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| clutch pushrod too short?? (Page 1/4) |
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katie80
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JUN 17, 08:21 AM
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I have a 4 speed 4 cylinder 1984 Fiero. It seems like the clutch pushrod is too short or something. ive checked all the hydraulics, it's nothing to do with that. the slave cylinder bottoms out before the clutch is fully disengaged. I have replaced almost everything in the hydraulic system, so I'm wondering if something along the line got replaced with the wrong part. what should I check?
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fierosound
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JUN 17, 09:01 AM
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I had found this problem on a friend's car....
The clutch pedal has 2 switches on it.
The start (clutch down) safety switch and cruise control "off" switch (if you have cruise control).
They may be pressing down on the pedal, not allowing full "up" position and shortening the stroke.
Pull the clutch pedal UP all the way.
The switches should self-adjust if they were down too far.
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My World of Wheels Winners (Click on links below)
3.4L Supercharged 87 GT and Super Duty 4 Indy #163[This message has been edited by fierosound (edited 06-17-2023).]
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katie80
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JUN 17, 09:07 AM
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| quote | Originally posted by fierosound:
I had found this problem on a friend's car....
The clutch pedal has 2 switches on it.
The start (clutch down) safety switch and cruise control "off" switch (if you have cruise control).
They may be pressing down on the pedal, not allowing full "up" position and shortening the stroke.
Pull the clutch pedal UP all the way.
The switches should self-adjust if they were down too far.
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no, this isn't right. the slave cylinder stops the clutch pedal from going all the way down because it's gone as far as it can go. everything before the clutch arm and pushrod is working perfect. if I push the pushrod into the body of the slave cylinder, I get full travel of the pedal, but not of the clutch itself.
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Vintage-Nut
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JUN 17, 09:42 AM
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sleek fiero
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JUN 17, 12:31 PM
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If the clutch disk or release bearing is worn out you can get these symptoms. also check the nylon insert in the clutch arm. They can crack or wear . sleek
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Patrick
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JUN 17, 04:50 PM
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| quote | Originally posted by katie80:
I have a 4 speed 4 cylinder 1984 Fiero. It seems like the clutch pushrod is too short or something.
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I assume this is what the slave for your '84 looks like. It's different than all the other years.
That's a Rodney Dickman slave. He states that the push rod is 138mm... or 5-7/16". That's a little different than reported below.
| quote | Originally posted by Fieroseverywhere Here:
Getrag slave rod length - 3.5 inches (3 1/2")
Isuzu & muncie - 5.625 inches (5 5/8")
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What is the length of the push rod you currently have installed?
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katie80
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JUN 17, 11:54 PM
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| quote | Originally posted by Patrick:
What is the length of the push rod you currently have installed? |
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it is 136 mm. I tried replacing the pushrod with a slightly longer (by about a cm) extension. The clutch disengages fully, but also extra. I don't imagine the 2 mm difference between the pushrods is large enough to make a difference. would that difference really matter that much?
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Patrick
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JUN 18, 12:16 AM
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| quote | Originally posted by katie80:
it is 136 mm.
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According to what I posted earlier, the factory length is 5-5/8"... 143 mm.
| quote | Originally posted by Fieroseverywhere Here:
Getrag slave rod length - 3.5 inches (3 1/2")
Isuzu & muncie - 5.625 inches (5 5/8")
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| quote | Originally posted by katie80:
I tried replacing the pushrod with a slightly longer (by about a cm) extension. The clutch disengages fully, but also extra. would that difference really matter that much?
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"also extra"?
It only takes a fraction on an inch difference in slave travel to make all the difference in the world disengaging the Fiero's clutch. If someone installed a shorter than factory push rod, and this was resulting in the slave reaching the end of its travel before disengaging the clutch... then yes, a 2.5 mm longer push rod might be enough to make a difference.
We've been down this road before with your clutch. The slave needs to move about 1-1/8" to disengage the clutch properly.[This message has been edited by Patrick (edited 06-18-2023).]
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katie80
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JUN 18, 12:45 AM
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| quote | Originally posted by Patrick:
"also extra"?
It only takes a fraction on an inch difference in slave travel to make all the difference in the world disengaging the Fiero's clutch. If someone installed a shorter than factory push rod, and this was resulting in the slave reaching the end of its travel before disengaging the clutch... then yes, a 2.5 mm longer push rod might be enough to make a difference.
We've been down this road before with your clutch. The slave needs to move about 1-1/16" to disengage the clutch properly.
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ah, sorry. been a long day, I didn't fully read your reply through and thought 138 mm was the spec i was going for. I'll see about getting a 143 mm pushrod.
I know the slave needs to move that much, which is why I thought the pushrod was too short, since the slave bottomed out before moving out that much while pushing the clutch arm.
Thank you for the help! I'll let you know if the longer pushrod fixes the issue.
also when I say extra, I mean the clutch engages with the pedal much higher than it ought to. like the clutch arm is extended further than it's meant to.
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Patrick
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JUN 18, 01:12 AM
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| quote | Originally posted by katie80:
also when I say extra, I mean the clutch engages with the pedal much higher than it ought to.
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See what it's like with the factory specified length slave push rod.
In one of your previous threads, you said you replaced the slave. Was this 136 mm push rod the one that came with it?
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