[DeTomaso] Techno question: a fine mess--update II
John Taphorn
jtaphorn at kingwoodcable.com
Sun Oct 11 21:55:34 EDT 2015
Sloppy writing by me. I agree with Will's suggestion that......
JT
On 10/11/2015 8:53 PM, John Taphorn wrote:
> 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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>>
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