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  #31  
Old 12-22-2007, 02:08 PM
Rashakor's Avatar
Darth Diesel
 
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Location: Philly PA
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That my friend happens when you mix ATF and PSF and put them under shearing conditions and pressure. Got bad new for ya!!! you have to purge the system and fill with clean ATF.

PSF is a big Nono!!!

The emulsion with eventually cake in the tubing... Yum...
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1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi
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  #32  
Old 12-22-2007, 02:10 PM
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This kind of milkshake?

Just kidding - hope you get it sorted out!
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  #33  
Old 12-22-2007, 02:52 PM
KAdams4458's Avatar
Mmm! Diesel!
 
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Quote:
Originally Posted by Rashakor View Post
That my friend happens when you mix ATF and PSF and put them under shearing conditions and pressure. Got bad new for ya!!! you have to purge the system and fill with clean ATF.

PSF is a big Nono!!!

The emulsion with eventually cake in the tubing... Yum...
I'm not entirely certain I understand what you're saying, so just to clarify...

You're saying that power steering fluid isn't meant to be used in power steering systems?

've never seen these two hydraulic fluids do this, and I've worked on plenty of hydraulic equipment that people did this to. I've personally only seen these results from water entering the system, which is why I was puzzled when the original poster stated that water hadn't entered the system.
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  #34  
Old 12-22-2007, 03:20 PM
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Your supposed to use ATF in the power steering system.... I got read the right act by my MB Mechanic, because I put PSF in it....
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  #35  
Old 12-22-2007, 03:52 PM
KAdams4458's Avatar
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That might depend on the make and model, or more likely, the era in which the car was manufactured. Your '88 may require it, but the car in this thread is much older. My '77, for example, lists either as being acceptable, but the ATF from '77 doesn't exist anymore, and modern formulations are rumoured to cause issues. Power steering fluid, on the other hand, is still remarkable similar to what existed when the car was built, so that's what I use.

My local dealership, when queried, stated that power steering fluid was listed as the only applicable fluid for my '77 after playing phone tag with them for two days. Their current version of ATF is not listed as an acceptable alternative for the older cars, which leads me to believe that the modern ATF concerns may be based on fact.

The whole thing kind of makes me want to kidnap an MB engineer that actually knows what the truth is, and force them to tell us once and for all what is, and isn't acceptable.
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'77 300D Euro Delivery
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Current status:
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My '77 300D progress thread

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  #36  
Old 12-24-2007, 11:38 AM
Rashakor's Avatar
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ok! let's clarify something.

PSF is ok; ATF is ok. Either are ok to put in the Power steering system. Just don't put them together.

Otherwise they will form kind of a pink emulsion, that is very hard to purge and forms a very tough film on the inside walls of the entire hydraulic system. I am not sure of the chemistry of it, But they do emulsify together. Ask me how I know!

I have not had any problem with ATF alone in the 300SD. No film, no cake, no emulsion
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Aquilae non capunt muscas! (Eagles don't hunt flies!)


1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi
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  #37  
Old 12-24-2007, 01:41 PM
iwrock's Avatar
roflmonster
 
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Quote:
Originally Posted by Rashakor View Post
ok! let's clarify something.

PSF is ok; ATF is ok. Either are ok to put in the Power steering system. Just don't put them together.

Otherwise they will form kind of a pink emulsion, that is very hard to purge and forms a very tough film on the inside walls of the entire hydraulic system. I am not sure of the chemistry of it, But they do emulsify together. Ask me how I know!

I have not had any problem with ATF alone in the 300SD. No film, no cake, no emulsion

The 79?


My buddy Nik runs ATF in his 84 SD, and in the manual, its what it calls for.
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  #38  
Old 12-25-2007, 04:50 PM
Rashakor's Avatar
Darth Diesel
 
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Quote:
Originally Posted by iwrock View Post
The 79?


My buddy Nik runs ATF in his 84 SD, and in the manual, its what it calls for.
In all the manuals I have seen for these cars spanning from 1968 to 1990 ATF is the only fluid listed to put in that system.

Just after getting the 240D I put PSF in the system and got the same result in the picture above (milkshake). Since then the inside walls of the pump and the rest of the PS system are coated with an emulsion film even after purging several times the system.

The 300SD and 300TD only have had ATF all their life and no problem, no coating.

Moral of the story don't put PSF in that system!!!!
__________________
------------------------------------------
Aquilae non capunt muscas! (Eagles don't hunt flies!)


1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi
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