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R32 Clutch Issue, Rb25 Gearbox Rb20 Motor

sean133
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sean133 Proficient

sean133

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Got a clutch engaging issue lads

Installed a good condition rb25 box that came out a car I wrecked

Basically got it done and car could be put into all gears but it wouldn't move

Sussed it out to be a stuck slave cylinder so replaced that with new oem item (everything seemed to lead to this)

Because we took the slave out, fiddled with the pin and put it back in and the car would drive as it should for like 10 seconds then get stuck again

So I bought a new slave but it didn't fix the issue ....

We put the rear on jack stands and took the slave off and the wheels spun in first as they should, speeding up with the revs of the car going up

Clutch slave back on and it'd do the same

On the ground the car would move when you put it in gear, but when foot went on the throttle nothing happened

At 4000ish rpm the car kinda moved a bit which seems like the clutch is slipping

But I drove with this clutch before the box change, and it had plenty of meat left otherwise I would have replaced it

New oem slave, new gktech braided clutch line, bled properly.

Fiddled with the adjustment on the clutch pedal but it didn't change anything

I understand that many people will just say " clutch is gone"

But how?

Basically the issue seems to be either the clutch is slipping which I don't believe

Or the clutch fork isn't retracting properly ,

Is there a way the thrust bearing or carrier could not be going right back in ? Leaving the clutch still engaged a tiny bit so it won't go into gear fully?

Could pivot ball be affecting this?

Could it be a spigot bush issue?

It has a new thrust bearing, pivot ball was good, and the fork wasn't cracked, and I checked it moved nicely and as it should before the box went in.

Appreciate all help and constructive criticism or let me know if I should try something to diagnose further

Thanks guys

And yes I can just pull the box out but id like to diagnose as much as possible before I do it in case I don't need to.

Because I'd like to do drift prac on Saturday

sean133 Proficient

sean133

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I could smell something burning

It all leads to a slipping clutch I suppose

Only theory I could come up with is when the slave was seized and wouldn't fully engage the Clutch before , the clutch was basically worn down to nothing because of it, which kind of makes sense

sean133 Proficient

sean133

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  • Author
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For anyone wondering, the pivot ball in the rb25 gearbox was too long

Which is very weird because most people seem to just bolt the box up to a rb20 easy

Pivot ball being too long burnt the clutch out hence the smelling/slipping

Got a gktech sr20 one in there now just need to bolt it up and test it out , could possibly still be wrong just need to trial and error

blind_elk Grand Master

blind_elk

Posted
Posted

No trial and error about it. A few measurements - clutch height, throw-out bearing offset, and a couple of others - and you should be able to tell whether it all fits together correctly.

sean133 Proficient

sean133

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Could figure out where the clutch sits inside the box by measuring then figure out where the face of the bearing will sit at the furthest point the pressure plate is inside the box , then if the fork angle is ok after setting it up I'll know it will work

Just weird it ever happened, no one else seems to have had the issue

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