Re: TECH:Trying to confirm rod knock (+ Suggestion)

["Curt Voss" <curtv@eudoramail.com>]

On Tue, 23 Oct 2001 13:08:31   Ben Channard wrote:
>
><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?  

That's exactly what both my Rabbit and my old Mercury 428 sounded like when the bearing was just starting to go bad - kind of a rapid hollow knock or rattle at medium load or partial-throttle deceleration, usually only in a narrow rpm range - don't remember just where but probably around 4000 in my VW. As the bearing disintegrates it becomes louder and more "solid" sounding.

>
>>Has anyone used the "ground out the spark wire trick"?
>
>So, how does this work?  Please enlighten us.  Thanks and HTH, benton-----

Pop your hood and rev the engine to make sure you can hear the knock, then pull off the spark wires one at a time and rev the engine again. When you pull the wire from the bad cylinder the knock will quiet down or go away altogether because there's no load on the piston. If you're really careful about things you can ground the plug wire, I usually don't bother. This works for main bearings too, except if it's one of the middle three bearings then it will quiet down when you pull the two wires that straddle it.


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