MGB & GT Forum

With all of the noise and symptoms, "Your throwout bearing has failed!" "Better fix it!! They said All indications pointed towards this being a reality. Well, we pulled the engine and gearbox today, split them apart and this is what we found:

The first picture shows the clutch plate. Some wear but certainly some material left. The problem?

The second picture shows the throwout bearing. There is wear but reasonable amount of material left. Some strange chips on the outer edges and the housing is cracked on the back side. Failed? Not sure.

The third and fourth pictures show the pressure plate and a metal disk that I believe should be attached to the center of the plate. It has been broken off of the extension that rests inside of the pressure plate and has been ground down. Notice the elongated hole in the center. The problem?

Questions: What is this part called? How could this happen? Is this a common occurrence? Is this a DPO legacy?

Oh well, the car would not shift with the motor running so we had to do something no matter the cause. Now to install the new clutch disk, pressure plate and bearing that I picked up from Basil. They should do better than the last parts

Yup, the pressure plate came apart where the throwout bearing rides.

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Shaun Johnson
1972 MGB Tourer, Second Owner

Yes good old Q. H. Pressure Plate. 2 year warranty on the parts BUT you get to pay the labor to put the new parts back in. I have bought an inventory of parts & there were 3 new Q.H. P/P in the parts & I put them in the scrap can, best place for them.

While you are in there you should check the clutch fork bolt and bush for wear.

The chips on the TO bearing are from the loose bearing plate that failed a while ago based on the wear picture.

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GEO

Both and George are correct.

As outlined in a subsequent, related posting, http://www.mgexp.com/phorum/read.php?1,3576012:

- The fork bolt and bushing were replaced. The wear was hardly noticeable but I had ordered these parts anyways prior to beginning the overall clutch replacement.
- Yes, the chips are due to the failed pressure disk assembly. A wonder how it was ever able to continue operating for the extended time that it did when considering the elongated hole that was worn due to the gearbox input shaft. Fortunately, the pressure disk material is much softer than the input shaft. Only some slight scratching occurred and none in an area of concern.

That part is called the "pressure pad". RAY