850 Hydraulic clutch Issue

[manovlov]

Thanks a lot for this advice I will use it tomorrow
Manov

[manovlov]

Hy,

Here is the part I've taken out. As you can see, the hose has a clamp and the hose is a stiff one. The one I have installed is a soft one, and I have forgotten the clamp. I will put everything on place and see how it goes.

Manov

[manovlov]

So, the issue comes from the soft hose I have installed to replace the old one. This hose is too soft. I have to unbolt everything between the master cylinder brakes lines, the master cylinder itself, the brake booster (a bit to be able to move the pedal clutch cylinder), and replace the hose by a good one.

I've tested Chuck advice, and it works great.

This afternoon, it's sunny, I'm in the street to work, which I don't appreciate much, but, this car will be able to change speeds at the end of the day : I now know the process, I have the tools !

Manov.

[manovlov]

What is that mess ? For the second time, the slave cylinder on the gearbox has exploded ! I don't understand... The first one, ok, let's admit that as a newbie, my IQ is low enough to be unable ton hold wrench. But two times at a week of distance, it can may be not be my fault...

I've emptied the all system properly, removed the hose that was too thin to me, replaced everything with clamp, screw the right way, feed up the master cylinder reservoir, everything was fine. I've pressed 2-3 times the slave cylinder to see if it was ok, then I sat behind the steering and when I pushed the clutch pedal, there was a "normal" resistance, it came back to its normal place , I've pushed a 2 time, the pedal stayed glued in front of the bay. I've look to the slave cylinder on the gearbox, it was full of liquid, in extension, the piston out !!!

I don't understand. Any idea ?

Here's the page of another parts seller.Can someone advice me about which one should be near to the OEM part ?
https://www.oscaro.com/fr/search?q=9181 ... HJ-KeKwHYN

or

https://www.piecesauto.com/fr/recherche ... ce=9181017


Manov

[abscate]

There might be an adjustment you have to make on the pushrod to take up the clearance

I don’t know the external type system at all so I’m guessing

[scot850]

I have not seen the manual slave cylinder on an 850 or P80 for that matter. What I do know from older Volvos and other manual transmission cars is that as abscate says, there is often an adjustment that can be made to the slave cylinder rod connected to the arm carrying the release bearing. This helps take up any wear in the clutch as it wears to give you a complete travel on the clutch. It looks to me as if the rod is over extending. This would happen if there is too much slack in the system.

When you press the clutch peddle, do you feel resistance almost immediately or is there some travel of the peddle before you feel resistance? If there is too much travel before the clutch begins to operate the slave cylinder might over extend allowing what you are seeing to happen.

Is the clutch release arm possibly bent or cracked?

I have seen the adjustment to the clutch release on the pivot point of the release arm.

I will try to find if there is an adjustment on the 850 clutch. Can you PM me the VIN# so I can hopefully find the correct version. I will look at that on Sunday for you.

Neil.

[Chuck W]

It looks more like that c-clip is not staying seated. That's why it looks over-extended. I've had that happen to me on my current manual swap in my '97. Got it bled, pumped things a couple times, then *clink* *pop* mess all over.

My suggestion (After cleaning everything up ) is to reinstall the slave, seat the c-clip as well as you can, checking all around to make sure it's seated. Then take a hose clamp that is big enough to go around the slave cylinder body, and tighten that down to help secure the c-clip.
The transmission I have was damaged before I got it, and the boss on the bellhousing is a bit dodgy. I wound up installing that clamp years ago when I replaced a clutch in the car I pulled this transmission from. I'd forgotten about it until this happened on my project.

Your c-clip may also be damaged. It looks to be pretty bent and "open", so it also is probably time for a new one anyway.

[manovlov]

Hy Buddies,

Thanks much to ally three for your caring.

@abscate : there is no part to be adjusted on the slave cylinder, I mean that's just a "piston".

@scot850 : PM sended. To answer to your question, when I press on the peddle, I feel immediately a resistance and this clutch cylinder on the gearbox works fine. Then the peddle comes back to its place and at the second time, it stays sticked at the bottom of the compartment. The last part I've installed the last week worked fine before to finish the same way. I may mean to me that I 've have installed the stuff properly. The clutch has been replaced on September la st year : everything is brand new : excepted the pin on the fork. But on this point I doubt it could be the issue, this pin I mean. But, as a newbie, I may be wrong.

@Chuck W : Yes, it seems to be what happens.The part is called by Skandix a "Pro version" on their catalog. I'm leaning towards the idea of the throat holding the c-clip not deep enough to keep it in place, a manufacturing defect. Your explanation sounds a good track to me. I'm not going to re install it using your tip, because it's not normal to the this part to do its job this way. I will send back the part to Skandix For me the part is defect, because using a clamp, you will admit... The c-clip is brand new, ordered and received it last week.

About the links I've posted before, could someone advice me on which one should I buy ? What is the OEM for my car from you ?

Thanks again so much to make me feel to be not only on this issue. I keep a glass of white wine aside for the next time we will meet...

Manov

Edit : I've taken a look to another dealer, and comparing what I can see on Volvopartswebstore, this could fit to my car :
https://www.piecesauto.com/fr/recepteur ... 69179.html

Clutch part.jpg (93.11 KiB) Viewed 775 times

[Chuck W]

@Chuck W : Yes, it seems to be what happens.The part is called by Skandix a "Pro version" on their catalog. I'm leaning towards the idea of the throat holding the c-clip not deep enough to keep it in place, a manufacturing defect. Your explanation sounds a good track to me. I'm not going to re install it using your tip, because it's not normal to the this part to do its job this way. I will send back the part to Skandix For me the part is defect, because using a clamp, you will admit... The c-clip is brand new, ordered and received it last week.

I'm just basing this on the picture you posted above. The gap in the c-clip looks to be well over 10mm. On my spare clip I have in the garage, that clip is closer to 3mm.

If the c-clip is in good order, that groove on the cylinder is plenty deep enough to hold things in place IF the c-clip is fully seated all the way around. When installed that gap should be no more than 3-4mm or so, as you have to expand it slightly to get it over the cylinder body, and it then snaps back to size once it seats.

Post a picture of the c-clip not installed, just to see if it's bent or deformed at all, because in the picture above, it looks bent and pretty useless.

[manovlov]

[/quote]
Post a picture of the c-clip not installed, just to see if it's bent or deformed at all, because in the picture above, it looks bent and pretty useless.
[/quote]

Hy Chuck,

I will post the picture as soon ASAP. For the moment, here's the second cylinder. Curious to see that the inside seal broke the exact same way. I still bend for a defect part.

I don't know if the inside seal has been hurt, so to try to re install this slave cylinder, if the trouble still stay, not a good idea I think.

Manov

The first master cylinder

The last one