Re: 5KCST Harmonic vibration-help

["Sean Ford" <sean@nwh.org>]

I've been gone for a few days, so forgive me if this thread is a done deal,
but.... I LOVE IT! I've been complaining of the same vibration since the car
was new. 1800 rpm, and also 2700 - 3000 rpm, and more recently discovered,
4800 rpm. I had the V6 TSB performed for the 1800 rpm vibration... cat
alignment... didn't work. Please keep the list informed of any and all
attempts to fix this problem. I, for one, will be watching this thread very,
very closely.

Sean Ford
sean@nwh.org                        '92 Audi 100CS 5spd 27K mi
Newton-Wellesley Hospital      '89 Suzuki Katana 600 14K mi
Newton, MA  02162 (USA)      http://www.geocities.com/MotorCity/Downs/5528

-----Original Message-----
From: Sherry & Chuck Clark <clark@rmi.net>


>> Chad,
>>
>> > My '87 5k Tq recently had both
>> > motor mounts replaced but none of the exhaust was moved in doing this
>> > repair. Everything seemed fine and then about a week later I noticed
that
>> > at exactly 1800 rpm, there is a harmonic vibration that came about.
>>
>> I don't know how many models this applies to, but my Bentley says that
>> the exhaust supports must be tightened when the system is hot.  Other-
>> wise a rumbling sound may be produced.  These systems have rubber
>> hangers on the rear (so no adjustment there) and are hard mounted with
>> a bracket on the transmission (tighten here).  Changing the engine
>> mounts would change the position of the engine.  Were the engine
>> mounts tightened when the engine was idling?  If not, the position of
>> the engine could be a little "off".
>>
>> Don Hoefer
>> '82 Coupe
>>
>>
>      Thanks Don and to others that have suggested this. It didn't really
>occur to me that yes I have changed the position of the engine-quite higher
>than it used to be. I'll try this and let you know. Thanks again,
>
>Chad Clark '87 5k Tq
>