[s-cars] drivetrain whir / clatter upon CMG install

Krasusky Paul (WQQ2PXK) WQQ2PXK at ups.com
Tue Nov 4 08:11:10 EST 2003

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Hoping to probe the collective technical minds here (i.e. Igor, Bob(s),
Keith, Scott TB, Ned, etc.).

After 3 or so weeks, and SPEC sending the wrong clutch (that went in, then
back out, of the f'n car), my CMG / NEA LWFW / SPEC II hybrid / short &
weighted shifter / new slave install is complete.  Drives f'n amazingly
(more on all that another day).

I'm getting some good drivetrain clatter in 2nd-6th gears when the car is
bogged.  Now I realize some 'whir' is normal due to the aluminum flywheel /
absence of dual mass.  But there's a noise at idle that bugs me.  Here's the

- At idle, with clutch pedal OUT, the 'whir' that the drivetrain makes (in
2nd-6th) can be manipulated by blipping the throttle...  producing a good
audible clatter.  Sounds like a loose heat shield type sound, but it's from
the bellhousing.  Sounds JUST like a throw out bearing 'whir' at idle (yes
it's new), until it clatters when I hit the gas... no TOB has ever done that
to me.

- Whir / clatter go totally away when clutch is depressed... silent.  Comes
right back when declutch.

- Cannot feel anything 'slapping around' in the bellhousing or tranny, put
hand on it, don't feel any knocking anywhere

- Nothing appears loose anywhere.

- Drives excellent, no noise as long as there is load on the drivetrain.
SPEC II not quite at 500 mile break in, skips off line in 1st and reverse
still (annoying, SPEC says will go away).

The CMG is a Kludge-redone unit, I'd *hope* to rule that out.  I'm
'guessing' maybe a loose spring on the clutch disc?  Or something similar?
Won't know unless I yank it, again...  as much as I like to yank I dread the
thought of doing this job "The Mahoney Way" (3x).  Looks like I'll have to
rope an unsuspecting Rossato into a weekend project this winter.  Yay!

Any thoughts / experiences greatly appreciated.  I have trouble thinking
"that's the way it's supposed to be"...  maybe the whir 2-6, but not the
idle clatter...  if it is, it's REAL embarrassing sounding, sounds like a
POS... no, not a Power Output Stage...


-Paul Blackthumb... it's always something
'95 //S6 drives like a real MUTHAF'ER at least, thoughts later

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