Nismo Slave Cylinder Install

[BstewyR33]

Hey all, I'm new to the whole skyline thing (as you can prob gather from my post count ) but i've hit a bit of a perverbial brick wall when it comes to the install i've done and i thought you skyline guru's might be able to help.

bascially when i got my car (S1 R33 GTST) i noticed that the clutch was a bit too heavy for stop start driving that i do to and from work each day (i know man up right. but with my genetics wont be long before i need a knee op hehe)

so i decided to purchase a Nismo Big Slave cylinder and fit it myself. i took the old one off (didnt pinch the hose that the slave connects to) but i managed to get the new slave on without too much oil spilling out. tried to bleed the system, but that seemed to take forever and i was getting nowhere fast. basically not doing the bleed process quick enough.

so with the old man, we decided to do a reverse bleed by pushing the fluid up through the nipple on the slave cylinder to ensure that no air was in the system (after reading many of the posts saying the air travels up the system etc etc). however when we did a bleed on the system, only a little bit of fluid trickled out of the slave nipple. - have i not bled it for long enough?

I had a quick read over Big Zil posts (i think that is what his name was) and he seemed to have a similar situation on his R33 GTR - however he said that he got pressure back in his clutch but it stuck. however after turning his car on and pumping his clutch by hand approx 30 odd times his pedal feel went back to normal.

My problem is i just tried this method thinking it seemed logical that when the car was turned on the vacuum pressure would start. however it didnt work (even after around 100 odd pumps of the pedal)

so i throw the question out to you lot, have i not bled the system properly, have i stuffed up my clutch master cylinder, do i need to take out the junction box so the master has a more direct path to the slave

so basically its taken me and my old man the better part of 6 hrs trying to get my clutch back

any help would be greatly appreciated

Cheers

Ben

[T-Rex]

If only a little bit of fluid comes out when you depress the clutch i'd say there is still air in the system. Generally you should have a good squirt of fluid (say 50-100mm at least) when you depress the clutch.. Having only owned a skyline for 1 month or so i cant help with any special ways to do it, but all systems are similar. Anywhere air can be trapped, it will be trapped.

[blind_elk]

AFAIK, the GT-R has a vacuum booster, similar to the booster on the brakes, GTSt doesn't.

Now, you have to bleed the master first. If you have any air in the master, you will be wasting your time with the rest of it.

The heaviness of the clutch is probably because there is a heavy duty clutch pressure plate installed.

[BstewyR33]

we havent tried bleeding the master with all the fluid in it. - prob why we are getting nowhere quick (if its not a master cylinder problem)

i'm hearing alot of things about a seal in the master cylinder, is that just the rubber gromet on the lid to form an air tight seal? or is there a rubber diaphram inside the master that creates a suction??

Cheers for the tip

[BstewyR33]

one problem fixed another arises

managed to do a proper bleed on the clutch system however now the slave cylinder has failed - oil is getting into the rubber bellow of the slave so i think the piston o-rings has failed meaning either a rebuild or brand new one

kinda pisses me off cuz it was a brand new slave that i brought originally but atleast i managed to get it working for a short period

thanks for all the tips and ideas

[Duncan]

too late for you know, and I'm not sure if the 33 setup is the same....

in the 32 nissan decided to add a "damper" and cooler assembly to the clutch line, it is a block and then big loop of pipe towards the back of the car. There is a second bleed nipple on there that you may need to pleed as well. It also means the system takes much more fluid than you would normally expect. The whole setup is commonly replaced by direct braided line run

[Swiper the Fox]

too late for you know, and I'm not sure if the 33 setup is the same....

in the 32 nissan decided to add a "damper" and cooler assembly to the clutch line, it is a block and then big loop of pipe towards the back of the car. There is a second bleed nipple on there that you may need to pleed as well. It also means the system takes much more fluid than you would normally expect. The whole setup is commonly replaced by direct braided line run

[mitchy_]

too late for you know, and I'm not sure if the 33 setup is the same....

in the 32 nissan decided to add a "damper" and cooler assembly to the clutch line, it is a block and then big loop of pipe towards the back of the car. There is a second bleed nipple on there that you may need to pleed as well. It also means the system takes much more fluid than you would normally expect. The whole setup is commonly replaced by direct braided line run

yep, the 33 does have the block with the second bleed nippe and extra lines for the clutch

[BstewyR33]

yeah its got one of the junciton box's - we sort of have the situation under control (minus the fact that my brand new slave has to be rebuilt cuz the o-rings inside have failed)

Cheers all for the help!