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Leaky clutch master cylinder cover

Phang

Phang

Cruisin' Guzzisti
GT Contributor
Joined
Jun 16, 2009
Messages
388
Location
Singapore
I just came back from a ride, bike (Griso SE) has 1700km on the odometer. When I stopped to fill it up at the gas station, I noticed some fluid around the cover of the clutch master cylinder. Amazingly none has dripped on the painted body panels… pheeew.. :sick:

When I took off the reservoir cover, the rubber diaphragm and the underside of the cover was wet with brake fluid. Fluid level was at the top of the sight glass with bike on the side stand and handle bar full lock to the right.

I have inspected the reservoir cover, looks good. Rubber diaphragm has no sign of torn or crack, mating surface of the reservoir looks good too.

I cleaned and dried the cover, diaphragm and the master cylinder mating surface, put everything back, and tighten the cover screws alternately with just enough pressure to compress the diaphragm. Should I hope for the best it will not leak again? What else can I do to prevent it from leaking again? Should I replace the rubber diaphragm?

Another question, as the clutch wears the fluid level in the master cylinder will raise or drop? On my R1150R, the fluid level will raise as the clutch wears.

Cheers,
Phang
 
I believe the Guzzi clutch fluid level will also increase (rise) as the clutch wears. Most hydro clutches work that way.
Did you remove a tiny bit of fluid before putting it back together? It sounds like it might be over filled.
 
Yes, I have adjusted the fluid level before I put everything back together. I syringed out a cc (cubic centimeter) or two so that fluid level is visible through the tiny sight glass now.
 
A few have had similar issue on 1200 Sports. I have, and my master cylinder is currently getting replaced since it lost some paint.

So many of us have done something like this

If you have access to a phillips screwdriver (No 2) and a stanley knife. Simply take the cover off, find a piece of cardboard of a similar thickness to say the soft cover of a book, cut out the cardboard to the same shape as the cover, put it into the cover's groove (on top of the rubber moulding), and reassemble. As long as the cardboard is of a reasonable thickness (say around 10 thou), this put enough pressure on the rubber membrane to stop the leak.
Click to expand...

Perhaps that may help you.
 
Appreciate the tips Mal.

Some updates on the clutch master cylinder, no leak since the last time I cleaned and put everything back but I still tie a piece of cloth around the clutch M/C as a diaper when I park the bike, just in case it leaks again.
 
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