RPS Max Street Clutch Problem

[nissandr1ft]

I put the clutch in about a month ago, and immediately I noticed that it has a VERY long engagement. I had to adjust out all free play at the top, and it still started engagement at the floor. The clutch slave was replaced with the clutch, and everything is bled well. It was alright, but now that Ive driven it a little while its worse. If I lay into the throttle, and run it through the revs, the clutch isn't completely disengaging. For the next few times shifting it wont completely disengage either, and makes shifting tough. Is this a known problem with them? I tried another slave, and the engagement points are the same. Could my master cylinder be leaking, and not allowing the pressure to build enough, or is it something else?

[nissandr1ft]

I got a few responses on FA about this, and they say its a common problem with the RPS clutches. Would it be a good idea to adjust the pedal even more so the rod is actually keeping pressure on the master cylinder...this way it would allow it fully disengage. It's still N/A KA, and doesnt slip at full throttle with the clutch pressed in about 1-2" in 4th. Currently though with the clutch flat on the floor after a WOT run... you can hear a little chatter from the clutch being slightly engaged.

[az_240]

Sounds like your master cylinder needs to be adjusted or replaced.

[nissandr1ft]

It's adjusted about as far as I can adjust it...roughly 1/4 left of threads on that adjustor. I could not get it adjusted any farther out since it was getting tough to turn since there was tension on that.

[az_240]

When I replaced my master cylinder the fork that was on the master cylinder was not the right one..... it was clearly too short.

I swapped forks with my old master cylinder and everything was good after that.

check the clutch pedal freeplay and clutch pedal height.

[nissandr1ft]

well the problem just got worse... I went to lunch and the clutch wont disengage. With less than 0 freeplay... the adjustment was turned when there was tension on it. The clutch isnt disengaging... I had to cut the car off, and start in gear at stop lights. So now it looks like fluid pressure problem, it doesnt seem to help pumping it, so does that mean master cylinder problem?

[az_240]

Check the fluid in your master cylinder.... I bet its empty

More than likely your clutch line that goes to the slave cylinder is leaking.

Pour some brake fluid into the clutch master cylinder and have someone pump the clutch while your under the car watching that soft line for leaks.

If the soft line is good check your clutch pedal for fluid.... your master cylinder could be leaking.

[nissandr1ft]

I checked it on the way back into work, and it was full. I don't see any leaking anywhere on the master, but haven't checked the slave since its been raining.

[slider2828]

There is an additional adjustment in the firewall right inforamtion of the booster. Its a little cap screw thing that you can turn in and out, my thinking is turn it out, because you aren't pushing the clutch master cylinder diaphram far enough....

[slider2828]

I have one of these clutches no problem as you have specified.

[nissandr1ft]

Why would it get worse overtime though? Ill check it out, and see what I can figure out.

[slider2828]

Because you are riding on your clutch all the time and obviously its going to wear...

[sTalnOut]

i had the same problem when i had my s13 , the only thing i remember was the clutch lines leaking and master cyl. i changed them all since it was old anyways and everything was fine, if not maybe have a real good mechanic to take a look at it for you so you wont have to stress anymore =)

[nissandr1ft]

Well I do my own work... I just don't want to buy unnecessary parts. I figured once it got worse tonight that it was master or slave, and that every time a slave has died on me you could pump it up, or it died completely. I ended up adjusting as much as possible with that rod, and it went into gear once right. From that point on it wouldn't even come close to disengaging. My guess is that the advanced master cylinder just wouldnt hold the pressure of a HD pressure plate.

[nissandr1ft]

I'm looking at courtesy parts at the slave cylinders, and see that they offer a few sizes on the slave cylinder... 11/16, and 3/4. If Im thinking correctly the smaller piston of the 11/16" would take less fluid to displace the piston. If thats the case the clutch fork would move more with less movement of the clutch pedal. I also noticed all S13 had a 5/8 clutch master, while it did not give piston size for the S14.

[nissandr1ft]

Update:

I ended up putting a master and slave cylinder on last night, bled it, and made sure the slave is working correctly. I put an 11/16 slave on, its moving ~2 inches, and the pedal feels right. I tryed to take it for a test drive, and the first time I could put it into gear sitting still, but after that it wouldnt fully disengage. I'm guessing that means Ill have to drop the tranny, and tells me its either a bent fork or a bad pressure plate. Are there any other options, or suggestions?

[nissandr1ft]

After reading a few responses... I wonder if the term disengage is the right term. The clutch never slips at all, when the clutch is to the floor...the car still moves.

[nissandr1ft]

I just ordered a Nismo Pivot if that's broken, but is there anything else to check while the transmission is dropped... I don't want to put it back up to find that the problem is still there. I have the 240sx throwout, but I've been hearing that the Z32/96+ S14 Throwout works better with aftermarket clutches.

[nissandr1ft]

Update:

Clutch is out, everything looks like it should, and Im stumped. The disk looks fine since its not missing any springs, and the surface looks fine. The pressure plate seems to look fine, and springs all feel fine. The pivot ball is fine, and the fork is straight. The throwout bearing spins freely, and structurally looks sound. Ill get some pictures tonight, and see if anyone notices something wrong.

[nissandr1ft]

Pictures:

http://i77.photobucket.com/albums/j43/nissandrift/Clutch021.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch026.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch030.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch033.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch037.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch040.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch041.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch042.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch043.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch045.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch047.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch048.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch049.jpg

[nissandr1ft]

I did notice almost immediately when bolting the pressure plate on that the springs caught quickly. Usually on the previous clutches the springs didn't move until the last little but of tightening, where as these did pretty much did as soon as the bolts caught thread.

[nissandr1ft]

Well I talked with phase2, and RPS about it. They wanted me to throw it back in to make sure it wasn't a fluke. I took pictures of all the steps... anything look out of place? The clutch still doesn't want to disengage with the pedal to the floor.

http://i77.photobucket.com/albums/j43/nissandrift/Clutch078.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch079.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch085.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch087.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch088.jpg
http://i77.photobucket.com/albums/j43/nissandrift/Clutch090.jpg

[nissandr1ft]

Here are 2 vids I made... not great, but it should give an idea.

Clutch Slave in action:
http://i77.photobucket.com/albums/j43/nissandrift/th_Clutch092.jpg (http://s77.photobucket.com/albums/j43/nissandrift/?action=view&current=Clutch092.flv)

Wheel moving in gear w/ pedal to the floor:
http://i77.photobucket.com/albums/j43/nissandrift/th_Clutch095.jpg (http://s77.photobucket.com/albums/j43/nissandrift/?action=view&current=Clutch095.flv)

...I'll try to gt some more video in the daylight, but this is all I have for now.