Clutch Fun
Printed From: West Coast Fieros
Category: Technical Topics Forum
Forum Name: Technical Questions and Discussions
Forum Description: Got a technical question about your fiero? ask it here.
URL: http://www.westcoastfieros.com/forum/forum_posts.asp?TID=3327
Printed Date: 22 November 2024 at 5:25am
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Topic: Clutch Fun
Posted By: CFoss
Subject: Clutch Fun
Date Posted: 16 September 2013 at 8:28pm
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Sooooo,
I got my car running well again today after some small hurdles... Now kind of a big hurdle. My new 6-pack clutch won't disengage. I used a clutchnet clutch with the original pressure plate and throwout etc. Everything seemed to go together well. I'm getting a full 2.5cm (1 inch) on the slave so that seems pretty good. It is extremely repedative and does not bleed down if held. The clutch doesn't pickup lots of friction until the pedal is halfway out, but it will not fully release at fully in. It will not allow gear engagement at idle in first or reverse. The pedal feels stiff initially, then eases up at the end of the stroke. It feels like this is the pressure plate characteristic, rather than the hydraulics. I'm done for tonight, but if anyone has any kernels of wisdom, now is the time! Chay ------------- 86 SE 3.4 |
Replies:
Posted By: CFoss
Date Posted: 16 September 2013 at 9:53pm
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Well, I figured out what is going on...
Turns out my slave travel is too good ha ha. As I press the clutch in, it releases, and then as I continue it grabs again somewhat. The only explanation I can come up with is that the pressure plate fingers are making contact with the clutch plate somehow. I plan to limit the travel of the clutch pedal somehow to get me into the sweet spot. I'll make it removable in case it needs to come out again for some reason. Chay ------------- 86 SE 3.4 |
Posted By: Patrick
Date Posted: 16 September 2013 at 10:33pm
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Make an adjustable clutch master banjo. The 5/16"-18 threaded coupler will cost about $1.50 at Home Depot. Works great to either increase or decrease the throw.
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CFoss wrote:
Posted By: CFoss
Date Posted: 16 September 2013 at 10:53pm
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Thanks for the suggestion. I'll check it out.
Chay ------------- 86 SE 3.4 |
Posted By: CFoss
Date Posted: 17 September 2013 at 11:01am
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Well, did the mod, shortened the pushrod between 1/2 and 3/4" and now it's perfect. It doesn't go to far, and it picks up torque when the pedal is about 1/2" up from the floorboard which is right where I like it.
Thanks you so much Patrick! 
Chay ------------- 86 SE 3.4 |
Posted By: Patrick
Date Posted: 17 September 2013 at 12:07pm
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Hey, glad it worked for you. Normally this mod is done to the banjo in order to increase the throw, but I figured it would work well for what you needed as well.
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Posted By: Patrick
Date Posted: 18 September 2013 at 12:18am
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Chay, since I helped solve your clutch problem, it now seems only fair that you help solve my clutch problem. Have a look http://www.fiero.nl/forum/Forum2/HTML/130232.html - Here . Hey, I'm open to suggestions on this from anyone!
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Posted By: karnak
Date Posted: 18 September 2013 at 7:54pm
Here are a couple of shots.. all good in there...
if a little grease is what you need, lets make a plan to do that. 
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Posted By: CFoss
Date Posted: 19 September 2013 at 11:53am
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From your thread:
"I unbolted the slave. It should move easliy in the disengage direction, but in the engage direction is should hit the spot where the throw out hits the fingers of the pressure plate and be VERY difficult to move by hand after that. If not, there are internal issues.
So from this statement I assume that you in fact have this situation, that it hardens up when the throw out hits the pres plate.
So, where exactly, during the clutch throw, does it feel like it's binding...on the way in or on the way out or both? Does it happen in the same spot in and out?
It's tough to try and troubleshoot stuff that's inside from what is outside. It's very frustrating and I feel your pain. My only experience with clutch fork stuff is that I bent one to the point of breaking. I had to remove the trans of course, then I welded it up so strong that it will not ever break again. Did you install a new pressure plate with the clutch or anything??
Chay ------------- 86 SE 3.4 |
Posted By: Patrick
Date Posted: 19 September 2013 at 1:27pm
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Yes, that's what occurs.
Yes, it feels as it should.
95% of the time when it happens, it occurs on the way out... while the clutch is being engaged. And it always happens immediately before full engagement.
Oh yes, it was a LUK clutch "kit"... clutch disc, pressure plate, throw-out bearing, and the flywheel was resurfaced. This is unlike anything I've ever previously experienced while driving a manual tranny car. Gary (karnak) sent me a link to a BMW forum thread, and people there were reporting the same issue with their cars... so at least it's not strictly a Fiero thing!
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Posted By: CFoss
Date Posted: 19 September 2013 at 1:36pm
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So, does the pedal stop pushing on you then, like it's hanging up on the way out?
It's hard to imagine, with the forces involved, that the throw out would hang up, so clutch fork bent/slipped/broken or clutch fork bushings messed up?
I would guess you would feel the bushings when you moved the clutch release handle though.
My new clutch is really grabby, but it doesn't bind though. I don't really know what to tell you. Does the lever/cup seem to be in allignment with the pushrod from the slave when it contacts the fingers(Is the cup rotating as to bind the rod?)? Not really sure.
Chay ------------- 86 SE 3.4 |
Posted By: Patrick
Date Posted: 19 September 2013 at 2:06pm
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Keep in mind it only hangs up for a millisecond before it lets go. So yes, I guess it probably stops "pushing" on the pedal, but it happens so fast I'm not aware of it... until I feel it sort of jerk a bit and the clutch very quickly engages.
Gary and I are wondering now if something got tweaked when the old clutch disc blew up (which occurred before I got the car).
Yes, but it felt quite smooth when I unbolted the slave to check.
From what I can see just looking at the slave rod/cup while it's stationary, it looks fine. The next time I'm at Gary and Colby's place, we'll have a chance to see what it looks like while the clutch pedal is being pushed. This is quite a challenge!
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Posted By: CFoss
Date Posted: 20 September 2013 at 8:26am
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I was thinking...do you know if the fork 'tines' contact the throw out bearing evenly, thus holding the throw out straight? I was thinking if one got bent it would allow the throw out to torque off linearly on the shaft, causing it to bind. Just a shot in the dark. Chay ------------- 86 SE 3.4 |
Posted By: Patrick
Date Posted: 20 September 2013 at 8:57am
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That's as good of a suggestion as we've heard. Before we dropped the cradle to change the clutch (because we had been told the clutch slipped very badly), we got the engine to run (after swapping the fuel pump etc) and there were some awful noises occasionally being produced from inside the bellhousing. When we then pulled the tranny, we discovered that the clutch disc was in a dozen pieces. It's certainly possible that the clutch fork got tweaked.
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Posted By: CFoss
Date Posted: 20 September 2013 at 10:19am
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Yeah. That's a nice amount of scoring on the inside of the pressure plate.
Who knows what could have happened.
C ------------- 86 SE 3.4 |