[T3] Problem solved, but Why?

[J. Jonik]

The sound wasn't tinny or metalic at all, as if fan housing was loose.  It was like pellets of gas were being delivered to the system, though quickly...not in a smooth flow. OR that one of many electronic sparks in a series wasn't sparking....or sparking adequately.    When I adjusted points and timing, did light "scrape" (with the gapping blade) of point contacts and rotor and dist cap contacts, and jiggled all the hose and wire connections....all became well.  It hums like a top now.

I'm trying to get a better idea about How To Diagnose a Symptom...to be able to know that if there's such a "flutter" (gas or electronic), I could go right to either A, B or C...in the dark even...and do something.  One person here thought the Too Close points were the problem.  I wonder if I did a test by narrowing the point gap would reproduce that bad "fluttering" effect.  
Which reminds me to check to see if the cams on distributor post have a nice film of white grease to keep the bumper from wearing down.


Message: 12
Date: Tue, 01 Jan 2013 01:09:01 -0600
From: "Jim Adney" <jadney at vwtype3.org>
To: type3 at vwtype3.org
Subject: Re: [T3] Problem solved, but Why?
Message-ID: <50E28B8D.28158.37E96E4 at jadney.vwtype3.org>
Content-Type: text/plain; charset=ISO-8859-1

On 31 Dec 2012 at 16:57, J. Jonik wrote:

>
 How to describe the "fluttering"?? Hmmm...I thought Woody Guthrie did 
it ok in the You Tube....but,? slow it down from his fast speed to maybe
 23 1/3 rpm...deeper, rounder.?? Kinda like gas was being machine-gunned
 into the system instead of smooth flow.
> ? It didn't seem like 
it was just running on 3 cylinders....it was like it was going over 
those ridge noise bumps in the road before you get to toll booths, or on
 the sides of some highways to wake you up from drifting.?? It wasn't 
just the sound, but the vibration.

Makes me wonder if the bolts/screws that hold the fan housing to the 
case have come loose. Grab the side ports on the fan housing and 
shake them; can you move the housing independently of the case? If 
so, you need to stop and fix that right away. It's a pretty big job 
if you're not familiar with how to do it.

Hint, if you're clever, you can do this with the muffler in place.

-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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