Clutch hydraulic oil - leak?

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H

Husa98

Joined
Jul 29, 2002
Messages
201
Location
Zwiesel, Germany (Bavarian)
Hi,

in May i lost the function of my clutch surprisingly.

I had to fill up the oil, but after a round (7 km) the oil was not stone empty, but I can´t carry on.

I changed the o-ring of the clutch slave cylinder, although I cant see any failure.
The bike had at this time round about 20 h !

since then the clutch worked good until last week and 8 h later.
We go back from the wood to the house of my friend and after 2 km the pressure point was nearly lost.
The oil tank was empty.

It is no leak to see!

I am sure this is not normal!

I use a normal hydraulic oil for hydraulic cylinder. (Unimog)

Can it be a problem of the viscosity?

But in may i loss the function after the first 3 km of a race, the bike was not really hot.

And now i loss the function AFTER a mini track section of20 km, not during the term.


Whats your opinion?

OT: Taffy, tomorrow I start the wiesn time at 4 pm :hello1:
 
Hello,

I know you cannot use brake fluid for the reason that it will damage the O rings. Maybe the hydraulic oil you are using is also aggressive and damages the O rings. Try proper clutch oil, or automatic transmission oil, or fork oil, or even baby oil! :D

I've used automatic transmission oil on mine, more than nine months ago, and no problems !

More info here:

http://www.husaberg.org/index.php?name=PNphpBB2&file=viewtopic&t=3956&highlight=clutch+oil
 
if you are losing fluid and its not showing on the outside of the system, its got to be going inside. either its getting past the o ring you changed due to a scored cylinder or whatnot even a bad new oring. make sure it is properly bled of all air bubbles by bleeding it upwards. take it off the engine and run the hose and slave above the master with a clamp on the slave piston, bleed it that way and note whether or not you have a leak. and like bb says, use the proper fluid.
 
Can anybody tell me the size of the o-ring of the clutch slave piston?

In my sparepart list i can only find the complete piston.
 
Help needed!

Yesterday I had the failure the second time.
normaly I ride round a mx/enduro track.
Yesterday we go out in nature, up to a hill.
(I´m happy to have found a new friend for do such things)

Ok, we are in the woods, engine was hot (the fan was sometimes on) but no overheating and boiling.
ride uphill on a forrest road, nothing to do with the clutch, and as we stopped the clutch lever goes empty nearly the complete way.
We have to search the roads an go back to home.


After a few hundred meters the clutch was complete death - the reservour was empty.

Last weekend I was in my "home track" and nothing happend.

Take a look to my gallery, please:

The output cylinder has grooves. (bike has only 40 h)

flashy was although the nipple of the clutch pipe:
It seems a little bit leak.
The output cylinder has a conical sealing face, the nipple has a flat face?

Is here something wrong??

The O-ring of the piston is ok, not hard or damaged.
I use a transparent hydraulic oil, not the original magura blood.

Please help, this timebomb exploses now the second time and to at the worst-case timepoint.

regards,
husa98
 
Hi Husa98, im not sure if my bike and yours are the same setup but if i was in this situation i would personally remove the slave cylinder and fix something round it to stop the piston popping out. I would then top up the reservoir attach some string or a rubber band around the lever to create a pressure in the system and leave it over night with some white paper underneath then in the morning hopefully you will find your leak ! It would be easier if you removed the master/slave along with the line and laid it on the floor - less mess and easier time pinpointing the problem although you will have to create a 'handlebar' to tie around. Other than this suggestion i cant help technically but as far as i can see this should guarantee to highlight your leak. Its wierd that you cant see any fluid anywhere ....
 
I filled the output cylinder with fork oil 5W, fitted no new o-ring on the piston,
did a flat iron with al 10 mm hole over the piston and fixed it with two locking pliers.

Had good pressure, take a belt over the clutch lever to let the system under pressure the night.

Sometimes I pushed the lever additionally.

tomorrow I saw what I worried about:

Nothing!!

Not a little groove of leakage!

I mouted the cylinder to the engine and went for breakfast.

Remember:
Since May 2008 I had no problem with the clutch,no re-filling was needed all the time.

I have to take a little bottle with oil in my tool-bak (like a 2 stroke driver..)
 
The only thing i suspect is the oil.

Maybe it get´s to low viscosity at higher temp´s.

But when other here uses babyoil, forkoil, or any ATF (there are so many ATF´s, for older or newer gearings) it seems although implausible.

And as I told a friend (he has this oil in his factory) and I uses this oil since some years, he had never a problem with his 470 and I with my 501.


:? :? :?
 
I have to correct myself:

I can see a little leak from the breather screw.
When it is dirty and dusty, it is moistly around the M8 holescrew.

Tighten it much faster then it is and the thread will be damaged....
 
on the upside of the clutch cylinder(monted on the right side of the engine) ist the filling or breather hole screw.
The cone sealing seams ok, but I will try a new one.
 

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