clutch pedal pressure raises out of no where, clutch slipping? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

S13-KA24DET · 06-15-2007, 01:00 AM

clutch pedal pressure raises out of no where, clutch slipping?
.
r33 rb26dett & tranny
stock clutch
intake
straight piping yada yada
15 psi
.
when i first got her running of course i'd do a couple runs, mostly rolling/2-3rd gear pulls if that matters, the clutch/clutch pedal worked fine *but the rod was adjusted 'all the way out' i know it's usually not supposed to be adjusted all the way but it worked and it would grab about after half way out so i assume my clutch would still grab nicely without the slave pushing it..
.
then my ricer self warmed up my tires and then i ran and my clutch was slipping the whole time and afterwards the pedal out of no where has no play/has become pressurized or pressed up hard against the stopper, anyone care to explain why 'out of no where' it would just be like that? i adjusted it now with some free play but have yet to test it out (kinda late right now)

johngriff · 06-15-2007, 01:10 AM

it is passing air back and forth, and needs to be bled.

S13-KA24DET · 06-15-2007, 01:36 AM

hmm that's odd just cause i've drove it kinda hard for awhile and kept up nicely, care to explain/give me a better understand as how that might happen? or is it just one something that happens outta no where

orion::S14 · 06-15-2007, 09:05 AM

If the clutch rod is adjusted improperly (too little free play)...then it builds pressure, and cannot vent it...mainly when hot.

SO it's fine when you start driving...but as everything warms up...the line builds pressure and cannot vent it b/c you've adjusted the master cylinder to the point where fluid can enter the line, but cannot vent back to the reservoir.

Loosen the clutch rod behind the pedal. Sometimes only take a half turn...so adjust, drive. Adjust, drive...until it's good to go.

- Brian

contranication · 06-15-2007, 09:49 AM

You can also leak out a little air into your system from the hot fluid, any water and air that got absorbed before the system was closed... Make sure your fluid is at the right level. Try switching to a higher temp brake fluid and re-bleed your system if the above doesn't work.

*downshift_sideways* · 06-15-2007, 10:06 AM

I had the same problem.
I readjusted the rod, and bled my clutch out...

but it was too late lol...

nisans13turbo · 06-19-2007, 11:34 PM

Quote:

Originally Posted by orion::S14

If the clutch rod is adjusted improperly (too little free play)...then it builds pressure, and cannot vent it...mainly when hot.

SO it's fine when you start driving...but as everything warms up...the line builds pressure and cannot vent it b/c you've adjusted the master cylinder to the point where fluid can enter the line, but cannot vent back to the reservoir.

Loosen the clutch rod behind the pedal. Sometimes only take a half turn...so adjust, drive. Adjust, drive...until it's good to go.

- Brian

Hate to bring this old thread back but I having same problem, when adjusting the nut on the rod, do I move the rod out or inside my car? Can someone clarify this to me before i start adjusting. thanks

DJ_Sunrise · 06-20-2007, 05:46 AM

Check factory specs for dead zone on the clutch. For SR/KA its something around 1/2in on a properly bled system. If you are looking at the pedal from drivers seat, clockwise screws it in shortening pedal travel. Counter clockwise lengthens travel. RB trans on 240s im not sure if the dead zone should be the same, but more than likely.

-Bart

redgold · 06-20-2007, 04:39 PM

so if my clutch is grabbing too high, I should shorten the rod or make it longer?

:hammer:

johngriff · 06-20-2007, 04:49 PM

here you go!

http://www.zilvia.net/f/showthread.p...47#post1089147

06-15-2007, 01:00 AM	#1
S13-KA24DET Leaky Injector Join Date: Aug 2005 Location: So. Cal Posts: 70 Trader Rating: (1) Feedback Score: 1 reviews	clutch pedal pressure raises out of no where, clutch slipping? clutch pedal pressure raises out of no where, clutch slipping? . r33 rb26dett & tranny stock clutch intake straight piping yada yada 15 psi . when i first got her running of course i'd do a couple runs, mostly rolling/2-3rd gear pulls if that matters, the clutch/clutch pedal worked fine *but the rod was adjusted 'all the way out' i know it's usually not supposed to be adjusted all the way but it worked and it would grab about after half way out so i assume my clutch would still grab nicely without the slave pushing it.. . then my ricer self warmed up my tires and then i ran and my clutch was slipping the whole time and afterwards the pedal out of no where has no play/has become pressurized or pressed up hard against the stopper, anyone care to explain why 'out of no where' it would just be like that? i adjusted it now with some free play but have yet to test it out (kinda late right now)

06-15-2007, 01:10 AM	#2
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	it is passing air back and forth, and needs to be bled. __________________ [email protected]

06-15-2007, 09:05 AM	#4
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	If the clutch rod is adjusted improperly (too little free play)...then it builds pressure, and cannot vent it...mainly when hot. SO it's fine when you start driving...but as everything warms up...the line builds pressure and cannot vent it b/c you've adjusted the master cylinder to the point where fluid can enter the line, but cannot vent back to the reservoir. Loosen the clutch rod behind the pedal. Sometimes only take a half turn...so adjust, drive. Adjust, drive...until it's good to go. - Brian __________________ www.KA24DEvelopment.com

06-15-2007, 10:06 AM	#6
downshift_sideways No Limit Soldier. Join Date: Jan 2006 Location: Hayward CA, San Gabriel CA Age: 38 Posts: 5,550 Trader Rating: (0) Rides Gallery: downshift_sideways Feedback Score: 0 reviews	I had the same problem. I readjusted the rod, and bled my clutch out... but it was too late lol... __________________ allntrlundrgrnd: "you never really appreciate your parents fridge until you look into your own and its full of condiments only"

06-20-2007, 04:49 PM	#10
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	here you go! http://www.zilvia.net/f/showthread.p...47#post1089147 __________________ [email protected]

06-15-2007, 01:36 AM	#3
S13-KA24DET Leaky Injector Join Date: Aug 2005 Location: So. Cal Posts: 70 Trader Rating: (1) Feedback Score: 1 reviews	hmm that's odd just cause i've drove it kinda hard for awhile and kept up nicely, care to explain/give me a better understand as how that might happen? or is it just one something that happens outta no where

06-15-2007, 09:49 AM	#5
contranication Zilvia Member Join Date: Jun 2004 Location: West palm Posts: 165 Trader Rating: (0) Feedback Score: 0 reviews	You can also leak out a little air into your system from the hot fluid, any water and air that got absorbed before the system was closed... Make sure your fluid is at the right level. Try switching to a higher temp brake fluid and re-bleed your system if the above doesn't work.

06-20-2007, 05:46 AM	#8
DJ_Sunrise Zilvia FREAK! Join Date: Feb 2004 Location: NJ Age: 38 Posts: 1,134 Trader Rating: (1) Feedback Score: 1 reviews	Check factory specs for dead zone on the clutch. For SR/KA its something around 1/2in on a properly bled system. If you are looking at the pedal from drivers seat, clockwise screws it in shortening pedal travel. Counter clockwise lengthens travel. RB trans on 240s im not sure if the dead zone should be the same, but more than likely. -Bart

06-20-2007, 04:39 PM	#9
redgold Join Date: Sep 2006 Location: saint paul Age: 40 Posts: 35 Trader Rating: (0) Feedback Score: 0 reviews	so if my clutch is grabbing too high, I should shorten the rod or make it longer? :hammer: