Sounds like a funky CV joint to me. Even fully lubed, there can be a damaged ball that hangs a bit.
Karl Wolz
_____ From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Rocket J Squirrel Sent: Saturday, April 02, 2011 12:50 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: More fun with mechanics
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? _____ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1209 / Virus Database: 1500/3546 - Release Date: 04/02/11 |
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