Rocket Rob

The slave cylinder is on the top of the transmission. These thread had good pictures of the slave.

https://rennlist.com/forums/964-1989...-save-you.html.
https://rennlist.com/forums/964-foru...t-leaking.html

To access it, jack up the rear of the car, remove the left rear wheel. The slave is near the top of the tranny. Its in a tight space but its reachable.

These threads have a good description of using the power bleeder.

https://rennlist.com/forums/964-1989...i-thought.html
https://rennlist.com/forums/964-foru...procedure.html

Yes, the brake fluid reservoir supplies brake fluid to both the brakes and clutch.

sschultze09

Rob, your the man.. Thank you sir..

c didy

Good discussion but I need clarification.

It seems like the engine off shifting test has conflicting implications.





"+1 on clutch subsystem... check fluids, then a bleed. One test is to see if it's hard to shift with the car OFF... If it's easy... it's the clutch fluids."
__________________
Tom Bennett


"Does it go into gear easily with the engine off? If no, then ... you have... either a defective clutch pedal roll pin or hydraulic slave/master issue."
__________________
Rob


Does this imply that you can diagnose clutch fluid problems (Tom) vs slave/master problems (Rob) by doing this test?

GT9111

could it be the shift coupler?

tbennett017

Let me clarify my cheap advice... If you can actuate the gear lever while the car is not running, this would indicate to me that the shift linkage is okay, but that there is stress being put on the gearbox because the clutch is not being actuated. When the engine is running, the clutch is not disengaging the torque, so I'd look for the causes that would keep a clutch from engaging... hydraulics and the rest of the mechanism.

If I can project to Rob's advice, which holds water too.... If it doesn't go into gear easily with the engine off, I'd look at the shift linkages, as the problem is independent of the engine torque.

Rocket Rob

Good synopsis Tom

+964

Nine11

Update:

Thanks for the suggestions so far. I have had the clutch bled and the symptoms are somewhat there still. The car on start up and for the first 1/2 hour, the transmission goes into every gear smoothly. However, after driving for a bit, 1st gear gets progressively more difficult to engage. Shifting to 2nd, 3rd etc while in motion is a non issue. It's when sitting at a light or a stop sign and trying to engage 1st.

FeralComprehension

These cars are old and the plastic bits are tired. Assuming you're committed to the car, start with the clutch slave and corresponding soft line, then if you need to, replace the master.

Your symptoms were mine exactly; a new slave/line did the trick.

Nine11

Thanks. I may do that, the shop did do a visual inspection and didn't see it to be leaking fluids from the cylinder...so we just tried the bleed. They suggested to drop the tranny and see what could be causing this inside....

Richard Curtis

Sounds to me like typical signs of a worn-out clutch.

Nine11

It could be, there is no signs of slippage from the clutch but I have been meaning to get that LWF installed. Maybe this is the opportunity. I'll hunt down the cause eventually. Thanks for the suggestions guys, if there is any more ideas, I'm all ears.

Son's engineer

Hi guys,
Here I am all those years after you made your invaluable posts on the problem of a 964 not going into gear with the engine running but doing so easily when engine is off. I do believe you have led me to the solution - a hydraulic problem. However, the fluid level looks fine. I suppose it could be a worn master or slave cylinder and that air has got into the system. Will now check them out and keep my fingers crossed because don't imagine cylinder replacement will be too big a problem.

FeralComprehension

Couple hours or so; pretty easy but a little tight in places

Son's engineer

Thanks for that - same model - really is a delight to drive.

c didy

If you go to the trouble of doing the slave cylinder definitely replace hydraulic line at the same time.