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RE: TECH:Trying to confirm rod knock (+ Suggestion)
To me, at least, rod knock sounds like someone hitting the block with a 2-lb
ballpeen hammer.
It is a true knocking sound.
Larry sandiego16V
-----Original Message-----
From: Ben Channard [mailto:zeroid@hotmail.com]
Sent: Tuesday, October 23, 2001 6:09 AM
To: scirocco-l@scirocco.org
Subject: Re: TECH:Trying to confirm rod knock (+ Suggestion)
>From: chris gonzalez <chris24g@yahoo.com> wrote:
>the patient: 88 cabriolet 1.8 8v (all stock).
>the symptoms: start the car and everything sounds fine at idle. slight
>ticking from the hydraulic lifters, but nothing out of the ordinary.
>rev the car, and it still sounds normal. get it and drive the car up
>the block still normal for about 1/2 mile, then a dull knock knock
>knock that varies with engine speed. used a mechanics stethoscope and
>the sound is apparently coming from the vicinity of the oil pan/
>automatic transmission.
>
>I pulled off the oil pan and could not see anything out of the ordinary
>(with my untrained eye, that is). connecting rod bolts are all there,
>and torqued, at least...
>
>Should I go further and pull of the rod bearing caps and inspect the
>crankshaft? I figure if a rod is knocking it's "gonna leave a mark."
***********************************
Chris:
I can't directly address your problem but the volks.net site has .wav
files of sounds to help diagnose air-cooled VW problems. These were
apparently from a tape which was produced by John Muir of "How to Keep Your
Volkswagen Alive" fame. The home page of the site:
<http://www.volks.net/index.htm>
Then click on "Muir Engine Sounds" Then go down to Engine Noises and "Loose
Connecting Rod" Here is the direct link:
<http://www.volks.net/sounds/muir/looserod.wav>
And the accompanying description: Loose Connecting Rod (202 KB) -
Alternately rev and back off engine. Listen for the "rattlesnake song" of
the loose rod. The rod knock noise flutters in and out.
Now I have a few questions. Is this really what "rod knock" sounds like?
And is there anywhere that has similar sound files for our water-cooled
cars? If we recorded mystery sounds, could we put them up on scirocco.org
as a troubleshooting resource?
***********************************
>Has anyone used the "ground out the spark wire trick"?
So, how does this work? Please enlighten us. Thanks and HTH, benton-----
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