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

Will Kooiman will.kooiman at gmail.com
Mon Oct 12 11:27:54 EDT 2015


Nobody said it, but a likely vacuum leak is at the intake gasket.

I pulled my intake once and saw a trail of oil getting sucked into the ports.  Ever since, I always use sealer on the intake gasket.  I used to always install them dry.  I do not use print-o-seal.

And, of course, if the leak had been on the top of the port, it would have sucked air with the likely whistling sounds.

Sent from my iPhone

> On Oct 11, 2015, at 9:55 PM, John Taphorn <jtaphorn at kingwoodcable.com> wrote:
> 
> 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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