So I recently purchased a '91 YJ 4-cyl and for the most part, it's been running fine. However, I tried to start it today and found that I was unable to shift out of neutral (I just get grinding). I can shift into any gear when the engine is off. If I try to start it in first gear (with the clutch pedal to the floor), it will lunge forward. So basically, I know that the clutch is not disengaging when I press the pedal.
The clutch fluid reservoir is full. With my hand to the clutch hydraulic line (near where it enters the bell housing), I can feel fluid moving if I press the clutch pedal. Also, I can easily move the line about 2 inches in-and-out of the bell housing, although I think I could do this when the clutch was working - is this normal?
My best guess is that there is some problem with the slave cylinder, or the clutch is rusted to the flywheel (I hadn't driven the vehicle for several days). Has anyone else experienced this? I plan on dropping the tranny to check things out unless someone has a simpler solution.