filtering PS fluid(looking for info on a thread a few years back)

[William Ng]

Just the topic I was pondering myself. With all the threads about hydraulic 
failures...I'm surprised this idea hasn't been investigated already.

I also have run into the idea of using a standard metal canned fuel filter 
on the return line to the PS reservoir. I saw this on an episode of 
Motorweek, or was it Last Chance Garage?  My first thought was that little 
thing can withstand the pressure???

Apparently, there isn't much pressure on the return side. I'd estimate 
10-15 psi.
The paper media may survive. But I can't be sure of the Audi's return pressure.

I looked into some other in-line fuel filters. Two aftermarket ones looked 
feasible, each with its pros/cons.

Both are re-usable. One consists of an aluminum tube with screwed on ends. 
The element is a bronze mesh. You can rinse off the element and re-install 
it. But it doesn't have level of filtration achieved by paper or the 2nd 
aftermarket filter.

The 2nd unit uses a nylon cartridge which is disposable once clogged. The 
cartridge is seated in the middle of a tempered glass cylinder, capped by 
steel ends which screw down and compress on the glass cylinder for a seal.
The idea of using glass was so the owner can inspect the element easily. 
But the downside is the limited pressure it can withstand. but its 
filtration is superior to the bronze and paper elements.
* I guess one can machine a matching stainless steel cylinder to replace 
the glass.

If pressure is a concern and fuel filters aren't appealing to 
you....there's always the use of a very small motorcycle spin on oil 
filter.  They are cheap, high flow, high pressure, and aren't too large to 
waste precious Pentosin. The threading on most of these filters are 
identical to those on japanese cars.
If one can locate a source for remote mounts meant to use an existing 
japanese filter, and not the humongous Ford PH-8(?), we may have an ideal 
solution.
A couple of NPT barb or NPT to AN fittings and we're set.

Just my $0.02.

Will







At 02:25 PM 5/12/01 -0400, you wrote:
>Dan and I were talking about filtering PS fluid because someone on the 
>200q20v list asked about flushing their system.

snipped...
--
Regards,
Will
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William Ng...........willng at netzero.net...........Boston, MA USA
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"Never knock on death's door, ring the doorbell and run away..."
"he just hates that."
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