Crank Pulley Wobble (was Re: [Shotimes] RE: Re: Alternator)

[Carl Prochilo]

Put the car back together a second time.  This time I had some good sun
shining into the motor and after I started the car and drove it around, I
found that there is a definite slight wobble in the crank pulley.  I can
see that the wobble might be enough under certain conditions, like the
belt not being on tight enough originally, to hop off the pulley.

So at this point the car will no longer be driven until this is taken care
of.  My initial plan is to get both belts off and then attempt to pull the
crank pulley (crankshaft damper assembly according to the service manual)
off to see if the harmonic balancer has failed or something worse is going
on.
-- 
Cheers,
Carl Prochilo
92 Ultra Red Crimson

On Wed, March 16, 2005 9:27 am, Zach Leahy said:
> a rough gauge of how tight to make the belt should be this:  You
> should be able to twist the belt about 90 degrees on the longest
> straight section.  too little tension and the belt will slip on A/C
> engagement (or hop offf), too much and it will damage bearings in
> components.  There is a pretty big window though, and you should not
> have a problem getting it in there w/o a gauge.
>
> There should be a lip on all the pulleys to keep the belt on, is that
> present and undamaged?  This is turning out to be an interesting
> problem.
>
>
> Z
>
> On Wed, 16 Mar 2005 08:48:56 -0500 (Eastern Standard Time), Carl
> Prochilo <gr8sho@prochilo.myserver.org> wrote:
>> I replaced the belt yesterday after I inspected all the pulleys, which
>> all
>> (idler, AC and ALT) spin freely.  Car started right up and ran fine.  AC
>> blows cold, system was charging from best I could tell.  At some point
>> yesterday, the new belt jumped off again!!  No visible signs of damage.
>> I
>> had one guy take a quick look at it.  He came up with the same
>> observations I had about the pulleys spinning freely.  So either I
>> didn't
>> tighten the belt enough, possible since I didn't have a tension
>> measurement tool handy, or there's something else amiss like the crank
>> pulley might have an issue that I can't detect.
>> --
>> Cheers,
>> Carl Prochilo
>> 92 Ultra Red Crimson
>>
>> On Tue, March 15, 2005 4:27 pm, Leigh Smith said:
>> >>Carl;
>> > Since your description mentions a "lurching" sensation, I would
>> > investigate
>> > to see what caused the belt to tear. Could have been some object
>> jammed in
>> > there (you should see evidence) or more likely a bearing on some
>> component
>> > died.
>> > Make sure the altenator and any other bearing on the same belt spin
>> > freely!!
>> > ..
>> > At 200k mi, why don't you unbolt the altenator and have you or a
>> rebuild
>> > shop put in $10 worth of brushes? They can't & won't last much longer!
>> I
>> > strongly recommend keeping your unit, unless the rotor/stator is
>> trashed.
>> > You'll be miles ahead keeping your known good core unit (with new
>> brushes)
>> > than buying a "rebuilt" unit from AZ with unknown core quality.
>> > Lee
>> >
>> >
>> >  But now the problem turns out to be the alternator belt has come off.
>>  I
>> >> think that the PS and alternator are on two separate circuits.  There
>> is
>> >> a
>> >> 1/8" tear in the old belt.  I am going to put the thing back together
>> to
>> >> see if there are any other issues.  All the pulleys appear to be
>> fine.
>> >> --
>> >> Cheers,
>> >> Carl Prochilo
>> >> 92 Ultra Red Crimson
>> >
>> >
>> >>>The alternator in the 92 finally gave out this morning with a little
>> >> >> >>better than 215K miles.  Part of the reason it died was a self
>> >> >> inflicted
>> >> >> >>wound I imposed on it.  When it failed this morning, it was like
>> >> the
>> >> >> car
>> >> >> >>lurched forward as if someone was holding the car back and then
>> let
>> >> >> go.
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