Fluids do not compress - air compresses. That is why there cannot be air in
break lines - the pressure must be finite and proportional to the foot
pressure applied. For the same reason there cannot be air in oil pressure
lines. Constant guage pressure depends only on the fluid pressure in the oil
line.
David Nock - You run a big Healey shop - when you replace and oil guage - do
you ensure there is a certain amount of air in the guage oil line to the guage
to dampen the needle - I dont think so ..... there is no air in my oil line -
and no oscillating needle.
Robert N. Blair Yellow 65BJ8 RNBmail@yahoo.com
--- On Wed, 9/29/10, Mark LaPierre <lapierrem@sbcglobal.net> wrote:
> From: Mark LaPierre <lapierrem@sbcglobal.net>
> Subject: Re: [Healeys] oil pressure relief valve
> To: sbyers@ec.rr.com, healeys@autox.team.net, bighealey3k@aim.com
> Date: Wednesday, September 29, 2010, 5:42 PM
> And what kind of oil pressure might
> you be running in your gem.
>
> Mark
>
> ----- Original Message ----- From: <bighealey3k@aim.com>
> To: <sbyers@ec.rr.com>;
> <healeys@autox.team.net>
> Sent: Wednesday, September 29, 2010 12:56 PM
> Subject: Re: [Healeys] oil pressure relief valve
>
>
> > I agree with Steve, the column of air in the oil
> pressure line needs to be
> > there to dampen out the oil pump pulses. I
> addressed this issue back on Aug
> > 6th in a reply to the list and David Masucci who had
> an "oscillating" oil
> > pressure gauge and he thought air in the line caused
> it. I related to him and
> > the list how my '67 BJ8 that I've owned since new and
> know that the oil line
> > had never been disconnected from the engine or oil
> pressure gauge since new
> > and I was driving in traffic and all of a sudden my
> oil pressure gauge started
> > to vibrate and the needle oscillated very rapidly and
> I noticed a drop of oil
> > on my left pant leg. I looked at the back of the
> gauge and saw a drop of oil
> > hanging on the nut that attached the direct reading
> oil line to the back of
> > the gauge. I tightened the nut and it did not
> help. I guessed there must
> > have been a column of air in the line that was lost
> due to the nut at the back
> > of the gauge not being tight enough. I took the
> line loose at the engine and
> > gauge and blew out the line and reconnected both ends
> and the problem cleared
> > up and has never reoccurred since and that was back in
> '69 or '70. There is a
> > small pin hole in the fitting to the back of the oil
> pressure gauge that
> > dampens the pressure entering the gauge and I'm
> guessing the hole can't dampen
> > the oil pump pulses with a column of oil directly at
> the back of the gauge.
> > The column of air does the dampening and smoothes out
> the pulses.
> >
> > Larry
> > '67 BJ8
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