[DeTomaso] Techno question: a fine mess--update II

John Taphorn jtaphorn at kingwoodcable.com
Sun Oct 11 21:53:02 EDT 2015 

I second Will's doubt of the balancer and suggestion that you check the 
carb gasket or other possible vacuum leak.

JT

On 10/11/2015 1:05 PM, Will Kooiman wrote:
> I don¹t see how a balancer could cause a howling or a squeal.
>
> I had a weird squeal once, and it turned out to be the carburetor gasket.
> There was a leak under the carburetor, and the gasket was vibrating like a
> reed in a flute. It sounded like it was coming from the timing chain.  I
> tore the front of the engine apart, changed the timing chain, belts, fuel
> pump, etc.  I didn¹t find the problem until I was feeling around under the
> carburetor while the engine was running.  I could feel the gasket
> vibrating, and if I touched it, the sound stopped.
>
> What was the last thing changed before the sound started?
>
> On 10/11/15, 1:03 PM, "DeTomaso on behalf of Asa Jay Laughton"
> <detomaso-bounces at poca.com on behalf of asajay at asajay.com> wrote:
>
>>    I'm not liking where this is going.  I'd remove the balancer and run
>>    it.  You might get a little oil splash past the seal but I honestly
>>    don't see how it could be the balancer.  I'm beginning to fear its more
>>    dastardly, like a main or rod bearing or thrust bearing on the cam.
>>    Trouble is I don't think you can get the balancer off.
>>    Asa
>>    Sent using Jedi Mind Tricks
>>
>>    Charles Engles <cengles at cox.net> wrote:
>>    Dear Bill and Asa, et al,
>>               Test drive without the AC belt still showed noise.   While
>>    the engine was still warm, I removed the alternator belt.  To my
>>    surprise, the chirpy noise is still there.  The garden hose stethoscope
>>    seemed to show that it was maximal within the bowl of the crank
>>    pulley.   Hmmm???  No noise from the oil pan nor water pump
>>    (obviously).
>>               Next, I removed the crank pulley and the noise is still
>>    chirping away.   I checked again that the balancer isn't hitting
>>    anything on its backside and a wire hanger feeler shows nothing between
>>    the back of the balancer and the front cover or oil pan.
>>               Next, I could only imagine that I had somehow not torque the
>>    balancer bolt well and that it was loose.  Sorry, it is tight and I am
>>    sure that it has a dose of anti seize and the correct torque.
>>               The balancer is a BHJ and is about nine years old with about
>>    10k miles.  It looks good.  It was recently out and reinstalled last
>>    year before the Houston Rally.  No noise was noticed until afterwards
>>    while driving "normally" in town, etc.   Sounded like a belt, but it
>>    isn't all belt noise.
>>               I suppose the next step would be to loosen the balancer
>>    bolt, again apply a touch of antiseize if it looks like it needs it and
>>    then retorque.
>>                         Warmest regards, Chuck Engles
>>    -----Original Message-----
>>    From: bill gaino [mailto:gaino at earthlink.net]
>>    Sent: Sunday, October 11, 2015 9:09 AM
>>    To: Charles Engles
>>    Subject: Re: [DeTomaso] Techno question: a fine mess--update
>>    Charles, I went thhrough this with a corvette it turned out to be a
>>    loose harmonic balancer bolt. Big one that goes in the end of crank.
>>    Bill 1362
>>    https://www.facebook.com/pages/slickpaintcom/129049637149634?ref=ts&fre
>>    f=ts
>>    If you want it slick.  www.slickpaint.com  like us on facebook
>>    -----Original Message-----
>>    >From: Charles Engles <cengles at cox.net>
>>    >Sent: Oct 10, 2015 9:30 PM
>>    >To: detomaso at poca.com
>>    >Subject: Re: [DeTomaso] Techno question: a fine mess--update
>>    >
>>    >Dear Forum,
>>    >
>>    >
>>    >           It is still a fine mess.  The gremlins are well
>>    entrenched.
>>    >At this point, I have:
>>    >
>>    >1) ascertained that the balancer isn't hitting the block or pan
>>    >
>>    >2) been unable to localize precisely the noise source despite the
>>    >mechanic's stethoscope or the garden hose stethoscope (it actually
>>    >works a little better in this instance, but still not a success).  It
>>    >is coming from the front of the engine-belt area.
>>    >
>>    >3) replaced the alternator: no change and now the ammeter needle
>>    >bounces
>>    >
>>    >4) ascertained that I do have an electronic voltage regulator from
>>    >Motorcraft
>>    >
>>    >5) replaced both belts: no change other than  a slight decrease in
>>    >loudness and slightly different quality to the noise
>>    >
>>    >6) replaced the idler pulley:  no change. Sigh.   The old pulley does
>>    feel
>>    >like the bearing is starting to go out compared to the smoothness of
>>    >the replacement, but still no noise silencing with the change.
>>    >
>>    >
>>    >        I am perturbed.  I have removed the new AC belt and I will
>>    test
>>    >again tomorrow to see if I have finally localized the noise maker.  I
>>    >am thinking about trying some of the belt treatments for squeaking
>>    >since I have replaced *everything* at this point.
>>    >
>>    >
>>    >        With apologies to Mr. Friedman's famous quote: " Sadder,
>>    older,
>>    >wiser, I go now, seeking through faith and reason combined  the answer
>>    >to this baffling pageant which is the Pantera and the small by play,
>>    >which is my amateur wrenching."
>>    >
>>    >
>>    >                  Philosophically yours,  Chuck Engles
>>    >
>>    >
>>    >
>>    >
>>    >
>>    >
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