jimcwestie Posted July 31, 2020 Report Share Posted July 31, 2020 My 1969 TR6 started making a rattling knocking sound when the clutch is pressed. On Monday removed the gearbox and clutch. I found the tapered pin holding the fork onto the cross shaft was broken, but still in place causing a small amount of movement. The conclusion I reached this was the problem. I have now replaced the following parts, clutch kit, release bearing, carrier, cross shaft, fork and taper pin. After having completed this job I have found I have made no progress and the clutch still sounds the same when the pedal is pressed. Any advice and guidance would be much appreciated. Thanks Jim Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 31, 2020 Report Share Posted July 31, 2020 Crank shaft end float? Peter W Quote Link to post Share on other sites
John L Posted July 31, 2020 Report Share Posted July 31, 2020 Have you fitted the dowel bolts in the gearbox engine flange? Did you change the cross shaft bushes? When you depress the clutch can you select reverse without crunching? It may be the clutch is not opening enough with wear on the pedal and master cylinder push rod perhaps. Perhaps it could be the gearbox snout that is not correct, Roger on here had a new one that was dimensionally wrong. Has it always made the noise? John Quote Link to post Share on other sites
jimcwestie Posted July 31, 2020 Author Report Share Posted July 31, 2020 It has had the clutch slave and master cylinder were replaced a few months ago. There is no wear on the cross shaft bushes or the push rods. Jim Quote Link to post Share on other sites
Waldi Posted July 31, 2020 Report Share Posted July 31, 2020 Did the starting of the noise commence after changing those? If not, I hope for you it’s not the axial (thrust) bearings on the crankshaft, I would check that first. Did you note there is a small bronze bush in the flywheel and did it have a proper sliding fit? Re the tapered pin: it is a good practice to install a roll pin additionally to the tapered pin in the fork. A Google search will lead you to that info. A “must” when you remove the GB again. Quote Link to post Share on other sites
jimcwestie Posted July 31, 2020 Author Report Share Posted July 31, 2020 It was making the noise before I replaced all the parts. I did not replace the bush in the flywheel. The engine is running well and sounds great. Will have a check for any end float. Thanks Jim Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 31, 2020 Report Share Posted July 31, 2020 (edited) 59 minutes ago, jimcwestie said: It was making the noise before I replaced all the parts. I did not replace the bush in the flywheel. The engine is running well and sounds great. Will have a check for any end float. Thanks Jim Simple to check. Engine stopped. Tyre lever on the front pulley and lever/push against the chassis or cross tube. You will see and hear the Clonk if there is too much. Spec 0.004-0.006”. I think. Peter W Edited July 31, 2020 by BlueTR3A-5EKT Quote Link to post Share on other sites
jimcwestie Posted July 31, 2020 Author Report Share Posted July 31, 2020 Many thanks and I do have end float on the crankshaft. I have taken the sump off and found two thrust washers lying there. Pleased to have found the cause of the problem. Thanks Jim Quote Link to post Share on other sites
Waldi Posted July 31, 2020 Report Share Posted July 31, 2020 Good you inspected that. Now hope the wear has not affected the bearing cap/engine casing. Waldi Quote Link to post Share on other sites
Nigel Triumph Posted July 31, 2020 Report Share Posted July 31, 2020 1 hour ago, Waldi said: Good you inspected that. Now hope the wear has not affected the bearing cap/engine casing. Waldi Ditto that. If you've caught this early enough, fiddling new thrust washers into place (probably oversize now) and replacing the rear main bearing cap should solve the problem. Nigel Quote Link to post Share on other sites
jimcwestie Posted July 31, 2020 Author Report Share Posted July 31, 2020 The end cap looks fine and I cant see any damage. I have ordered a selection of thrust washers. Fingers crossed. Thanks Jim Quote Link to post Share on other sites
Waldi Posted July 31, 2020 Report Share Posted July 31, 2020 5 hours ago, BlueTR3A-5EKT said: Crank shaft end float? Peter W Trumps for Peter (again). Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.