Re: 2500 RPM vibration noise (was Manifold heat stove...)

["d_rex_2002" <rich@xxxx>]

Adam,

When a metal vibration noise is heard at 2500-2800 rpm, you may want
to check the heatshield on the cross-over pipe. Although this is a
difficult area to inspect if the car is not up on a lift, you can
still get to it by jacking up the back end and using jack stands.

The welds on the cross-over pipe heat shield do deteriorate more
quickly than the actual heat shields or cross-over pipes. As far as
a fix is concerned, to retain originality, this needs to be re-welded
to secure it. However, as a temporary or a semi-permanent fix, to
stop the vibration noise, use a large stainless steel hose clamp
around the heat shield and cross-over pipe, holding the heat shield
against the cross-over pipe, eliminating the vibration noise. One
side usually breaks free first, requiring only one clamp, but this 
will vary based on the number of welds that are rusted through or
broken due to vibration, over time. You will need to inspect it.

Hope this helps.

Later,
Rich W.


--- In dmcnews@xxxx, "Adam" <acprice1@xxxx> wrote:
> I was wrong about the vibration sound: its back, exactly the same as 
> before I removed the heat stove. John thinks it may be a motor 
mount, 
> I will check it out tomorrow. 
> 
> Adam 
> 
> 
> 
> --- In dmcnews@xxxx, "Adam" <acprice1@xxxx> wrote:
> > Well I tore off my manifold heat stove today. I was getting an 
> > annoying vibration sound during acceleration around 2500 rpms from 
> > the passenger side engine bay. When i checked the stove today it 
> was 
> > extremely loose and rusty. The little bolts holding it on broke 
off 
> > when i tried to remove them. Anyway, the buzz noise seems to be 
> gone.
> > 
> > Also while I was down there I noticed that the exhaust manifold is 
> > missing a nut.. dammit.
> > 
> > Adam