[V8] squealing serp belt oddity

Tue Sep 25 06:49:41 PDT 2007

....Which would explain why Keith swapped crank pulleys when he did the motor swap...  yes, I definitely need to drop by mom's (where the old motor is sitting) and see if the crank pulley / dampener is still there.

> -----Original Message-----
> From: Ingo Rautenberg [mailto:ingo.rautenberg at gmail.com]
> Sent: Tuesday, September 25, 2007 9:47 AM
> To: Coleman, David
> Cc: Scott Simmons; urq; v8 at audifans.com
> Subject: Re: [V8] squealing serp belt oddity
> 
> Dave,
> 
> The ONLY difference I can see is that each has a different part No.
> for the front dampener/pully assembly.  Perhaps Ron can measure the
> various ones he has to confirm. If I had to guess, the 5 speed likely
> has the smallest diameter and the 4.2 has the largest diameter.
> 
> Ingo
> 
> On Sep 25, 2007, at 9:24 AM, Coleman, David wrote:
> 
> > That question was keeping me up last night as well -- but the car's
> > under a cover, and I was just too ding dang tired to uncover and
> > scour around for an answer.
> >
> > I'm guessing the different trans requires a different AC or
> > alternator mount configuration, moving the pulley closer inward.
> >
> >
> >
> >
> >
> >> -----Original Message-----
> >> From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On
> >> Behalf Of
> >> Scott Simmons
> >> Sent: Tuesday, September 25, 2007 2:04 AM
> >> To: urq
> >> Cc: v8 at audifans.com
> >> Subject: Re: [V8] squealing serp belt oddity
> >>
> >> Why is there a difference between auto and manual?  The difference of
> >> 30mm isn't much.
> >>
> >>
> >>
> >> urq wrote:
> >>
> >>> TFA indicates the following lengths:
> >>>
> >>>    PT Automatic  - 2460mm
> >>>    PT Manual     - 2433mm
> >>>    ABH Automatic - 2480mm
> >>>
> >>> HTH!
> >>> Steve B
> >>> San José, CA (USA)
> >>>
> >>> -----Original Message-----
> >>> From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On
> >>> Behalf
> >> Of
> >>> Ron Wainwright
> >>> Sent: Monday, September 24, 2007 1:09 PM
> >>> To: Coleman, David
> >>> Cc: v8 at audifans.com
> >>> Subject: Re: [V8] squealing serp belt oddity
> >>>
> >>> Not sure. They looked the same when I was doing
> >>> George's swap. I think I used the 4.2 pully in any
> >>> event.
> >>>
> >>> But find out which pully you have Dave.
> >>> & not sure if the 3.6 too 4.2 Auto belts are the
> >>> same...but I do know the Manual 3.6 belt is shorter.
> >>>
> >>> Ron
> >>>
> >>> --- "Coleman, David" <David.Coleman at blackrock.com>
> >>> wrote:
> >>>
> >>>
> >>>
> >>>> Is there an easy way to tell the pulleys (3.6, 4.2,
> >>>> manual, automatic)
> >>>> apart?
> >>>>
> >>>> I still have a pulley on my old motor; I'll have to
> >>>> run out to see if
> >>>> it's still torqued down.
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>> -----Original Message-----
> >>>>> From: Ron Wainwright [mailto:ron_01056 at yahoo.com]
> >>>>> Sent: Monday, September 24, 2007 4:00 PM
> >>>>> To: Coleman, David
> >>>>> Cc: v8 at audifans.com
> >>>>> Subject: Re: [V8] squealing serp belt oddity
> >>>>>
> >>>>> So if he used the 3.6 pully from you'r old 3.6
> >>>>>
> >>>>>
> >>>> motor
> >>>>
> >>>>
> >>>>> than you need the Manual belt.
> >>>>> Conti part#, 6K2433.
> >>>>>
> >>>>> Ron
> >>>>>
> >>>>> --- "Coleman, David" <David.Coleman at blackrock.com>
> >>>>> wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Alignment double and triple checked.   And every
> >>>>>> pulley spins freely.
> >>>>>>
> >>>>>> Interesting note on the belt size... I believe I
> >>>>>> have the right size, as
> >>>>>> the first one I got was too big.  I thought that
> >>>>>>
> >>>>>>
> >>>> was
> >>>>
> >>>>
> >>>>>> due to the crank
> >>>>>> pulley size difference between 3.6 and 4.2.
> >>>>>> Perhaps there's a smaller
> >>>>>> one still, the one for the 5-speed?  Does that
> >>>>>>
> >>>>>>
> >>>> mean
> >>>>
> >>>>
> >>>>>> there are three
> >>>>>> different belt applications for the V8?
> >>>>>>
> >>>>>> Regarding the above, by the way, I believe the
> >>>>>>
> >>>>>>
> >>>> 3.6
> >>>>
> >>>>
