[T3] A noise I've never heard

[Jim Adney]

On 26 Mar 2013 at 7:32, timothy kuehn wrote:

> I have an engine-area noise.  High-pitched, non-percussive, seems like
> more of a rub/scrape than a knock/slap.  But rhythmic and quick, so it
> sounds knockish when you first hear it. 

My first thought was loose fan housing screws, but it sounds like 
you've eliminated that. Is it a "tinny" sound, like something related 
to sheet metal? It could be a loose piece of cooling tin, or just one 
end of a stock muffler heat shield.

Listen to the generator, at the ends, for bearing noise. You can also 
get a sort of chirp/squeal from dirt built up on the generator pole 
pieces that the armature rubs against. I wouldn't expect belt squeal 
to fit your description.

Rod bearings that are going make a noise, but that's a deeper sound, 
like you said. I don't think you'll hear anything from a main bearing 
that's going, but you might check to see if there's an excessive 
amount of end play in the crank. (Watch the pulley while someone 
depresses the clutch, with the engine running.)

There's some sort of sound that comes from a loose flywheel, but I've 
never heard that one, so I don't know how to describe it.

Would it be a loose head? (Pulled head studs?)

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