Valves and Compression

james accordino ssgacc at
Tue Aug 5 08:05:28 EDT 2003

Agreed on all points.  I think that'd be my next move
as well.  I think you'll get some at the dipstick even
in good cylinders, but it'll be minimal.  A
stethascope stuck in the tube in nice.  Compare the
different cylinders sounds.  I'm curious about the 0
readings.  I think someone posted about a homemade AKA
cheap leakdown tester.  Let us know what you find.
Unfortunately, I think it's not going to be good.

Jim Accordino

--- Huw Powell <audi at> wrote:
> > Have a 91 Q8 and just returned from my shade-tree
> specialist.  He
> > said the compression of the left side was 60, 100,
> 80 and 0.  He did
> > not do the right side.  According to him, a valve
> job is in order.
> > Several questions:
> >
> > 1. Is this, in fact, indicative of a needed valve
> job?
> Not yet... it is indicative of the need for more
> diagnostics.  A leak
> down test, for instance, which pressurizes each
> cylinder at TDC and
> measures how much pressure is being lost.  At that
> point, you can
> usually hear where the air is going - that is your
> leak.  If it comes
> out the tail pipe, its an exhaust valve.  Out the
> intake, its an inlet
> valve, and if it comes out the oil dipstick tube it
> would be rings,
> probably.
> --
> Huw Powell

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