> >>>>>> crank pulley was used
> >>>>>> when Keith swapped the 4.2 motor...
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> -----Original Message-----
> >>>>>>> From: Ingo Rautenberg
> >>>>>>>
> >>>>>>>
> >>>>>> [mailto:ingo.rautenberg at gmail.com]
> >>>>>>
> >>>>>>
> >>>>>>> Sent: Monday, September 24, 2007 2:13 PM
> >>>>>>> To: Coleman, David
> >>>>>>> Cc: v8 at audifans.com
> >>>>>>> Subject: Re: [V8] squealing serp belt oddity
> >>>>>>>
> >>>>>>> IMO there is obviously something that either
> >>>>>>>
> >>>>>>>
> >>>> isn't
> >>>>
> >>>>
> >>>>>> aligned properly
> >>>>>>
> >>>>>>
> >>>>>>> (doubt it) or one of your accessories is
> >>>>>>>
> >>>>>>>
> >>>> putting a
> >>>>
> >>>>
> >>>>>> severe drag
> >>>>>>
> >>>>>>
> >>>>>>> relative to everything else.  A/C clutch
> >>>>>>>
> >>>>>>>
> >>>> going/
> >>>>
> >>>>
> >>>>>> compressor seizing?
> >>>>>>
> >>>>>>
> >>>>>>> PS:  You DO have the correct size belt, right?
> >>>>>>>
> >>>>>>>
> >>>>>> There are two sizes -
> >>>>>>
> >>>>>>
> >>>>>>> I believe the automatic is bigger and the
> >>>>>>>
> >>>>>>>
> >>>> 5-speed
> >>>>
> >>>>
> >>>>>> is shorter (forget
> >>>>>>
> >>>>>>
> >>>>>>> why) -- at least on the 5-speed.
> >>>>>>>
> >>>>>>> Ingo
> >>>>>>>
> >>>>>>> On Sep 24, 2007, at 12:51 PM, Coleman, David
> >>>>>>>
> >>>>>>>
> >>>>>> wrote:
> >>>>>>
> >>>>>>
> >>>>>>>> SO - My '91 5-speed with 4.2 has been
> >>>>>>>>
> >>>>>>>>
> >>>> enduring a
> >>>>
> >>>>
> >>>>>> squealing
> >>>>>> serpentine
> >>>>>>
> >>>>>>
> >>>>>>>> belt for several months.  In a nutshell:
> >>>>>>>>
> >>>>>>>> *       It started squealing only at idle,
> >>>>>>>>
> >>>>>>>>
> >>>> and
> >>>>
> >>>>
> >>>>>> would go away with
> >>>>>>
> >>>>>>
> >>>>>>>> higher
> >>>>>>>> RPMs
> >>>>>>>>
> >>>>>>>> *       Broke under load, nursed back home,
> >>>>>>>>
> >>>>>>>>
> >>>>>> replaced with new, still
> >>>>>>
> >>>>>>
> >>>>>>>> squealed
> >>>>>>>>
> >>>>>>>> *       Replaced the coil spring behind
> >>>>>>>>
> >>>>>>>>
> >>>> t-belt
> >>>>
> >>>>
> >>>>>> cover with known good
> >>>>>>
> >>>>>>
> >>>>>>>> used; squealing stopped for a month or so
> >>>>>>>>
> >>>>>>>> *       Started squealing again, this time
> >>>>>>>>
> >>>>>>>>
> >>>> more
> >>>>
> >>>>
> >>>>>> apparent with higher
> >>>>>>
> >>>>>>
> >>>>>>>> RPMs; nearly silent at idle.
> >>>>>>>>
> >>>>>>>> *       Replaced shock absorber / tensioner
> >>>>>>>>
> >>>>>>>>
> >>>> with
> >>>>
> >>>>
> >>>>>> factory new;
> >>>>>> squeals
> >>>>>>
> >>>>>>
> >>>>>>>> like a mofo still.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> The shock tensioner is fully compressed
> >>>>>>>>
> >>>>>>>>
> >>>> (i.e.
> >>>>
> >>>>
> >>>>>> can't make the belt
> >>>>>> any
> >>>>>>
> >>>>>>
> >>>>>>>> tighter), yet under load, I can watch from
> >>>>>>>>
> >>>>>>>>
> >>>>>> underneath the belt walk
> >>>>>>
> >>>>>>
> >>>>>>>> back
> >>>>>>>> and forth across the lower idler pulley -
> >>>>>>>>
> >>>>>>>>
> >>>> like
> >>>>
> >>>>
> >>>>>> the belt is just
> >>>>>> still
> >>>>>>
> >>>>>>
> >>>>>>>> too loose.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> Does anyone know if any of the pulleys
> >>>>>>>>
> >>>>>>>>
> >>>> (aside
> >>>>
> >>>>
> >>>>>> from the harmonic
> >>>>>>
> >>>>>>
> >>>>>>>> balancer
> >>>>>>>> / crank) are different sizes from 3.6 to
> >>>>>>>>
> >>>>>>>>
> >>>> 4.2?
> >>>>
> >>>>
> >>>>>> The 4.2 belt is way
> >>>>>>
> >>>>>>
> >>>>>>>> too
> >>>>>>>> big; the 3.6 belt is the one in question.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> If no one knows about the pulley sizes,
> >>>>>>>>
> >>>>>>>>
> >>>> perhaps
> >>>>
> >>>>
> >>>>>> the Gates number
> >>>>>>
> >>>>>>
> >>>>>>>> for the
> >>>>>>>> next smaller size???
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> Any ideas welcome!
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> -DaveC.  (nice car except it's embarrassing
> >>>>>>>>
> >>>>>>>>
> >>>> to
> >>>>
> >>>>
> >>>>>> drive)
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> >>>>>>
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