360 manual clutch not disengaging

Possibly a bad master cylinder not moving enough fluid. Could be air in the system.
Am I reading right that you renewed the seals because of this issue and it did not change?

 

How is the pilot bearing ?
Can you see the clutch disengaging through the access door when you press the pedal ?

 

Did you bleed the system from the clutch block on the trans?


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1 cm is not that bad. That's the order of magnitude measured on F1 cars with the clutch position sensor, between a closed clutch and open clutch.
Again, have you checked that the pilot bearing is not starting to seize ?

 

Try pumping the petal very quickly with no pause and then see if the action of the petal is higher than before. If it is, there is still air in the system. I use a pressure bleeder and it will bleed completely air free and still have a bubble trapped in the system. I then have the pressure bleeder attached and have another tech pump the petal quickly and hold it down, then I bleed it again still holding the petal. That usually gets the last bit of air out. Unlike brake systems, the fluid stream actually moves and to create the action at the bearing. This is why pumping the petal will make the petal feel better. it compresses the air bubble and then the petal moves more fluid instead of compressing air. When released and allowed to set, the air bubble expands again and then you will have a soft feel at the petal as the petal has to compress the bubble before moving the bearing. I suspect that is why you only have 1/3 petal action.

 

Obstruction in the line.

 

Collapsed pressure plate. Did you look at the fingers of the pressure plate when you had it apart. It is common for the plates to fail and when that occurs often the fingers will be at different levels and the plate will flex rather then disengaging the clutch. What started the problem? New clutch, surfaced flywheel any other repairs leading up to the problem? These can be very difficult to bleed if you have gotten air into the master cylinder or line near the master cylinder.

 

I didn't know 'creaking' was normal with clutch. Indeed the operation of engagement and disengagement should be silent. Its likely a part of the clutch disc has separated, effectively making the driven disc thicker. No amount of bleeding will help. In this case you need to inspect the clutch driven disc and pressure plate.

 

Thank Windsock for the win!