Valves and Compression

[Huw Powell]

> 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

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/