CLUTCH SLIPPAGE

What would you notice when your clutch disc has already become thin.
Why does your car seems to have difficulty in accelerating despite your engine  is proven  to be in good condition and your brake shoe is not in lock position .

The clutch disc( circular in form with a center hole with spline)  is placed in between the flywheel ( likewise circular  attached to the rear end of the crankshaft, ) and the pressure plate( circular in form)   is bolted to the edge of the flywheel.  Figuring it , clutch  is sandwitched between the flywheel and the pressure plate.
The center of the clutch has a hole or opening with a spline , in this opening , the shaft of the transmission (which has also a spline matched to the spline of the clutch disc) is placed.

when the engine runs, the flywheel , the pressure plate both rotates, since the clutch disc , though not bolted to the flywheel nor to the pressure plate would similarly rotates because it is sandwitched  tightly to the flywheel and pressure plate.  now since the transmission shaft is locked to the spline of the clutch disc, the moment the clutchdisc rotates the transmission shaft rotates also, hence,  if the transmission is engaged to its  gear the car will run.

that is why if you will imagine that there is no clutch disc installed ,  a shift to first gear  the car will not move  even if the transmission is engaged because the rotation of the flywheel is not transferred to the transmission shaft , similarly if the clutch disc is already too thin, that means it is not anymore rotating with the same tempo of the flywheel then the transmission will also be slow , hence the engine runs normally but the car does not run well  due to slippage.

what would you notice if your clutch slips.
1. the car does not move faster despite  you step hard on the gas pedal thereby hearing the roaring of the car engine but the car does not move faster .
2. your car seems to have difficulty in climbing even an slightly steep road, especially if you are in third gear. 

 Based on my experience and test made, to be sure if the clutch disc is really used up,  I SHIFTED THE GEAR TO 3RD GEAR instead of first gear, then try to make the car runs. IF  the engine stops to run, then your clutch is still OK,  if  your engine continues to run despite the gear is in place  then it proves that the clutch is slipping. 

why would the engine still run  not the car  this is so, because, if your clutch disc is almost used up or it is already thin, the rotation of the flywheel thru the engine will not be transferred to the clutch disc because the disc is not anymore in contact to the flywheel but since the main shaft of the transmission is connected to the clutch disc the ENGINE  will still continue to run and will not stall   despite that the gear is in the 3RD  gear.

If the you put your gear in 3RD  gear instead of the first gear and try to run the car, the engine will stop because the 3rd gear is too weak to sustain the power of the engine  especially if your clutch disc is still okay, but if your clutch disc is already very very thin, the 3rd gear cannot anymore feel the power of the engine because the clutch disc where this transmission shaft is attached is already sliding or its almost not rotating with the same tempo of the flywheel.