Whats differeent on a Taurus power steering pump? - TCCoA Forums
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post #1 of 5 (permalink) Old 09-04-2005, 10:19 PM Thread Starter
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Whats differeent on a Taurus power steering pump?

About a year ago I replaced a leaky pump with a clean salvage unit. It was noisy but worked so I ran it. Today I replaced it again with another taurus pump and its even noisier. The fluid in this pump was perfectly clear and the outside was clean.

What is different in the pump?
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post #2 of 5 (permalink) Old 09-04-2005, 10:32 PM
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what are you using for fluid? All of the synthetic and blends I have used cause my pumps to
whine. The non-synthetic are all I use at this point just because of that.
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post #3 of 5 (permalink) Old 09-04-2005, 10:39 PM Thread Starter
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On the last pump I ran trans fluid but when it whined I switched it to standard power steering fluid with no improvement.

I was cross referencing the pump and my tbirds pump is the same unit used in the F-150 250 and 350. Externally the pump is identical but maybe internally the Taurus pump just can't hang.
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post #4 of 5 (permalink) Old 09-05-2005, 06:04 PM
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Correct me if I'm wrong. There are only 2 models of hydraulic steering pumps manufactured by Ford, the C-II and the C-III. Both are still in production, and these are the only 2 PS pumps I've ever seen used on Ford products.

The C-II pump is what's used on all 3.8L engines, as well as some other vehicles, including some F-series trucks. It's identifiable by it's integral fiberglass fluid reservoir, mounted directly onto the back of the pump. The reservoir is usually yellowish-brown, sometimes black, and has the 1/4 turn, dipstick cap on it. This is the unit you see on the the V6 MN12's, and the Taurus, as well as other vehicles. The C-II pumps have a habit of becoming noisy, and making the whining sound, regardless of how well they're maintained or what mechanical shape they're in. Once they get a few thousand miles on them, they whine.

The C-III pump is the better of the two, IMO. It's smaller than the C-II, and it's readily identified by the absence of any fluid reservoir on the pump itself. Rather, it has a port on the body that allows connection of a remote reservoir, making it useful it cramped spaces, like on the 4.6L V8 MN12's, some F-Series trucks, Focus, and other vehicles where space is limited. I've never heard of this model pump making any "bad" noises, unless it was broken or low on fluid.

EDIT: on the C-II unit, possibly on the C-III, there is an internal valve (forget the correct name of it) that is calibrated to the specific vehicle the pump is used in. I believe it is used to adjust steering effort. This is not to be confused with the external VAPS or EVO actuators found on some units.

Hope this helps!

Last edited by hotbird; 09-05-2005 at 06:09 PM.
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post #5 of 5 (permalink) Old 09-06-2005, 01:16 AM Thread Starter
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Yeah, as far as I knew all the cII's were the same. I'm going to install a thunderbird flow control valve to see it it helps.
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