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clutch hydraulics

 
Old 03-15-2019, 11:13 AM
  #31  
MAGK944
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Originally Posted by azerite View Post
just an update, i shortened the rod, has been working well for the last 5 days. it still sticks every now and then, but engages well enough. I think the problem might have been that i was pressing the pedal in too deep. Is there such a thing?
It should not stick at all and your pedal should go all the way to the floor without issue. Like others including myself have said, don't go adjusting any linkages as you still have air in the system. KevinGross gave you the best advise but it seemed like you ignored it. gl
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Old 03-15-2019, 11:28 AM
  #32  
azerite
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Originally Posted by MAGK944 View Post


It should not stick at all and your pedal should go all the way to the floor without issue. Like others including myself have said, don't go adjusting any linkages as you still have air in the system. KevinGross gave you the best advise but it seemed like you ignored it. gl
I adjusted the linkage a small amount to account for the slack that's supposed to be there when you initially push the pedal.

As for air, i don't think it's air, at least not from the flush. I have a motive bleeder and used that, and it didn't help, i used a vacuum, and that didn't either, putting the butt in the air was better but not 100%. What T described, is the best so far, pushing the fork in slowly and then building pressure in the pedal. I haven't had to do a bleed since. in the last 5 days, pushing the pedal in and having it stick only happens when the weather is really cold, on first startups. I'm only replying to the threads so that people on the future have something to reference if they face the same thing. The car is driveable and you can feel when the clutch engages, it's working properly, but the pedal sticking every so often has me perplexed.
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Old 03-15-2019, 12:30 PM
  #33  
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Originally Posted by azerite View Post
I adjusted the linkage a small amount to account for the slack that's supposed to be there when you initially push the pedal....
I suppose you and others may have different experiences idk. I had the same issue as you and was tempted to adjust the linkage. I was told not to as I hadnít changed anything that would affect the adjustment. I had just changed master, slave and the rubber, blue & metal pipes and could not get all the air out. The problem was air in the system and itís ususlly the problem in all cases that system hydraulics are opened up. The 944 clutch is particularly onerous as there are voids that can trap the air and make it difficult to evacuate all the air out of the system. Yes itís a pain, but adjusting the linkages when nothing mechanical has been changed is just adding more problems plus, as youíve found out, it doesnít cure the issue.

After various attempts at bleeding what worked for me in getting that last bit of trapped air out was to pressurize the system with a Motive (I use mine dry) and while itís pressurized bleed the clutch old school as if the Motive wasnít hooked up. Youíll need another person to help slowly push the pedal down while you crank open the slave bleed screw, then close the bleed screw before your helper slowly releases the clutch pedal. Repeat several times until the pedal feels firm then disconnect your motive and you should be gtg.

Ive used this ďdoubleĒ method of bleeding a few times since and all worked well, I even use it for my brakes too, itís become a habit.
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Old 03-15-2019, 01:35 PM
  #34  
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After getting pedal, manually bleeding with the fork blocked through the inspection hole with a deep well socket seemed to work better. Light taps with a screw driver handle on both cylinders will help getting the tiny bubbles into one big bubble that will pass/bleed out
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Old 03-15-2019, 09:19 PM
  #35  
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Originally Posted by MAGK944 View Post


I suppose you and others may have different experiences idk. I had the same issue as you and was tempted to adjust the linkage. I was told not to as I hadn’t changed anything that would affect the adjustment. I had just changed master, slave and the rubber, blue & metal pipes and could not get all the air out. The problem was air in the system and it’s ususlly the problem in all cases that system hydraulics are opened up. The 944 clutch is particularly onerous as there are voids that can trap the air and make it difficult to evacuate all the air out of the system. Yes it’s a pain, but adjusting the linkages when nothing mechanical has been changed is just adding more problems plus, as you’ve found out, it doesn’t cure the issue.

After various attempts at bleeding what worked for me in getting that last bit of trapped air out was to pressurize the system with a Motive (I use mine dry) and while it’s pressurized bleed the clutch old school as if the Motive wasn’t hooked up. You’ll need another person to help slowly push the pedal down while you crank open the slave bleed screw, then close the bleed screw before your helper slowly releases the clutch pedal. Repeat several times until the pedal feels firm then disconnect your motive and you should be gtg.

Ive used this “double” method of bleeding a few times since and all worked well, I even use it for my brakes too, it’s become a habit.

Man I'm shocked that I didn't have this crazy hard time bleeding after my clutch / hydraulics work last year? I didn't raise one end or the other and just used the motive with about 15psi pressure. Sure, first time with the pressure only the pedal stayed down but then I had my son hop in and push the pedal a couple times while I quickly opened/closed the screw and... perfect.

Either I'm forgetting or beginner's luck. It just didn't seem that bad. I'm curious if the dealerships had all this trouble back in the day? I can't see them spending time lifting rear ends only... measuring with bubble levels.. having other techs jump in and out pumping this way and that... ...there's got to be something missing (?)
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Old 03-15-2019, 11:14 PM
  #36  
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Originally Posted by MAGK944
...pressurize the system with a Motive (I use mine dry) and while itís pressurized bleed the clutch old school as if the Motive wasnít hooked up. Youíll need another person to help slowly push the pedal down while you crank open the slave bleed screw, then close the bleed screw before your helper slowly releases the clutch pedal. Repeat several times until the pedal feels firm then disconnect your motive and you should be gtg...
Originally Posted by Dan Martinic View Post
Man I'm shocked that I didn't have this crazy hard time bleeding after my clutch / hydraulics work last year? I didn't raise one end or the other and just used the motive with about 15psi pressure. Sure, first time with the pressure only the pedal stayed down but then I had my son hop in and push the pedal a couple times while I quickly opened/closed the screw and... perfect...
So, you basically did as I suggested in my post and it worked
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Old 03-16-2019, 09:45 AM
  #37  
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Originally Posted by MAGK944 View Post




So, you basically did as I suggested in my post and it worked
I guess that's the trick
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