mazfg Posted March 19, 2017 Share Posted March 19, 2017 As per my previosu post...I've just re-fitted my gearbox. I've just been out to test drive after refitting and noticed that the biting point of the clutch seems very high. I've just installed a new slave cylinder (7/8" bore) and the master is onyl a year old and in good condition. I also had a new clutch fitted last year. I haven't driven the car since September and only really noticed it in comparison to my daily run about. I can't see the clutch is worn as only done a few 100 since it was fitted and high biting point is usually that sign? Quote Link to comment Share on other sites More sharing options...
daver clasper Posted March 19, 2017 Share Posted March 19, 2017 Have heard a few times that I high biting point can mean wear.My clutch used to have a very low bite point and was crunching getting reverse sometimes. I moved the S/C forward 5mm or so with spacers and this gave a higher bite point and cured crunching.More recently I fitted a new M/C as seal kits didn't last long. I got a Landy one, as only £10 inc postage. Fits straight on, though is slightly bigger volume. Clutch needs bit more pressure and raised the biting point to now quite high.Just a few points, though maybe not relevant to yours.Dave Quote Link to comment Share on other sites More sharing options...
mazfg Posted March 19, 2017 Author Share Posted March 19, 2017 The clutch is fairly new..so can't be wear Quote Link to comment Share on other sites More sharing options...
Clive Posted March 20, 2017 Share Posted March 20, 2017 There was something about some new clutches being a bit thin...can't find the post now though...That could be the issue? Quote Link to comment Share on other sites More sharing options...
mazfg Posted March 20, 2017 Author Share Posted March 20, 2017 This was new old stock..so was hoping that might not be the case.. ? Quote Link to comment Share on other sites More sharing options...
glang Posted March 20, 2017 Share Posted March 20, 2017 my bite point has been affected quite a lot by recently replacing the engine thrust bearings and I reckon by mixing thicknesses you could adjust the position even further.... Quote Link to comment Share on other sites More sharing options...
esxefi Posted March 20, 2017 Share Posted March 20, 2017 it's normally the other way round that a low pedal bite point indicates a worn clutch.as the clutch wears the diaphragm spring fingers protrude out more so the release bearing has to travel slightly further to operate the clutch,(although in reality the clutch still disengages at the same rate we feel it as the spring has further to travel over centre)we are only talking millimetres but it is felt much more at the pedal due to the fluid transfer ratio from m/cylinder to s/cyl. Quote Link to comment Share on other sites More sharing options...
glang Posted March 20, 2017 Share Posted March 20, 2017 Esxefi I thought same as you until I drew the complete slave cylinder/clutch arrangement then found high pedal point is worn clutch. Quote Link to comment Share on other sites More sharing options...
mazfg Posted March 20, 2017 Author Share Posted March 20, 2017 Quoted from esxefi it's normally the other way round that a low pedal bite point indicates a worn clutch.as the clutch wears the diaphragm spring fingers protrude out more so the release bearing has to travel slightly further to operate the clutch,(although in reality the clutch still disengages at the same rate we feel it as the spring has further to travel over centre)we are only talking millimetres but it is felt much more at the pedal due to the fluid transfer ratio from m/cylinder to s/cyl. Usually high point is a worn clutch.Mine uses the earlier spring type clutch arrangement Quote Link to comment Share on other sites More sharing options...
davidb5964 Posted March 20, 2017 Share Posted March 20, 2017 Hiya A worn driven plate will make the fingers of the d/spring move upwards towards the gearbox, a worn fulcrum on the cast iron pressure plate sends them the other way, believe me I measure them every day !00 miles me thinks it cannot be worn.I would check that the thrust bearing has little pressure on the fingers in its released condition ensuring the master cylinder is returned condition to its Regs Dave Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted March 20, 2017 Share Posted March 20, 2017 Quoted from cliftyhanger There was something about some new clutches being a bit thin...can't find the post now though...That could be the issue? It's the release bearing which is thin I think rather than anything else.Nick Quote Link to comment Share on other sites More sharing options...
mazfg Posted March 20, 2017 Author Share Posted March 20, 2017 Quoted from Nick Jones It's the release bearing which is thin I think rather than anything else.Nick A nice thought but mines NOS... Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 20, 2017 Share Posted March 20, 2017 A diaphragm clutch has a thinner disc than a coil cover , that would give a high worn effect biteIf you have a coil cover and diaphragm disc .you need to nip the linings in a vice and measure its thickness the data is normally in the wsm under testing and setting using a metal packer to simulate the disc or innthe main specs for the clutch, sorry mine not accessible just now.the thin throw out bearings 15mm instead of 19mm is vitesse gt6 6cly. Not 4 cyl.pete Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 21, 2017 Share Posted March 21, 2017 6cyl coil cover disc should be 0.33" (8.38mm) as new nipped in a vice to just compress the wavy plates within the liningsdiaphragm disc is 0.29" ( 7.36mm)so if you have a thin disc and thin bearing the geometry of the levers and fingers will be way out Pete Quote Link to comment Share on other sites More sharing options...
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