Fluids for 82 Silver Spirit - Rolls-Royce and Bentley Forums
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post #1 of 20 (permalink) Old 05-09-2017, 12:33 PM Thread Starter
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Fluids for 82 Silver Spirit

Is it ok to use Dexron 3/Mercon to my power steering pump. The notice I found states I need Desron 2 but i cant find that anywhere.


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Curtis
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post #2 of 20 (permalink) Old 05-09-2017, 01:51 PM
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Yes Curtis, Dexron III is fine in the power steeering and automatic transmission.
I would even suggest III rather than II

Jean

Continental R . 1997
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post #3 of 20 (permalink) Old 05-09-2017, 02:02 PM Thread Starter
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post #4 of 20 (permalink) Old 05-10-2017, 07:03 PM
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Dex II was the standard power steering fluid THEN. 1982. It was more of an accident that ATF found its way into power steering.
Transmission fluids contain friction enhancers to keep the clutches happy, and that is the last thing we should put in our (fragile) steering racks. Topic well covered here on the forum.
Any mineral hydraulic fluid will do a better job than ATF i.m.h.o.
I use LHM. In Europe, LHM is available cheap in large canisters (25l).
Some of my friends use Mercedes-Benz power steering fluid, one uses Volvo.
For the gearbox, I use Dex VI (fully synthetic), as recommended by GM.
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post #5 of 20 (permalink) Old 05-11-2017, 08:28 AM
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Hi JP, I strongly disagree.

Never heard about LHM in power sterring for our SZ cars.

Original recommandation was Dex II , then Dex III.

My Sy cars were using dex II the Dex II.
My SZ cars, 92 and 97 were using Dex II then the recommandation from Crewe was Dex III.

Dex III is totally compatible where Dex II was recommanded. But the contrary is not valid, don't put Dex II where Dex III is required.

I would like others opinions such as JeyJey, Paul Yorke & Brian, to make sure we provide a relaible reply.

Still owning Mercedes and having owned several from several generations and reading owners books in details I can tell you that untill 95, MB recommandation was Dex II then Dex II for power steering.

Then fluid changed and Mercedes added 2 new power steering fluid, whic are not compatible with anythinelse. One fluid is sort of yellow, the other is sort of green ( pentosin).
Even is Mercedes you cannot put LHM.
LHM is specific and requires specific seals.

Jean

Continental R . 1997

Last edited by Jean7; 05-11-2017 at 08:33 AM.
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post #6 of 20 (permalink) Old 05-11-2017, 03:40 PM Thread Starter
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After putting the fluid in the resevior tank there seems to be a very loud noise when I turn my steering wheel. also when I opened the resevoir I know see air bubbles. My next question is how do you bleed the power steering system to rid the air bubbles.


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post #7 of 20 (permalink) Old 05-11-2017, 04:14 PM
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With the car running and level, fill the reservoir and slowly turn the steering wheel from lock to lock, keeping the power steering topped up. Do not turn the wheel to lock and hold it there as these racks are not the strongest. Do this two or three times and you should be good to go.
Mark
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post #8 of 20 (permalink) Old 05-11-2017, 05:34 PM
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otherwise, if still not work, stop the engine overnight to stop power steeering fluid emulsion.
In the morning lift the front of the car, then turn wheels left and right sevral time with engine off and check fluid level.
This will bleed the system.

Jean

Continental R . 1997
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post #9 of 20 (permalink) Old 05-12-2017, 07:08 AM
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Quote:
Originally Posted by Jean7 View Post
Hi JP, I strongly disagree.

Never heard about LHM in power sterring for our SZ cars.



Jean
Jean,
We agree to disagree

There are better fluids than transmission for the steering, as transmission fluids have friction enhancers. LHM is a very good and stable lubricant, and the fact that we use it in our 3000psi braking/suspension system speaks for this fluid! The steering is only another hydraulic system, and my position s that LHM is the preferred fluid over Dexron.

Transmission fluids are optimised for gearchanges and not lubrication, and they are in fact poor lubricants. That they are used in power steering systems is largely an accident. As you mentioned yourselves, most manufacturers moved away from Dex to hydraulic fluids more adapted to the requirements of a steering box/rack.
I also use LHM in the hydraulic system of the convertible hood on the Corniche.
As long as the fluid is mineral, there won't be any issues with seals.
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post #10 of 20 (permalink) Old 05-12-2017, 12:29 PM
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Thanks JP, specially for considering my opposition nicely, and explaining.

Very interesting to read your remarks.

Jean

Continental R . 1997
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