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| New day, new clutch problem (Headscratcher alert) (Page 4/5) |
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Dukesterpro
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NOV 14, 01:15 PM
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Patrick
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NOV 14, 09:14 PM
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| quote | Originally posted by Dukesterpro:
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Use the forum's image server... so we can actually see your images!
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Dukesterpro
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NOV 15, 10:59 AM
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skywurz
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NOV 15, 12:09 PM
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| quote | Originally posted by Dukesterpro:
Any thoughts? |
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This is where I pull out the popcorn and wait for theogre to show up and rant about The Fiero Store and its quality 
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Dukesterpro
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NOV 15, 03:26 PM
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I don't have enough experience to argue about what the Fiero store is or isn't. I can say they have been helpful on the phone into sourcing a warrantied replacement fork, and I still don't know for sure what the root cause is here.
If you believe there is a better alternative to the Fiero stores clutch fork please inform me. But as of now they are the only trusty-worthy folks making them, that I know of. . .
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Spoon
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NOV 15, 08:24 PM
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Back to the drawing board.. Your replacement clutch is a LUK brand, clamping force in pounds not mentioned but I'm assuming it is much stronger than the factory stock clutch. The stock slave cylinder & seals, Clutch Arm and fork, release bearing were engineered to engage a clutch with xxx lbs of force and maybe a little extra. Grandma herself could handle this setup.
Little Johnny comes along and installs a super duty clutch that takes both feet on the pedal to disengage. All the remaining stock working parts now have to endure this heavy load they were not designed to support. Results could be bent clutch pedal, broken clutch arm, bent clutch fork, damaged throw-out bearing, internal seal leakage in slave cylinder and early failure of the clutch system.
Hydraulic floor jacks, engine hoists and bottle jacks have a rating on them to not be exceeded. Unfortunately clutch assemblies don't mention anything. They just give you the clamping force of the clutch and the rest is up to the buyer to figure out or not.
Perhaps The Fiero Store clutch fork was designed for OEM clutch assemblies.
Bottom line may be to seek out the weak links in the system and improve with the best quality parts you can acquire.
Just my 2 cents...
Spoon
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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut
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skywurz
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NOV 15, 08:38 PM
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I installed the v6 luk clutch on my 2.5 and it doesn't give me any problems. My guess is defective clutch fork.
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Dukesterpro
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NOV 16, 09:53 AM
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Hi Spoon,
I got concerned that maybe the LUK kit which seems to be very popular, is over spec, I gave LUK a call. (Was a absolute mess trying to get a phone number) Looks like the 04-077 has exactly the same clamping force (he gave me a number, I forgot it) as the OEM assembly. I decided to test this out by standing on my original pressure plate and my LUK plate. Through this incredibly crude test I discovered the LUK plate is actually slightly SOFTER than the OEM springs, even though they are 38 years old.
I'm starting to think I might just have gotten unlucky with this fork.
Does anyone see any unusual wear on the face of the pressure plate. Most cars I have done clutch jobs on typically look something like that. But does anyone see anything obviously janky?
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Patrick
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NOV 16, 06:59 PM
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| quote | Originally posted by Dukesterpro:
I gave LUK a call. Looks like the 04-077 has exactly the same clamping force as the OEM assembly.
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That's in agreement with everything I've read here over the years regarding the LUK clutch kit. It's basically a direct replacement for the factory unit.
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Spoon
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NOV 19, 06:23 PM
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| quote | Originally posted by Dukesterpro:
I decided to test this out by standing on my original pressure plate and my LUK plate. Through this incredibly crude test I discovered the LUK plate is actually slightly SOFTER than the OEM springs, even though they are 38 years old.
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Interesting concept.. This may be a better way.
https://youtu.be/kbNyutEon08
You may want to research clutch clamping pressure versus torque, weight of vehicle, etc...
Spoon
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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut
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