[s-cars] Pressure Test

Kirby Smith kirby.a.smith at verizon.net
Mon Apr 28 00:31:16 EDT 2003

I would add that not blocking the connection to the crankcase risks
blowing oil past the crankshaft seals.


Djdawson2 at aol.com wrote:
> --
> [ Picked text/plain from multipart/alternative ]
> Regarding pressure testing....  You don't "need" to block off anything.  You
> do need a sufficient, regulated supply of air.  You will be pressurizing your
> crankcase, and as a result, may hear slight pressure leak noise at the oil
> cap and/or dipstick tube.  Yes, air will pass by valves (exhaust only) that
> are partially, or fully open, allowing some air pressure to go out the
> tailpipe.  But the noise made by this is nearly inaudible under the hood.
> Open intake valves don't allow air to go anywhere, except past your rings,
> which contributed to crankcase pressurization.  I've never encountered an
> overlap situation.
> I have done this on many Audis, and it works very well.  Most recently with
> Hap, and he can certainly attest to its effectiveness.  We blocked nothing
> off, and the crank position was simply as it shut off... we didn't try and
> insure that valves were closed.  I think the biggest problem you are having
> is a lack of air volume sufficient to cover the losses that occur during this
> type of test.  My compressor has a 60 gallon tank, and we regulated it down
> to about 15 psi, so volume wasn't an issue.  Readings should appear at the
> regulated pressure on any gauge you have installed.
> HTH,
> Dave
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