S4/RS4 SAC pressure plates: How to check/set the SAC mechanism.
08-03-2005, 07:50 AM
#13
While it may be properly set prior to shipment,.....
being in a box, with the pressure plate "unloaded" as in, it's not installed on a flywheel, there's little to hold it in the proper setting. Vibrations from the UPS truck, while it's unloaded, or being dropped, can cause it to adjust slightly, and be in a semi-worn position.
08-03-2005, 07:58 AM
#15
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designing a method of holding the proper adjustment in place during shipment is the responsibility..
of the company that makes the product. At the very LEAST they should include instructions to make sure this is checked before installation. Unless I decide I can do this myself, I'm out the cost of another clutch job, another flywheel resurface, and possibly the cost of a new pressure plate.
08-03-2005, 08:38 AM
#16
AudiWorld Expert
yes....
Here is my clutch when new:
Notice the high side of the wedge is just showing at the left side of the holes (along the bottom side of pic):
<img src="http://ctny.audiworld.com/mark/s4/clutch/2_new/dsc04745.jpg">
and here it is when I pulled it out (now the low side of the wedge has come in from the right side of the holes (again, along the lower part of the pic):
<img src="http://ctny.audiworld.com/mark/s4/clutch/2_remove/dsc01557.jpg">
Close up:
<img src="http://ctny.audiworld.com/mark/s4/clutch/2_remove/dsc01559.jpg">
Notice the high side of the wedge is just showing at the left side of the holes (along the bottom side of pic):
<img src="http://ctny.audiworld.com/mark/s4/clutch/2_new/dsc04745.jpg">
and here it is when I pulled it out (now the low side of the wedge has come in from the right side of the holes (again, along the lower part of the pic):
<img src="http://ctny.audiworld.com/mark/s4/clutch/2_remove/dsc01557.jpg">
Close up:
<img src="http://ctny.audiworld.com/mark/s4/clutch/2_remove/dsc01559.jpg">
08-03-2005, 08:45 AM
#19
AudiWorld Expert
Good post Mat. I got rid of the SAC altogether to avoid all associated issues....
Some clutches have the SAC disabled to avoid them moving/adjusting during hard launches. In general, that is a good thing. Unfortunately, I had a SPEC clutch with it adjusted too far down when it was pinned. This caused a problem when trying to disengage with the new clutch.
Notice the 3 silver pin heads, which prevent adjusting. Also notice the wedge is already adjusted downwards as if there was some wear, but there was not. Thus too much engagement:
<img src="http://ctny.audiworld.com/mark/s4/clutch/3_remove/dsc01563.jpg">
Close-up of pin:
<img src="http://ctny.audiworld.com/mark/s4/clutch/3_remove/dsc01784.jpg">
I've since moved to a pressure plate design that does not have an SAC at all:
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc01984.jpg">
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc01985.jpg">
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc02028.jpg">
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc02029.jpg">
Notice the 3 silver pin heads, which prevent adjusting. Also notice the wedge is already adjusted downwards as if there was some wear, but there was not. Thus too much engagement:
<img src="http://ctny.audiworld.com/mark/s4/clutch/3_remove/dsc01563.jpg">
Close-up of pin:
<img src="http://ctny.audiworld.com/mark/s4/clutch/3_remove/dsc01784.jpg">
I've since moved to a pressure plate design that does not have an SAC at all:
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc01984.jpg">
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc01985.jpg">
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc02028.jpg">
<img src="http://ctny.audiworld.com/mark/s4/clutch/5_new/dsc02029.jpg">
