[V8] squealing serp belt oddity

Tue Sep 25 06:47:08 PDT 2007

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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>>> === message truncated ===
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