Car keeps blowing slave cylinders out, absolutely stumped *PICS*

[TrustS13]

** RESOLUTION: Always use the provided throw-out bearing that comes with your clutch kit. The problem was that I was attempting to use an OEM Nissan TOB with my SPEC clutch kit. The OEM Nissan TOB was much smaller than the provided SPEC TOB, which caused my slave to extend to the point of blow-out each time I attempted to bleed the clutch.

Switched in the SPEC provided TOB and everything was gravy until the day I sold the motor **

Hi guys,

I am at a standstill in my build of my new hatch. The car keeps blowing out slave cylinders. I've gone through 4 AutoZone and 1 OEM that came with my S14 swap. Here are some details:

Car: 1991 240SX OEM 5 Spd car
Car did move and run, but previous owner complained he had a hard time bleeding the clutch (This was with stock OEM line, but his master cylinder wasn't adjusted right). I put in the S14 SR but it hasn't moved yet. Car is running however.
Motor: S14 SR20DET
Transmission: Stock - has new Circuit Sport pivot ball (old broke), Stock throw out bearing
Flywheel: Stock, resurfaced 0 miles
Clutch: Spec Stage 3 6 puck 0 miles
Throw Out Bearing: Stock, regreased
Input Shaft: regreasted
Pedal: Replaced pedal from my last shell
Master Cylinder: Brand new 0 miles from AutoZone (adjusted pedal properly)
Slave Cylinder: Blown 5 now
Clutch Line: Circuit Sport

I have replaced nearly every part in the clutch system as you can see. My first problem was that the pivot ball was broke on my swap. A quick call to Enjuku and I had a new circuit sport pivot ball. Installed it, threw the trans back on, and re-bled the system. It builds up pressure fine, and squirts out fluid like it should. Just went it seems to be fine, we go to bleed it 1 more time, and the slave releases no fluid or hardly a drip. When this happens, I always know it's about to blow. I close it, and my buddy starts to pump the clutch again, and then he says it looses all pedal feel. Next thing you know, fluids leaking all out of the slave. The seal on the piston in the slave has literally blown apart and the slave is now ruined.

I've gone through 5 slave cylinders, replaced the master, slave, pedal, pivot ball, and the hard line on this car.. I'm stumped and about to give up.

When I had the trans off, the shift fork didn't appear bent at all. I regreased the input shaft and TOB and put it all back together. The only thing I can think at this point is if the Circuit Sport line is causing it to blow out? Should I try a 1 man bleeder tool? The process for bleeding we are using is like you would do on any other car.

1. Pump and hold pedal to floor
2. Open bleeder, close
3. Pump and hold pedal to floor
3. Open bleeder, close.. etc.

We are getting pedal feel, we took the boot off and can see the TOB engaging the PP and the whole system working, but its like the slaves are building up too much pressure and somehow blowing out the seal. It's insane, I've NEVER had a car do this.

Either way, here are some pictures:







Any and all input would be greatly appreciated.. I'm running low on ideas. I have a local shop I could have re-create a 1 piece line, but a larger size? I don't have a OEM line, but I could try and source one (I threw mine away )

I would post this in tech, but I know it's gone missing. Thanks in advance.

Danny