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1994.5 - 1997 7.3L Power Stroke Diesel  

Weird clutch issue!

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Old Nov 24, 2019 | 06:07 PM
  #1  
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Weird clutch issue!

I have a 5 sp manual on the 96, and while driving down road in traffic the clutch started creeping to the floor lower with every stop until i had no pedal. The pedal stayed on the floor. I had to shut it off to get in gear and start it to get off the road. Went to take off chutch resivor* and cap was very tight. Got it off and it was full. By the time i go back to cab the pedal was slowly raising. It returned to normal position, i started it and it works fine now.
Im assuming it was a vapor lock or water or something like that. Any ideas?
 
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Old Nov 25, 2019 | 08:26 AM
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From: Bahstun
Sounds like vapor lock to me
 
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Old Nov 25, 2019 | 02:28 PM
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Yep, the cap was very tight and the pedal came back when the cap came off. I just thought i would put this post out there to see if someone had some thoughts i didnt think of. The temperature had just dropped below freezing while driving but not sure if it played a role.
 
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Old Nov 26, 2019 | 01:09 PM
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From: Bahstun
many of the caps have a vent to the bellows/bladder (dont recall if it has one) to allow air in over time when fluid drops from wear
If that vent is clogged, then what happened to you is the result

Heat expands the air
cold contracts making a vacuum
 
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Old Nov 26, 2019 | 03:52 PM
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I didnt see a vent but once the pedal came back up all i wanted to do was get out of town and away from all the crazy drivers as it was snowing heavy {less than 1/4 mile vis}. Been fine since.
 
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Old Nov 26, 2019 | 04:01 PM
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From: Bahstun



see the little round thing before DOT 3 on bottom of the cap? that's the vent
 
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Old Nov 26, 2019 | 04:18 PM
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Good to know about the vent.

But to all readers, in the old days we would massage the rubber diaphragm almost flat for brake reservoirs, but for this clutch reservoir I think we are supposed to leave diaphragm extended out as in picture on the left, ( posted pics courtesy of knottyrope )

Wat say you, my brothers and sisters ??
 
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Old Nov 26, 2019 | 04:37 PM
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When i pulled the cap off originally the bladder was not extended and the fluid level was full with the pedal on the floor. After putting the cap back on the pedal slowly raised to proper position and worked fine. I just checked it now and the bladder is fully extended as in the picture and fluid level is in the lower 1/4. The hole in the cap must have had some ice in or on it . I put it back on and will now forget about it as my brain can only hold so much. Now i have to remember how to adjust the valves on my snow machine.
 
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