carl wrote:
> >
> > > Carl
> >
> > A rapping noise on overrun as you describe sounds like rod bearings to
> > me, GF had the same noise on her Corrado and new rod bearing shells
> > made it go away
> >
> > nate
> >
>
> Thanks, Nate,
>
> If you're talking about low end bearings, it is relatively good news for
> repair. But how did it come ? Bad oil, bad load ? As I drive at low rpm, on
> low throttle, would that be enough for damage to occur in a short period of
> time ? I imagine oil pressure then doesn't get that high , ie. high enough.
>
> This car ran fine for a long time, until there was an oil problem and fuel
> system issue, then after a power test it ran worse. It is possible the
> damage dates from then. But after letting the car sit for two years, at
> first there was no noise. I'm worried timing has been altered by someone
> turning the distributor 4 degrees, any-clockwise.
>
> This distributor has a camshaft sensor, which doubles as a crankshaft sensor
> with magnetic markings. A mechanic said you could turn it as much as you'd
> like, the computer would still find the right TDP ? If not, could this have
> any influence on rod bearings wear ?
>
> Thanks again,
>
> Carl

Actually in the case I'm referring to it was just a bad batch of
bearings from the factory and a common, known problem with the G60
motors. I don't know if incorrect timing could affect bearing wear or
not; I suppose if it were advanced enough that it was always detonating
that that might happen.

nate