David Mirylees Posted September 21, 2011 Share Posted September 21, 2011 OK, I'm getting old and the memory's failing and I should know this but... I have just fitted a new (rebuilt) gearbox and all of the clutch paraphernalia. When driving the car I can hear a sound - rather like a straight cut gear noise - when the loud pedal is relaxed. The noise disappears when the clutch pedal is depressed. Question is, when you depress the clutch pedal is it only the clutch plate that is free of the flywheel or also the first motion shaft? Or, when the car is moving and in gear and the clutch is depressed, does the gearbox effectively still rotate being driven by the rear wheels? Is the noise therefore gearbox or clutch? Cheers, david. Link to comment Share on other sites More sharing options...
Exmog Posted September 21, 2011 Share Posted September 21, 2011 try tightening the clutch cable slightly. that is if your car uses a cable. Link to comment Share on other sites More sharing options...
Revin Kevin Posted September 21, 2011 Share Posted September 21, 2011 David, The output shaft rotates with the driven wheels. The first motion shaft (input shaft) and the layshaft and associated components are attached to the clutch plate. When the relevant gear is selected the appropriate syncro hub locks the gear to the output shaft, unless it is a direct gear then the first motion and out put shaft are locked together. When the clutch pedal is depressed the clutch plate is disconnected from the clutch cover and flywheel. Although internal frictions of the box will cause the out put shaft to turn with the input shaft when not in gear if the is no force applied to the output shaft. Hope you can understand my drivel and that this helps. Cheers Chris Link to comment Share on other sites More sharing options...
David Mirylees Posted September 21, 2011 Author Share Posted September 21, 2011 The output shaft rotates with the driven wheels. Understood The first motion shaft (input shaft) and the layshaft and associated components are attached to the clutch plate. Understood When the relevant gear is selected the appropriate syncro hub locks the gear to the output shaft, unless it is a direct gear then the first motion and out put shaft are locked together. Understood When the clutch pedal is depressed the clutch plate is disconnected from the clutch cover and flywheel. Understood Although internal frictions of the box will cause the out put shaft to turn with the input shaft when not in gear if the is no force applied to the output shaft. Understood ------- But if the box is in gear and the car is in motion, will the internals of the box still rotate (as they presumably are still meshed and driven by the motion of the rear wheels) when the clutch is depressed? Link to comment Share on other sites More sharing options...
ECR Posted September 22, 2011 Share Posted September 22, 2011 Yes Link to comment Share on other sites More sharing options...
Johnty Lyons Posted September 22, 2011 Share Posted September 22, 2011 Wot he said plus the driven plate will be spinning between the pressure plate and the flywheel depressing the clutch just opens the sandwich and releases the meat [if you'll pardon my description] Thats why on down changes you blip the throttle to spin up the sandwich before it grips the meat preventing that jerk you get when your sitting beside the wife. [Drives me mad] Link to comment Share on other sites More sharing options...
David Mirylees Posted September 22, 2011 Author Share Posted September 22, 2011 Thanks chaps - it would therefore appear that the "straight cut" noise is actually clutch generated. I take on-board the comment about the clutch cable and I'll pull it up a tad. I also see on previous posts that the CRB nowadays wants to be kept in contact with the housing fingers. Any ideas on how to get a decent pre-load on a 1988 chassied car? (old type with no pedal box housing/cover) cheers Link to comment Share on other sites More sharing options...
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