A lot is written about the clutch slave cylinder . Could someone please to me in total layman's terms what is the function of this piece of equipment so I can better understand my bike. Thank you
Holding a lever on a cable will not wear it out faster, nor will it wear out the slave faster. There is a small "throwout" bearing the rod rides in at the end of the slave piston. It is always spinning whether you have the clutch pulled in or released and it is always under some pressure. It just does not make any difference.tenrocky said:So ,just as holding the clutch lever in on a cable system will generally wear out the cable faster, will holding in the lever needlessly on this system wear out the slave cylinder quicker ?
+1 This one good habit to develop, along with keeping an eye in the rear view mirrors.jzeiler said:By the way I always stay in gear at the lights with the clutch pulled in - 71K and no issues so far.
It spins at whatever the engine RPM is, I consider this quite fast. Most standard electric motors only spin at 1,700-3,600 RPM, the LT engine idlesat around 1,750, and goes up to near 8,000.jzeiler said:Dennis,
It is a small bearing and when it does lock up it will spin the slave pistion. The diameter of the rod is tiny and you are right it does not spin fast -------------------------------.
It is a ball thrust bearing, not a radial bearing, I do not think there is a replacement bearing available, as it it pressed into the piston. It is about 12-14 mm outside diameter, from memory, have not measured one. The ball race is likely around 10mm diameter.K100Dennis said:David, my reference to the bearing speed is based on its diameter. "Fast" is a relative term only. I'm well aware of the potential engine rpm's, but this bearing is extremely small in diameter, so itssurface speed (m/min, ft/min) will be quite low. If someone can quote me the bearing number I can do some calcs on surface speeds and potential (theoretical) L10 life for the bearing. Remember, there is a point very close to the centre of every circle where there is virtually no velocity but there's plenty at the outside diameter. rpm's will always be the same though.
And, the bearing was not reallied "seized", as it still turned, but with a little roughness. It does not take much torque to spin a lubricated piston in a cylinder. The seal is probably the only real resistance to it turning. When the hard anodize coating is worn away by the turning, the seal is then destroyed as it moves over the ridges. The coating is only a couple thousandths thick, and the base aluminum is soft.K100Dennis said:Thanks for the info David, looking at it in the SKF General Catalogue, if it's a thrust ball bearing of your approximate OD it is possible that it's a BA-5 or a BA-6. It may of course be some modified derivative, as these things sometimes are when the OEM does a deal with the supplier of the parts. However, that bearing won't be a sealed type bearing (not possible for this type), so there is probably some dust seal arrangement built into the Magura assembly and the bearing has some lube applied during assembly, who knows. That being the case, it may be possible to get some fresh lube in there if one was serious about preventing the failure. For the record, both those bearings mentioned have designated limiting speeds of 24000 and 28000 rpm respectively. Man, the seizure sure does a number on the piston and cylinder !