I can

check the space I can use for the hydraulic release bearing.

Share this post


Link to post
Share on other sites

Well,

some of you may ask yourself (or not):

"Why does he not continue with the assembly? Are there any problems or serious reasons for this?"

P1160039-b.JPG.7dc49d0e785f9d9255ea1d77e1915152.JPG

I'm now at this point, TR gearbox is cleaned, and soon I will continue.

 

 

 

The "delay" is because the thing left from the TR gearbox...

P1160042-b.JPG.4dd5694b78cc4bbb5944ee25a8e8cc7e.JPG

Stupid accident :D

Ciao, Marco

Share this post


Link to post
Share on other sites

Oh Marco,

Looks here is a new challenge. Does SHE now?
Waldi

Share this post


Link to post
Share on other sites

My lovely wife? Shure!

She received the delivery 

Share this post


Link to post
Share on other sites

Hi,

have lots of work at the office, so the progress on the hydraulic clutch release bearing sadly slowed down.

Here some impressions from the assambly before first fit on my spare part engine.

564805032_66assably01.JPG.ebdc8cf36b5f0b3e2533910ceec28ccb.JPG  1584595875_67assably02.JPG.76aa50188fa81443b471827ae1255d10.JPG 

732350454_68assably03.JPG.074fb3759d7e728ce0a69c3d87e95d3c.JPG  

That's the moment to check the pre-load of the Sachs-hydraulic. What is about this?

Stepping on the clutch pedal moves the piston of the master cylinder in - and the piston of the central hydraulic out.

We calculated: a 0,75" master moves this central hydraulic out about 13 mm, a 0,70" master does it about about 11 mm, my 0,625 master about 9 mm

Therefore the central hydraulik has to be pre-loaded for about 15 mm by bolting the gearbox against the engine.

This is how I checked it:

This bar is the end of the, I measure the bearing is about 67 mm in the gearbox bell housing.

1799750984_69deepofthehydraulic01.JPG.febc739f91e890180fea89426180a52f.JPG  415320659_70deepofthehydraulic02.JPG.3977420c43762085a3a969f44368b6e4.JPG

This bar is in touch with the end of "the fingers" of the diaphram spring, this is about 85 mm in the gearbox bell housing.

1087381066_71problemfinding.JPG.fe7dd57732c7f9ab96b8a711980b0cc9.JPG  1654056724_72BBclutch85mmdeep.JPG.f45f663e8f1f2af4fb90d151e7b9176c.JPG

So the pre load is abot 67 - 85 mm = - 18 mm, and this hydraulic can be compressed about 20 - 21 mm.

That's OK, compression would be about 5 mm less with a new clutch disc, still OK for the 0,70" and my 0,625" master.

 

That's it for the moment, I have to stop this for some measurement and experiments on the other gearbox.

Ciao, Marco

Edited by Z320

Share this post


Link to post
Share on other sites

Hi Marco,

looking good. I assume you want to use the MX5 box for the extra gear. Is the final drive ratio “better“ too?

The Triumph GB has an integrated bell house (one casting for box and bell), are you planning to use an adapter plate to mate the mx5 GB with TR engine?
Cheers,
Waldi

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.