On Wed, 1 Jan 2003, Andrew Nock wrote:

> As with many, a clear drone noise starts at 3,300 rpm and continues upward.
> The noise only occurs under load - ie when I run at 3,300 rpm standing
> still, drone is not heard. As for tone, most of my auto aware friends
> hearing the sound think it is either exhaust or air intake related.

I'm having a similar problem with my '82 diesel.  At 55 mph there's a loud
resonant drone.  It disappears below 50 or above 60.  At first I thought
it was my exhaust, which resembled a lace doily more than solid metal.
But now I've got the whole thing replaced with the stock system, and I
still have the same noise.  (It's quieter at all other speeds, though.)  I
do still have a small leak at the muffler joint I need to fix with some
sealer, but it doesn't seem like enough to cause this much noise.

Is this one of the cabinets sounding off?  Do I just need to stuff a
sleeping bag in the right one?  Or is it because I'm missing the air
intake snorkel?  I assume there's supposed to be one, all I've got is an
opening on the air cleaner cover that looks like something should be
attached to it.

             _ _
  __ _ _   _| | |  | David M. Brodbeck (N8SRE)              Ypsilanti, MI
 / _` | | | | | |  +-----------------------------------------------------
| (_| | |_| | | | @ cyberspace.org
 \__, |\__,_|_|_| "To the optimist, the glass is half full.  To the
 |___/             pessimist, the glass is half empty.  To the engineer,
                   the glass is twice as big as it needs to be."