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On 7 Aug 2006 at 11:04, Roush, Norman wrote: > I was driving home Friday afternoon and heard a noise that sounded like > flapping loose sheet metal. I did not notice any change in engine > performance. I check all sheet metal and found nothing loose. With the > engine cover off the noise sounds like something rattling around in the > engine case but is not constant. It sounds like a crack or bang but not > terribly loud. Naturally there are lots of possibilities, so you really have to narrow this down before you panic. Keep in mind that most of the possibilities are fairly benign. I'd try the stethoscope concept first, just to see if you can pinpoint it, but here are some possibilities to keep in mind. Heat shield come loose on one end of a stock muffler. Damper pipe loose in a stock muffler. One loose screw, fan housing to case. Note that there are 5 fasteners here, so one loose one won't make the housing loose, but the loose screw is captured between the fan housing and the fan and will beat up the fan until one of them is destroyed. Unfortunately, the fan usually loses if this doesn't get fixed right away. This happened to Keith's engine on the way to the Invasion, and we found it impossible to pinpoint the source of the sound by any of the described means. We finally just pulled the fan and housing in desperation and out dropped the loose bolt. Loose fan to crank bolt. Loose cooling tin somewhere (check top and bottom) on the engine. Loose intake or exhaust manifold. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~