Dont Know If My Clutch And Gearbox Is On Right?

[dantheman88]

I recently put my rb20 gearbox and clutch on my rb25 and put the engine back in and now have just put my clutch slave on and tried to put the brake fluid through it using the DIY on here (bleeding the air out of each section)

now I think I have done it right but my clutch pedal still doesnt have any pressure. I dont know how much movement the fork is supposed to have but when I put the slave on I had to compress the pin on it to get it in between the fork and where it sits. The only movement I can get on the fork is by by pushing it into the slave which pushes the slave pin in even more. Is it supposed to have more movement then that?

I could hear when I push the fork into the slave when the clutch pedal is down it makes the clutch pedal jump.

Another thing I notcied is that its hard to get the gears into place but Im not sure if thats because the gearbox doesnt have any oil in it. Would this cause this? or has something gone wrong with my clutch fork when my clutch went on?

Or have I just put the fluid in wrong?

This is how my slave sits normally. The fork cannot move backwards at all. is this normal?

[Tommy Kaira RL]

Have you got the right slave. I changed my rb20det gearbox to a rb25det and I had to change the slave.

Try adjusting the nut at the top of your clutch pedal where it pushes the rod into the master.

[dantheman88]

Yeh I have the right slave. Im using a rb20 box. The rb20 uses a push clutch which means the slave pin should be able to push the clutch fork right??? If so I think something has gone when I have put the clutch and box on cos I cant push the fork at all. it will only move towards the slave, and isnt the slave supposed to push it??

[dantheman88]

gone wrong I mean. I am starting to think my box is going to have to come off again

[Tommy Kaira RL]

Yes the slave should push the arm. I would suggest taking the slave off the side of the gearbox and see if it moves with out the arm in the way. That way you will know if its clutch or hydrolics.

If its not the hydrolics then look at the pivot ball. Possibly a different clutch might sit further out so the fulcrum angle will change.

[dantheman88]

Thanks Ducati, I will try taking it off when i get home in a couple hours and see if it moves without the fork in the way. The fork definantly has no backward movement so maybe something with the pivot ball or thrust bearing has gone wrong

[dantheman88]

I tested the slave and it is fine. I took the gearbox off and when I moved it off a bit the clutch fork was able to move fine, but when its moved back on the fork cant move backwards at all. It feels like the clutch cover is too big or something for the bearing to move forward.

Is the rb20 and rb25 clutch cover different?

I was thinking maybe I have a rb25 one? cos the 20 and 25 clutches are the same as far as I know

[bubba]

20 one will work if it's a 20 gearbox. The difference between RB20 and RB25 (R33 era) is the bolts are on the other side of the slave. R34 GTT and late 32GTR onwards went to pull type clutch.

Have you tried cracking the bleed nipple on the slave and getting some fluid through? Probably got a huge air lock.. there's also a bleed nipple on the master cylinder.

[dantheman88]

Yeh I did the whole process of bleeding th air out of each section for the slave. It's just that the slave needs the pin pushed in a fair way just to get it in place (shown

In the pic in my first post) and the fork has absolutely no backward movement even If I tap it with a hammer.

That's what's made me think that I may have a rb25 clutch cover if they are bigger then rb20 ones??? Cos that may explain why my fork can't move. What do you reckon?

And I just remembered my clutch cover didn't line up to the pins on my flywheel and I had to drill the holes out a bit on the cover to make it go on which I found a bit strange

Edited July 18, 2011 by dantheman88

[dantheman88]

By the looks of this site the rb20 and rb25 pressure plates are the same. And according to the site I definantly have a turbo pressure plate and flywheel so Now i have no clue what the problem could be

http://www.skylineowners.com/forum/showthread.php?t=151491

[ido09s]

your not trying to push the clutch fork with your hand are you as there is no way in hell you will move it.

I would say you just havent bled it properly. Even if its the wrong cylinder it would still move, it just wouldnt move enough to get gears thats all.

If it doesnt move at all, ie by pushing the clutch fork with a pry bar, by operating the clutch through the pedal, then you have something wrong inside the bell housing.

Why are you using a 20 box on a 25 anyway? I hope your not a crazy driver as ist not going to last long

[dantheman88]

Well i have tried tapping it with a hammer and using a pry bar and couldnt get any movement. I am not 100% if it bled right as I have never done it before. But i didnt follow the instructions on here and I still couldnt get my clutch pedal to get pressure. but I thought that may have been becasue my slave pin was compressed so much.

I am using a rb20 box as thats what came with my project. I have an aftermarket clutch, but I still have a stock pressure plate and flywheel. Could the stock flywheel with an aftermarket clutch be causing the fork not to move?

I know the rb20 box isnt very strong but i wasnt planning to go very hard on it until I could get a rb25 box

[Tommy Kaira RL]

I swaped a rb20 box for a rb25 box and found the slave cylinder were different. I also had no pedal feel at first when I changed to a rb25box. The clutch and flywheel where all the same. After I bled it I still had no pedal feel. In the end I had to adjust the nut and pin that went into the master at the top of the clutch pedal. Wind the pin in until it hits the cyliner.

Has your pedal any pressure or does it feel like its not even pushing the master pin in?

[dantheman88]

I found that the hard line from the master wasn't done up very tight and was leaking a little. So I tightened it and now the clutch pedal Has some pressure and pushes the fork, but it doesn't feel quite normal yet. It feels loose until it jut about hits the floor, then gets pressure a little. I'm not sure if I need to adjust the clutch or try bleeding out any air again

[ido09s]

bleed it again and if that doesnt fix it look elsewhere.

If the line was lose there is a chance it now has air in the system