Re: Before re-installing my motor what should I do to the tr

Posted by P and R Pete on May 31, 2011 at 15:59:27 from (173.86.54.223):

In Reply to: Before re-installing my motor what should I do to the tranny posted by GRAPE-DRANK on May 31, 2011 at 04:38:39:

And a quick clutch explanation...

This is how the rear of the flywheel looks- it has the pressure plate assembly bolted to it with 6 bolts around it's perimeter...



You can see three 'fingers'- it is upon these fingers that the throwout-bearing pushes, when the clutch pedal is depressed. Beneath the fingers, through the center hole of the pressure plate, you can see the clutch disc. The splines of the tranny shaft slide into the splines in the clutch disc. Thus, the clutch disc, spinning with the flywheel, 'drives' the tranny shaft.

Here's the clutch disc by itself. You can see the friction material riveted to this disc, and the splines in the middle...



Here's a picture of the flywheel without the pressure plate assembly.



Here's the part of the pressure plate that faces inward.

With the clutch pedal OUT, this pressure plate, under strong spring pressure, traps the clutch disc between the pressure plate and the central surface of the flywheel. This action ENTRAPS the clutch disc, so that when the flywheel rotates, the clutch disc must also rotate, which powers the tranny.



The fingers pivot near their center. When the throw-out bearing pushes the inner part of the fingers toward the flywheel, the outer part of the fingers pull the pressure plate AWAY from the clutch disc. This allows the clutch disc to remain STILL, while the flywheel and pressure plate continue to spin. With the clutch disc NOT ROTATING, you are now able to shift. WHen you release the clutch pedal, and the throw-out bearing retreats off the fingers, the pressure plate again squeezes the clutch disc against the flywheel, and the tranny is under power.

It is this clutch disc that can wear out, and which thus causes CLUTCH SLIPPAGE. Or, these get coated with oil, also contributing to slippage. Or, the pressure plate gets warped. This was the case with my pressure plate above- you can see that it was grabbing in only 3 spots, and not over it's entire circumference.

Again, for the relative cheapness of these parts, I join the others in recommending that you consider the health of the clutch disc, and the condition and surface of the pressure plate, and the surface of the flywheel. My picture above, of my flywheel, shows how it was resurfaced so that it was absolutely flat.

One last thing- in the rear of the crankshaft, internally, is a small bearing/bushing. The tranny shaft, that goes through the middle of the throw-out bearing and the pressure plate and the flywheel, comes to rest within this bearing/bushing. This is what keeps the tranny shaft runnig straight and true, or it would be flopping around as it spins. Definitely consider replacing this piece in the crankshaft.

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