Date: Sun, 3 Apr 2011 07:09:05 -0700
Reply-To: Rocket J Squirrel <camping.elliott@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Rocket J Squirrel <camping.elliott@GMAIL.COM>
Subject: Re: More fun with mechanics
In-Reply-To: <BANLkTind+tyuVXtJ6gb+qMa_Yub-TPbARQ@mail.gmail.com>
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Thanks, everyone, for suggestions for what to look for. I'll compile
them and take them with me next time I see the mechanic. There might be
something there that he didn't think to look at.
--
Rocky J Squirrel
On Sun, 2011-04-03 at 09:54 -0400, Jim Johnston wrote:
> Not sure if it was mentioned yet, I suggest checking each rear shock
> by grabbing and trying to twist it. You may hear a what your looking
> for...
>
>
>
> I had a rear shock with loose top bolt make the sort of sound you
> describe...
>
>
>
> Jim
> Wilmington, NC
>
>
>
> On Sat, Apr 2, 2011 at 3:50 PM, Rocket J Squirrel
> <camping.elliott@gmail.com> wrote:
>
> The thunking only occurs when the drivetrain gets slack. Like
> taking
> your foot off the gas pedal while cruising slowly on a flat
> street.
> Re-applying pressure on the pedal does not cause the noises.
> Sometimes
> when the van is moving at just the right speed . . . 8 mph or
> so . . .
> on a flat street, sort of idling along, you can hear the
> mystery thunker
> going thunk thunk thunk. It's a heavy sound, can be felt a
> little bit.
>
> Second gear seems to be perfect to set up the right
> relationship between
> engine power and van moving resistance, allows the right
> amount of
> slack. If that makes any sense at all, first is too "tight"
> and 3rd,
> well, there's a lot more road noise when up in third it might
> be
> happening but can't hear it.
>
> If this sounds like a suspension bushing thing, then we'll
> look again
> there. But it feels like a drivetrain thing. But the engine
> does not
> move visibly when thunking, the transmission and diff were
> rebuilt and
> the noise was happening before and now after the rebuild, and
> Gary just
> checked the axles.
>
> It baffles science.
> --
> Rocky J Squirrel
>
>
>
>
> On Sat, 2011-04-02 at 09:34 -0700, Don Hanson wrote:
>
> >
> >
> >
> > On Sat, Apr 2, 2011 at 9:10 AM, Rocket J Squirrel
> > <camping.elliott@gmail.com> wrote:
> >
> > I took Mellow Yellow to see a new doctor . . . I
> mean mechanic
> > yesterday. There has been this mysterious "thunk"
> sound
> > whenever I'm
> > cruising at low speeds on flat surface streets and
> take my
> > foot off the
> > accelerator.
> >
> >
>
>
> > Suspension bushing(s) maybe?
>
>
>
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