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Triumph Torque    Cars    Herald/Vitesse  ›  Clutch biting point
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Clutch biting point Print
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mazfg
March 19, 2017, 6:02pm Report to Moderator


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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?


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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daver clasper
March 19, 2017, 8:41pm Report to Moderator
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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  
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mazfg
March 19, 2017, 9:57pm Report to Moderator


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The clutch is fairly new..so can't be wear


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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cliftyhanger
March 20, 2017, 6:27am Report to Moderator

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There was something about some new clutches being a bit thin...can't find the post now though...
That could be the issue?


Clive Senior

Location-Brighton, East Sussex
Foxy is here, 1500od tax exempt Toledo. Now has the decent engine back in Slant 4 engine bolted in, sprint box and axle.Now has fresh MoT. Needs paint though.
Spitfire Zetec project is started work progressing slooooowly on the road!
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mazfg
March 20, 2017, 7:43am Report to Moderator


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This was new old stock..so was hoping that might not be the case.. ?


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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glang
March 20, 2017, 12:11pm Report to Moderator

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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....
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esxefi
March 20, 2017, 1:26pm Report to Moderator

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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.
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glang
March 20, 2017, 1:56pm Report to Moderator

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Esxefi I thought same as you until I drew the complete slave cylinder/clutch arrangement then found high pedal point is worn clutch.
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mazfg
March 20, 2017, 2:05pm Report to Moderator


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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



Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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davidb5964
March 20, 2017, 4:17pm Report to Moderator

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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
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Nick Jones
March 20, 2017, 5:00pm Report to Moderator

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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


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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mazfg
March 20, 2017, 5:34pm Report to Moderator


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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...


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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Pete Lewis
March 20, 2017, 8:45pm Report to Moderator

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A diaphragm   clutch has a thinner disc than a coil cover , that  would give a high worn effect bite
If 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


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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Pete Lewis
March 21, 2017, 1:28pm Report to Moderator

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6cyl  coil cover disc should be 0.33" (8.38mm)  as new    nipped in a vice to just compress the wavy plates within the linings

diaphragm 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


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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