Removing transmission, proving Buds statements

From : marsh monster

Q: thats not possible. the clutch will not apply under any scenario resulting from an improperly bled system. try reading what budd said. he mentioned nothing about the clutch. simply said that an improperly bled system could result in faster than normal throwout bearing wear. that is not only possible its probable. i am not sure that this is exactly what budd either said or meant but if you actually believe this max prove it because in reality you are dead wrong. there is no way in hell that an improperly bled system could cause excessive wear to the bearing but it is highly probable to cause excessive wear to the clutch. i dont claim to be a hydraulics expert but there are some simple facts that seem to be completely distorted. no tom it depends on the volume of air left in the system. on hydraulic machinery in the muffler factory ive seen a 3 dia by 24 cylinder full of hot air bend a 3 exhaust pipe with a laminated wall 0.072 thick . . . ..the heat coming from an oil based fire below the cylinder. i think that you are comparing two different systems. the cylinder that you are talking about was in a closed system which gave the building pressure no where to go so it pushed the piston out with enough force to bend the pipe. in a hydraulic clutch when the pedal is fully released it is effectively an open system and any expansion of either gas or fluid will simply dump the excess into the reservoir without building any pressure by design. yeah the set-up man lost his position because of poor housekeeping. and if the fire was as unintentional as you make it sound he should have. then dont forget that all the power your engines make comes from coffee can sized volumes of air heated by burning fuel. while true you are dealing with both combustion and a closed system neither of which exist in a hydraulic clutch at rest. first of all gas liquid and solids all expand to some degree when heated with the difference being that liquids and solids apply extreme pressure when any expansion occurs and gasses do not unless the expansion is significant. the reason why there is a slight gap required in a mechanical clutch linkage is due to the possible expansion of the mechanical parts partially engaging the clutch and causing excessive wear and slippage to the clutch not the bearing. the return spring serves to stop the linkage from rattling when in full release due to the required gap as much as anything else. and thats why there needs to be a gap on the hydraulic system if the hydraulic clutch master cylinder is functioning properly no gap will be needed as any change due to expansion or contraction should be dealt with by pushing excess fluid or pulling required fluid from the reservoir in the open at rest system. as for gravity the weight of the fluid is so insignificant in a 3/16 line that i doubt that it could supply enough force to even move the clutch slave cylinder at all never mind move it with enough force to cause excessive wear on the bearing. air in the system will also not cause the slave cylinder to move because if it expands all it will do is push the fluid back into the master cylinder reservoir as at full release the ports between the master cylinder and the reservoir are open pretty much just like the brake master cylinder. it does however have the ability to cause excessive clutch wear because it could prevent the clutch slave cylinder from moving enough to fully disengage the clutch when required due to its compressibility. as for the bearing wear i would think that it goes through as much wear sitting at a single traffic light while holding the clutch in as it does with a year of wear with the light to non-existent pressure being placed on it during normal driving when the clutch is fully engaged. it sounds like the op simply has a bad bearing possibly contaminated with dirt during assembly causing excessive wear and premature failure. now that could be a possibility. i would think the most likely one but then again not the only one. the op also didnt mention if he drives with his foot on the clutch pedal which would as you indicated also cause excessive wear of the to bearing. -- if at first you dont succeed youre not cut out for skydiving .