bill wrote:
> This is interesting as I just did the opposite swap. The gizmo that threads
> onto the adjustable push rod disintegrated on me
Bill:
See attachment. My "gizmo" with its locknut is very sturdy, and I have
absolutely
no fear of it disintegrating. It's as robust as the stock push rod.
I had no idea that clutch cylinders with adjustable push rods were available
which
would be suitable for a roadster. I thought that the MC that I removed the push
rod from, was for a different car/model.
> I also had
> another adjustable push rod but decided not to chance another one going bad
> on me. There is a slightly different feel to the clutch now but at least I
> have a solid connection.
The adjustability IS the key for me! My clutch feels better than it has for a
long
time. I thought I had a bad 2nd gear synchro because I had to near synchronize
the
engine rpm, in order to downshift into 2nd. Now, no longer! Downshifts into
2nd
easily regardless of rpm.
My clutch had become badly out of adjustment and I didn't realize it until I
found
it was impossible to obtain the ~1/8th inch release bearing clearance, and
still be
able to shift - because of wear of the linkage. I'm aware that there are other
ways to reduce or eliminate the effects of the wear.
Do you have that clearance?
Dave
> > I was hopeful, but I wasn't exactly "overwhelmed" by the number of answers
>to
> > my question ;-). I'll share my findings.
> >
> > From the geometry of the linkage, and my own measurements of one SPL-311, I
> > calculated that the maximum (theoretical, no "slop") slave cylinder "throw"
> > should be 0.92 inches. Because of the 5/8" to 3/4" piston diameters of the
> > master and slave respectively. the slave moves 69.5% of the master movement.
> > Mine traveled about 9/16ths inch which was not sufficient to provide release
> > bearing clearance, and at the same time, sufficient "release" to allow non
> > interference, that is, "grindingless" shifting.
> >
> > In my spare parts, I had a "mystery" clutch master cylinder (also made by
> > Tokico) which was, in many respects, very similar to that which is stock in
> > the
> > SPL-311. It had a unique feature, an adjustable "push rod". (It is shown
>in
> > the "attachment", which will be "stripped" for List addressees. I will be
> > happy to supply to individuals if requested.)
> >
> > I modified this adjustable push rod so that it could be substituted to the
> > stock cylinder push rod, then installed the MC in the car.
> >
> > I adjusted this push rod so that it would start immediately moving hydraulic
> > fluid at the normal start position of the clutch pedal.
> >
> > Measurement of slave cylinder movement at full depression of the clutch
>pedal
> > was a throw of 3/4 inch. I figure that's about the "upper limit" of what
>the
> > slave cylinder "throw" should be.
> >
> > I returned slave cylinder clearance (to the release bearing) to be
> > approximately 1/8th inch, where I had set it when I did my last clutch
> > replacement. This clearance had apparently "gone away" over time, unnoticed
> > by
> > me.
> >
> > My clutch/shifting performance is greatly improved over what it has been
>for a
> > long time. (One of those things that gradually occurs and you don't realize
> > the amount of degradation, until you "fix it".)
> >
> > Dave
> > '68 1600
> > Kailua-Kona
[demime 0.99d.1 removed an attachment of type image/jpeg which had a name of
Adj. Pushrod]
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