[V8] clutch

[Scott Justusson]

 Rule #1:  New does not mean known-good
Rule #2:  Known-good is better than new.  See Rule 1
Rule #3:  If a symptom points to a new part - see Rule 2

Dave:
Without any other reading than the pedal, this says slave cylinder or air in the lines.  For slave, I bench bleed all slave cylinders prior to install. I also use a Snap-on pressure bleeder to bleed.

Test:  Take your hand and manually pump the clutch pedal 50 times, to the floor and bring it back up manually.  Crack the bleeder screw at the slave.  Does it burp with the release of the built up line pressure?  If not, likely bad slave.  OR, you haven't gotten all the air out, or there is a leak.

It's possible you have bent/faulty tines in the clutch PP.  Can you get the clutch to actually release?  Normally, I see Clutch to the floor with nothing as Master, clutch almost to the floor with something as slave, and no clutch release at all as faulty tines.  The only other thing I've seen only once, was a similar problem on a  'miss' of the TOB fork detent installing the slave.  

HTH

Scott J
92 v8 ABT Chipped

 

 

-----Original Message-----
From: Dave Saad <dsaad at icehouse.net>
To: audi fan <v8 at audifans.com>
Sent: Wed, Nov 23, 2011 9:58 pm
Subject: [V8] clutch


well - this sucks.
My clutch stopped releasing fully just a few days after I got the new rack 
installed.  I hoped it was some sort of hydraulic problem - and it looked good 
for a while that it was.  The master had a broken internal spring, and the hose 
was looking like it might be stretching a little so I replaced both.  The slave 
is good.  Still no go.  I can't imagine what might have gone wrong with the 
clutch to cause this.  It made no sound.  It just won't release all the way.  It 
was replaced about 70K miles ago.  The symptom is the pedal feels a little soft, 
and is most of the way down before it starts to really feel like it is doing any 
work.

I have tried bleeding the system every way I can think of and am (99.46%) 
certain it is not that.  This is a real PITA to do by the way.  I think the 
easiest way to bleed the clutch is to hang the car by the back bumper with a 
crane so the air bubbles go to the top of the slave.  What I really ended up 
doing was bleeding the system with the slave off the transmission and turned 
vertical.  This of course made installing the slave lots of fun since you have 
to compress it with your pinky while installing the bolt with your tongue - all 
while blindfolded.  I hope DOT4 is not poisonous.

So - it looks like I will be pulling a motor real soon.  In the meantime of 
course I am driving my beat up old '83 ranger with who knows how many hundreds 
of thousands of miles on it.  It still has all original hydraulic parts for both 
clutch and brakes.  It would still have the original clutch too except I changed 
it a few years ago because I was towing my trailer and just could not believe it 
was still good.  It was.

Grrrr

Dave



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