Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk > S Chassis

S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


Reply
 
Thread Tools Display Modes
Old 09-19-2014, 06:27 AM   #1
ProjectPanda13
Zilvia Addict
 
Join Date: Dec 2007
Location: Atlanta, GA
Age: 33
Posts: 603
Trader Rating: (8)
ProjectPanda13 is an unknown quantity at this point
Feedback Score: 8 reviews
Send a message via AIM to ProjectPanda13
'pump up' clutch pedal issue

I have been having an issue with 'pump up', very much like what DSM encounter with their clutches. Before driving, the clutch pedal is soft and engages low, but as I drive the pedal becomes stiffer and the engagement point moves higher up. When I adjust the pedal lower, like what the DSM guys do, I can feel the pressure release. But if I adjust it too low, I am not able to get into gear.

All this happened about a year ago when I did a clutch replacement. I installed a ClutchMasters FX350 along with a their lightweight steel flywheel. I also installed new pilot and throwout bearing, not to mention arp flywheel bolts. After the install, I had to adjust the clutch pedal further out since I couldn't get into gear. The next morning, I drove the car to work and I first encountered the stiff pedal. I played with the adjustment for a week before finding a decent length that didn't allow the pedal to get too stiff, but still stiffer, and drove it til now. I also have to pop the clutch pedal sometimes to be able to get into gear. I also installed a Nismo slave cylinder to see if it helps, but it didn't

Last night, after a long drive in traffic, my pedal lost all pressure and I had to pump the pedal multiple times to get pressure and also adjusted the pedal to the end of the rod. I made it home but with difficulty. I rebleed the system and have been able to drive it, but have to pop the clutch pedal more often now.

Any idea what it could be? I am going to attempt to replace the master cylinder to see if that will solve the problem. Anyone experience this on their car?

Sorry for the long explanation.

Thanks,
-Dave
ProjectPanda13 is offline   Reply With Quote
Sponsored Links
Old 09-22-2014, 04:59 AM   #2
Rayne
Zilvia Addict
 
Rayne's Avatar
 
Join Date: Feb 2005
Location: Earth
Posts: 676
Trader Rating: (0)
Rayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfectionRayne is close to perfection
Feedback Score: 0 reviews
Is the clutch line coming off of the clutch master cylinder connected to the: A) dampner box or b) directly to the clutch slave cylinder?
Rayne is offline   Reply With Quote
Old 09-22-2014, 10:44 AM   #3
ProjectPanda13
Zilvia Addict
 
Join Date: Dec 2007
Location: Atlanta, GA
Age: 33
Posts: 603
Trader Rating: (8)
ProjectPanda13 is an unknown quantity at this point
Feedback Score: 8 reviews
Send a message via AIM to ProjectPanda13
The line goes through the damper box. I am hoping to remove it this weekend and see.
-Dave
ProjectPanda13 is offline   Reply With Quote
Old 09-28-2014, 08:11 AM   #4
spiegel420
 
spiegel420's Avatar
 
Join Date: Feb 2012
Location: washingotn
Age: 35
Posts: 28
Trader Rating: (0)
spiegel420 is an unknown quantity at this point
Feedback Score: 0 reviews
Air. That damper box is a pain to bleed. Remove it, bleed it, done.
spiegel420 is offline   Reply With Quote
Old 09-28-2014, 10:12 AM   #5
FaLKoN240
Super Moderator
 
FaLKoN240's Avatar
 
Join Date: Jun 2004
Location: SF Bay Area
Posts: 16,760
Trader Rating: (73)
FaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfectionFaLKoN240 is close to perfection
Feedback Score: 73 reviews
I would've thrown the dampener box away when I changed the slave.

In fact, that's what I did when I changed my slave cyl out earlier this year.
__________________

Best way to do business with me? Make your best offer FIRST.
FaLKoN240 is offline   Reply With Quote
Old 09-28-2014, 01:06 PM   #6
ProjectPanda13
Zilvia Addict
 
Join Date: Dec 2007
Location: Atlanta, GA
Age: 33
Posts: 603
Trader Rating: (8)
ProjectPanda13 is an unknown quantity at this point
Feedback Score: 8 reviews
Send a message via AIM to ProjectPanda13
Yea, I should have at the time. But I had this pump up problem when I first installed my clutch without opening up the system, so I didn't think air was an issue. I haven't had time to do my clutch master cylinder replacement this weekend liked I had hoped. So hopefully, I can free up some time this coming week. I'll, definitely remove the damper box also. I'll keep every posted. Thanks.
Latez,
-Dave
ProjectPanda13 is offline   Reply With Quote
Old 10-20-2014, 08:54 AM   #7
ProjectPanda13
Zilvia Addict
 
Join Date: Dec 2007
Location: Atlanta, GA
Age: 33
Posts: 603
Trader Rating: (8)
ProjectPanda13 is an unknown quantity at this point
Feedback Score: 8 reviews
Send a message via AIM to ProjectPanda13
UPDATE:

So I replaced my clutch master cylinder and removed the damper box. This has solved my clutch pump up issue. However, with the clutch master I had to adjust the rod all the way out to the end to get enough movement to engage and disengage my clutch. I can now go in and out of gear smoothly but the rod is adjusted out to the max and the clutch stop bolt removed.

Would I run into any issues in the future with this?

Thanks and Latez,
-Dave
ProjectPanda13 is offline   Reply With Quote
Old 10-20-2014, 03:51 PM   #8
spiegel420
 
spiegel420's Avatar
 
Join Date: Feb 2012
Location: washingotn
Age: 35
Posts: 28
Trader Rating: (0)
spiegel420 is an unknown quantity at this point
Feedback Score: 0 reviews
I would use the stopper bolt. Otherwise their will be constant extra pressure on the master. Which may or may not encourage it to fail sooner. As long as youre happy with the pedal feel, and engament point, once that bolt is in, youre good! My car uses the cruise control release switch as the stopper.
spiegel420 is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 07:06 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
vB.Sponsors
Copyright © 1998 - 2019, Zilvia.net™