<VV> Topic: Odd noise and pressure plate

Wed May 21 21:51:52 EDT 2014

Did you install washers on the outer bolts which holds the bellhousing to
the crankcase ?
Sometimes the bolts' heads can touch the flywheel. Same with loosened
bolts. 

Daniel Monasterio

On 21/05/14 16:07, "Brian via VirtualVairs" <virtualvairs at corvair.org>
wrote:

>hen the car is in gear, the fingers on the pressure plate aren't touching
>anything.  Yet as I drive the car, there is a very pronounced knocking
>noise.  The balancer has not slipped.  All bearings were measured and
>correct bearings installed.  Ring gap measured correctly.  Entire
>assembly---crank, pressure plate and flywheel --balanced.  Engine torn
>down twice but nothing found.  Engine vibrates badly.  Pulls like crazy.
>No smoke.  I'm bewildered and frustrated.
>
>---------- Original Message ----------
>From: MarK Durham via VirtualVairs <virtualvairs at corvair.org>
>To: Ken Schifftner <scrubbr at ix.netcom.com>
>Cc: virtualvairs at corvair.org
>Subject: Re: <VV> Topic: Odd noise and pressure plate
>Date: Wed, 21 May 2014 12:46:29 -0700
>
>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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