installed twins now just grind grind grind

[monterx7]

i installed a twin plate os giken clutch/flywheel and now my gearbox will not go in gear with the motor running.  with motor turned off it will go into all the gears, issue is just with motor running.  ive been dealing with this for some time now, and honestly have no idea whats wrong.  the following are things ive done or checked during the last few weeks(yes its been weeks:Hammer, work sucks:Laugh):
 
- replaced release bearing and pilot bearing
- bled master/slave cylinders
- adjusted clutch pedal
- triple checked clutch plates arrangment
- spacer betw slave cylinder and clutch folk for more throw...no luck
 
from what i can remember, this is everything ive done so far and still have the same issue.  what am i missing
 
 
any help will be much appreciated
thanks

[dthebuk]

no idea what it may be. you could always look through the check plate whilst someone operates the clutch to see what happens?
no too clued up on twin plates

[Archbish]

has the clutch definitely, definitely been put in the right way round?  Sounds stupid, but seen it done, and similar symptoms...

[Prof]

Could also be pilot bearing - that happened to me - and the symptoms are just as you describe
 
If it is that, then the clutch has to come off again to get at the pilot bearing, plus they\'ll need a puller to get it out. The part itself is fairly cheap - but it\'s a pain to find out after the clutch swap
 
Did your twin plate clutch kit need a spacer or special clutch fork - as some of the twin units are right on the limit on the clutch pedal with the stock fork ?
 
Just noted that you\'ve replaced pilot and also have a spacer - doh - obviously not these then...

[Prof]

Just had a thought - does it need a standard release bearing - or a specific one?

[BlitzBoy]

probably wrong release bearing, ring OS Giken in this country for advice, RB Motorsport they can check the applications manual

[Prof]

Typically - it\'s listed as optional for FC3S, and appears to be a stronger bearing than stock, and the fork is also optional:
 
http://www.osgiken.net/products/racingmultiplate.html

[Prof]

Over on RX7 club, apparently stock Release bearing should work:
 
http://www.rx7club.com/showthread.php?t=282729

[BlitzBoy]

So if you can use the stock release bearing this would then point to either the Master or Slave cylinder being faulty , eg leaking past the primary seal in the piston, therefore the Slave cylinder Rod not having enough force to activate the fork to push against the pressure plate springs

[steve garbutt]

Pump the clutch pedal fast to see if you can engage a gear, if you can then its more than likely the clutch slave cylinder.
Also peal the rubber back on the slave, if you find fluid then it more than likely needs replacing.

[pdtaylor18]

make sure the forks are not bent as this has been the cause of many a TII issue with gear selection.  try adjusting the rod under the dash at the foot pedal and make sure that its setup correctly, it may well need just that little bit more in length (don\'t we all Lol) but if the pedal looks like its fairly inline with the brake then maybe not that but Mazda manual does have dimensions from floor to pedal for the clutch.

[monterx7]

thanks for all the help everyone.


im using a stocker release bearing currently.  as we found out, alot of rx7club claim this clutch and the twins work good together.  

i pulled the gearbox again on sat to make sure the pilot bearing was still good to go, and is.  clutch fork seems to be not damaged.  

was also thinking of changing the slave cylinder.  will order one tonight.  clive at mazdarotaryparts probably the best to get this?


thanks

[TiddlesRX7]

Either that or ebay usa. I found that I could get both master and slave cylinder from there delivered for not much more than just the slave over here. Plus its always worth changing both if one is causing problems. They are 20yrs old or so now.

[monterx7]

i normally order from mazdatrix but trying to get this thing running again for sunday.  i changed both before, so they are about 8 yrs old...but old enough to fail

[1990_fc3s_t2]

If you changed both before i would think they should be good even after 8 years, as suggested id pull back the rubber boots and see if any fluids leaking out also the colour of the fluid in the reservoir darker usually means perished seals.