<VV> Topic: Odd noise and pressure plate

[Sethracer at aol.com]

When I read the starting message of this thread, I wondered whether the  
clutch disc was installed in this motor. With the clutch disc installed and  
aligned, it should be balanced, if the flywheel is still has tight rivets or 
has  been bolted. So, if the engine was built up, before putting it on the 
stand, was  the centering tool used to align the disc? Even if done during 
assembly, there  is nothing but the clamping force of the pressure plate to 
keep it there, now  that the input shaft or alignment tool was removed.
 
-Seth
 
 
In a message dated 5/21/2014 12:46:41 P.M. Pacific Daylight Time,  
virtualvairs at corvair.org writes:

Ken,  when you torque down a pressure plate all of the fingers should be the
same  height so the throwout bearing can ride on all of them at the same
time.  Also, the fingers should form a concentric hole that the t/o bearing
shaft  fits into. I suggest the plate be inspected. Also, I would take a
good look  at the harmonic balancer to make sure it has not started to come
apart. A  out of balance pressure plate will cause the balancer to fail
because it is  not designed to take those stresses.

Mark Durham Hauser Idaho
62  2Door Coupe 4speed Red/Red
On May 21, 2014 9:20 AM, "Ken Schifftner via  VirtualVairs" <
virtualvairs at corvair.org> wrote:

>  Gang:
>
> I recently was part of a crew that ran a rebuilt 140hp  on an engine stand
> wherein the flywheel and pressure plate was exposed  (just engine, bell
> housing, no transaxle). The engine had, when  installed in the car, an odd
> rattle...random, not rhythmic. On the  stand, there was perhaps some of 
the
> noise but not like the noise was  when installed.
>
> While looking at the running engine from the  point of view that the
> throwout bearing would have (if said bearing  were installed), the 
pressure
> plate fingers were not cycling as if  they had a common center. In other
> words, if you tried to put a pipe  (or the like) on the same centerline as
> the crankshaft bushing, some  of the fingers would hit. It was almost like
> some of the fingers were  loose and centrifugal force was spreading them,
> while others didn't  want to move. If the throwout bearing were to be
> installed, the  fingers would not touch smoothly on the bearing but 
instead
> be  eccentric and make like a polishing motion rather like a rotating  
motion
> (I hope I described this OK).
>
> Having never seen  a running engine from this vantage point, I don't know
> if what I saw  is "normal", "abnormal", or "panic inducing".  I'm thinking
> that  the pressure plate may be shot...or at least has weak springs.   The
> flywheel seemed to be running smoothly however. Loose  rivets?
>
> Other oddity. When using a timing light that provides  a strobe like 
effect
> and shooting it towards the harmonic balancer,  the image was
> fluttering....usually the image is fairly steady. Maybe  the two things 
are
> related, I don't know.
>
>
> Ken  Schifftner
>
> Kenneth Schifftner, Consultant, LLC
> 210  Indian Hollow Court
> Mahwah, NJ 07430
>
> 201-236-0786  hm/bz
> 201-749-3063 cell
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