| power steering filters are not necessary [message #221808] |
Mon, 09 September 2013 16:45  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Here's an interesting piece of ancedotal commentary from an ex GM employee and steering guru, Jim Shea.
Sounds like the steering system won't fail due to dirt, but I'd think a filter would improve the systems lifespan.
http://jimshea.corvettefaq.com/wp-content/uploads/2011/02/Are-Strg-Fluid-Filters-Necessary.pdf
ARE STEERING SYSTEM FLUID FILTERS REALLY NECESSARY?
You may find this actual true story to be quite interesting: General Motors in the early
1970's found a number of lawsuits being initiated against GM vehicles with the Saginaw
steering systems. Of course back then, Saginaw steering components were used on 100%
of GM vehicles. Even before the internet, lawyers had a good system of communicating
with each other.
The allegation would go like this: At 2:30 in the morning, after the plaintiff left the bar
(only having had one beer), the steering "locked-up" and the car went off the road and
crashed. In many cases, by the time the lawsuit was filed the wrecked car was no longer
available for inspection. But the allegations were that very fine particles (or maybe a big
metal particle) would jam the very close tolerance gear valve; locking up the steering;
resulting in the accident.
We had an expert engineer witness at Saginaw that was at the disposal of General Motors
lawyers to assist them with technical issues. He was called to consult on these types of
cases that involved Saginaw parts. What he decided was the following: Saginaw would
go out and purchase a test car nearly identical to the one in the lawsuit. Saginaw would
then install a brand new OEM steering system; pump,gear, hoses, reservoir, and fluid in
that car.
He then made a film (I don't believe there was any video tape back then) showing that car
with an open hood. A Saginaw person would go out to the factory floor and actually
sweep the floor of chips and debris, placing them in a paper cup. He would then take the
cup to the test car; remove the reservoir cap; and dump the cup full of dirt, chips, etc into
the pump reservoir. Our expert witness would then drive that car to the location of the
civil trial. He would then show the movie and he was always able to report the he found
no problems whatsoever in driving the car from Saginaw, Michigan to the court (which
could have been hundred or even thousands of miles away).
Amazing, after General Motors and Saginaw won a couple of "lock-up" cases with
testimony and proof such as the above, the lawsuits stopped.
Based on the above and inspecting many, many, test steering systems that were driven
over 100,000 miles in police cars, taxis, medium duty trucks, etc, I never felt that any
type of filter was necessary. The magnet works just fine with no additional restriction to
the fluid flow in the system.
Jim
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: power steering filters are not necessary [message #221839 is a reply to message #221808] |
Mon, 09 September 2013 19:02  |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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I wonder why GM put the screen filter in the hydraulic
windshield wiper motor? Mine works better without it.
Regards,
Bill
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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