I forgot to remove the trailer the first time. Also meant to add that master
cylinder holds less than the capacity of the whole system and if the pedal
is pumped quickly a few times the reservoir will go dry and the system takes
for ever for the clutch to engage.
Here is a little tip on those late model slave cylinders. There is a small
orifice installed in the hydraulic line that slows clutch engagement. I
guess they didn't want anyone dumping the clutch. Several people I know
have
try to do a clutch upgrade only to have it wasted in a few hundred miles.
Once the orifice was found and drilled out the clutch life was greatly
improved.
Bill
> ----- Original Message -----
> From: <ardunbill@webtv.net>
> To: "Chuck Rothfuss" <crothfuss@coastalnet.com>;
<land-speed@autox.team.net>
> Sent: Sunday, July 29, 2001 10:00 AM
> Subject: Re: odd Chevy crank wear
>
>
> > Hi Chuck, very interesting case history. What did the customer do that
> > resulted in .080 wear on the crank thrust face? I think most people sit
> > at lights with the clutch pedal pushed in, so they can jump as soon as
> > it changes. And yet wear on the thrust face is not often mentioned.
> >
> > Since I put the Tilton internal hydraulic throwout system into #124 this
> > year, and it worked correctly at Maxton on June 30, it's encouraging to
> > hear GM's version apparently worked trouble-free for a tremendous
> > mileage in this case. Hope Tilton's is as good.
> >
> > Interesting that apparently shoving the whole crank/rods/pistons/etc
> > assembly forward and running it .080 ahead of the original position, for
> > a long mileage, didn't upset anything. Until the counterweights started
> > clunking on the main caps or whatever.
> >
> > With my 3200 lb clutch, holding the pedal in a long time at the starting
> > line last Sept at Maxton, because my linkage was faulty and the clutch
> > dragged badly, the original .003 play increased to about .015 because of
> > wear on the thrust faces (rear main bearing and/or crank, I didn't check
> > which). Of course the whole 3200 lbs spring pressure inside the clutch
> > doesn't push on the thrust bearing, only a fraction of that due to the
> > design of the fingers, what, maybe 1/4, but if 800 lbs, still a lot of
> > force. So one doesn't want to hold the clutch pedal in a second longer
> > than necessary. Fortunately, my new hydraulic throwout works (so far)
> > like a charm and there is no clutch drag whatsoever. I can conveniently
> > select first gear and go whenever the Starter says.
> >
> > Your final point reminds us that when we hear a thud-thud-thud noise in
> > our engines, check for helicopters first before getting upset. Cheers
> > Ardun Bill
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