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-   -   Clutch Won't Depress Series III (https://www.landroversonly.com/forums/f7/clutch-wont-depress-series-iii-43880/)

tuxmiller 08-07-2010 03:46 PM

Clutch Won't Depress Series III
 
I'm depressed, but my clutch isn't.

Driving home today in my sweet little lemon, the gears stopped catching smoothly as I shifted. The engine would race a little and then it would catch as I eased up on the gas pedal. Then I could tell I was starting to lose my grip as I could barely make it up a hill.

As I turned into my driveway the clutch would no longer depress. It's locked in the upright position, just like the flight attendant would want it, but that's not how I want it to be. I want it to depress so I can switch gears, which, in turn, will allow me to drive again.

I checked the clutch fluid reservoir and guess what? It was full, so that's not the problem.

Do I have a master and/or slave problem?

Tearfully,
Scott

TerryS 08-07-2010 05:05 PM

Quote:

Originally Posted by tuxmiller (Post 353344)
I'm depressed, but my clutch isn't.

Driving home today in my sweet little lemon, the gears stopped catching smoothly as I shifted. The engine would race a little and then it would catch as I eased up on the gas pedal. Then I could tell I was starting to lose my grip as I could barely make it up a hill.

This portion of your description of the problem sounds like you're describing a sliping clutch. That could be that your friction plate is shot; your pressure plate isn't clamping sufficiently; or your hydraulics aren't allowing the throwout bearing to fully relax.

Quote:

Originally Posted by tuxmiller (Post 353344)
As I turned into my driveway the clutch would no longer depress. It's locked in the upright position, just like the flight attendant would want it, but that's not how I want it to be. I want it to depress so I can switch gears, which, in turn, will allow me to drive again.

This part of your descriptions seems to be describing a pedal which can't be pushed down. Adding the two parts together is making me wonder if your problem might lie in the actual pedal box. The cross pin may have worked part way out, which was initially preventing the pedal from fully returning; hence the slipping (engine revving, barely able to make forward momentum).
If the pedal can not be pressed towards the floor, it seems more mechanical, and perhaps, now, the pedal cross pin is so coked as to prevent any pedal shaft motion.


Quote:

Originally Posted by tuxmiller (Post 353344)
I checked the clutch fluid reservoir and guess what? It was full, so that's not the problem.

Do I have a master and/or slave problem?

Tearfully,
Scott

To positively eliminate the hydraulics as the possibel problem, crawl beneath the truck and crack the bleed screw on the slave. Depending on what year S3 you have, the bleed screw is in the end of the slave, or out at the end of some pipework (remote bleed screw) With the bleed screw open, have someone try depressing the clutch. If it now goes down, it may be a mechanical problem with the throwout arm, or release bearing.
Another possibility is that the check valve on the end of the master piston isn't releasing, because there is pressure in the line still with the pedal all the way up. A few operations of the pedal could have slowly pushed the slave to it's limit, and now the system is hydrolocked. This is probably due to a badly adjusted pedal piston rod.

tuxmiller 08-08-2010 05:13 AM

wow. thanks. what do I do if it's hydro-locked?

TerryS 08-08-2010 06:36 AM

Quote:

Originally Posted by tuxmiller (Post 353422)
wow. thanks. what do I do if it's hydro-locked?

If you let it sit overnight, by now it will have bled the pressure off thru the checkvalve. (If that's what the problem was) So, go see if you can push the pedal down now. If you can, it's probably not mechanical, i.e. pedal crosspin.
Don't sit there with a shit eating grin on your face, pumping away, and saying 'oh goody,, no more problem.' because you'll just hydrolock it again.
After you were successfully able to push the pedal down once, go get you green bible and adjust the pedal freeplay, and then you can go play.

tuxmiller 08-09-2010 11:38 AM

Nope, it's still in an upright and locked position. Can't even force it down. On to plan "B"...

Greg S 08-09-2010 08:17 PM

I had one lock up in the down position, the pushrod in the master cylinder had bent to a 90 degree angle. My foot was on the pedal at the time but I can't explain how it happened. Simply depressed the pedal and it wouldn't come up.

jimrr 08-16-2010 11:18 PM

as i recall, series 3 hydrostatic clutch is not adjustable, the length of throw is predetermined.
hydro pressure on the clutch release seems most viable, if this can be eliminated, IE: ensure slave cylinder rod is indeed retracted, then you have a issue in the bell housing.
use some good hardware when you put it back together!

tuxmiller 09-08-2010 01:54 PM

What next?
 
OK, so I bled the clutch and here's what happened:

1). I was able to depress clutch to floor while bleed valve was open.
2). We cleared out all dirty clutch fluid and kept it topped off.
3). When I was able to depress the clutch, I was also able to shift gears as you normally would be able to.
4). When we close the valve each depression of the clutch would allow less downward motion. So it might be 3/4 first pump, then half and then stay at 1/4, not allowing you to depress any futher (kind of locking up).
5). As soon as we closed the valve and allowed the clutch pedal back up, we could never depress to the floor and shift gears again until we opened the bleed valve again.

Does this suggest a leak? Or if not that, then what?

KevinNY 09-08-2010 02:54 PM

Sounds like a new master cylinder is next. It's actually a very easy job if you remove the wing. I just did it last weekend.


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