Clutch release bearing

[Duras Stag]

I have just replaced the clutch release bearing. When starting the engine, gearbox in neutral, a loud squealing came from the clutch area, worse when the clutch depressed. Engine out again ( it knows its own way now ). I found the release bearing contact area with diaphragm was not able to turn, thus metal to metal contact. The bearing itself turns freely but has no contact with the clutch. the new bearing, supplied by a large classic car parts dealer, was a KYK HORCT52S heavy duty made in Japan. Has anyone else had this problem?

[brian0443]

Post moved from Technical Section

[Duras Stag]

Have just resolved the problem, The problem was no indication which way round the bearing fitted as both surfaces looked like mild steel.

[LAMBRETTLAD]

Murphy got you !!!

[SGN]

Have just resolved the problem, The problem was no indication which way round the bearing fitted as both surfaces looked like mild steel.

I have this bearing, not fitted it yet, I'm converting to manual when I get all the parts together.
Can you tell me where the mistake came from, just so I get mine correct, the face that is pressed on to carrier is flat, the side facing the clutch is domed.
Cheers
Steve
IMG_0578.jpg

[les M]

Gent's
Just be aware that this bearing KYK RCT52S is not rated as a constant contact bearing unlike the original stag fitment, it is sold as a heavy duty replacement for the TR5/6 and stag. The bearing is original fitment on the Toyota Land Cruiser. To get this bearing to last any length of time you will need to fit a return spring and return stop on the clutch actuating arm. The bearing will only last a couple of years if it is allowed to run in constant contact with the clutch cover.

Les.

[SGN]

Cheers Les, Thanks for heads up.

Steve

[Richard G]

This may be the answer to the issue I posted a few weeks ago. I bought a Borg Beck clutch package with Thrust Bearing, which was 3mm slimmer than old one. I bought a "heavy duty" thrust which was thicker, same as original. I have not run it yet but think I will fit a strong spring on release rod.

Gent's
Just be aware that this bearing KYK RCT52S is not rated as a constant contact bearing unlike the original stag fitment, it is sold as a heavy duty replacement for the TR5/6 and stag. The bearing is original fitment on the Toyota Land Cruiser. To get this bearing to last any length of time you will need to fit a return spring and return stop on the clutch actuating arm. The bearing will only last a couple of years if it is allowed to run in constant contact with the clutch cover.

Les.

[les M]

Richard
You will not need a "strong" return spring if you do fit one without fitting a stop plate/arm then you will end up with no clutch at all as the spring will push the clutch slave cylinder back in the slave bore. What is needed is a spring that will pull the actuating arm/slave cylinder rod back onto a stop plate/arm that needs to be made and fitted. You only need to pull the arm back so that the thrust bearing is not in contact with the clutch cover, approx 1mm is quite sufficient. The stop plate needs to be adjustable to allow for wear of the clutch friction plate.

Les.

[Richard G]

Thanks for info, logical when I think about it! Will set about making a bracket.

RG

Richard
You will not need a "strong" return spring if you do fit one without fitting a stop plate/arm then you will end up with no clutch at all as the spring will push the clutch slave cylinder back in the slave bore. What is needed is a spring that will pull the actuating arm/slave cylinder rod back onto a stop plate/arm that needs to be made and fitted. You only need to pull the arm back so that the thrust bearing is not in contact with the clutch cover, approx 1mm is quite sufficient. The stop plate needs to be adjustable to allow for wear of the clutch friction plate.

Les.

[GDPR]

Or use the return spring and the adjustable clutch pushrod that is available for the TRs as an aftermarket fitment.

You can then use the slave piston as the end stop by bottoming it out in the cylinder and adjusting out the pushrod to give the clearance.

Russ

[nib]

Interesting as I'm having trouble with my clutch fitted with a Koyo release bearing, l've got four washers and s/c pushrod on top setting to get a workable clutch.