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  #1  
Old 09-05-2007, 11:19 AM
NovaScotia300TD's Avatar
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Converting SLS mechanical pump to electric

I know it's been done. Does anyone have any information on the procedure?

- Can anyone recommend a suitable pump for the job?
- What sort of volume does the new electric pump have to move?
- How much pressure should the pump be able to handle?
- Where is the best place to wire it into the electrical system of the car?

I'm looking at dropping a 300D motor into my 300TD, the way I seem to go through them it would be a hell of a lot easier to be able to drop the ever so plentiful 300D motors in when I need to rather than hunting forever for 300TD motors. Plus I can almost always get the 300D motor for about 1/3 that of a 300TD!

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  #2  
Old 09-05-2007, 11:29 AM
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It's been discussed on here in the past, but to my knowledge no one on the forum has done it. I remember someone claiming that it would not be possible to get the kind of horsepower electric motor necessary to produce the high pressures of the system operating on 12 volts. (or something similar to that)
I've always wondered why MB didn't use the power steering pump to power the system.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #3  
Old 09-05-2007, 01:37 PM
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Quote:
Originally Posted by kerry edwards View Post
I've always wondered why MB didn't use the power steering pump to power the system.
On my 87 300TD they use whats called the 'tandem pump'... that piggy backs on the power steering pump. 2 for 1 kinda thing. They are still separate oil circuits though.
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  #4  
Old 09-05-2007, 01:55 PM
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There is a thread somewhere where somebody had an electric pump mounted on the passenger side fenderwell up under the hood. I'll do a little searching while I have some time.....
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'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #5  
Old 09-05-2007, 01:59 PM
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Quote:
Originally Posted by Tymbrymi View Post
On my 87 300TD they use whats called the 'tandem pump'... that piggy backs on the power steering pump. 2 for 1 kinda thing. They are still separate oil circuits though.
Can that pump be retrofitted to a 123TD?? Seems better than an electric one.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #6  
Old 09-05-2007, 02:13 PM
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that would be awesome if there were a way to retrofit a 124 sls/ps pump onto a 300d motor, but some how I think it sounds too good to be true.
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  #7  
Old 09-05-2007, 02:18 PM
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I found this photo of an electrical conversion, but can't seem to get any info out of the car owner about the pump, voltage/pressure/volume/manufacture/etc... it's not that he's not willing to communicate, just that he bought the car with the pump installed and doesn't know anything about it really.
However it is a very inspiring photo!
Attached Thumbnails
Converting SLS mechanical pump to electric-picture-003.jpg  

Last edited by NovaScotia300TD; 09-05-2007 at 02:24 PM.
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  #8  
Old 09-05-2007, 02:27 PM
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Quote:
Originally Posted by NovaScotia300TD View Post
I found this photo of an electrical conversion, but can't seem to get any info out of the car owner about the pump, voltage/pressure/volume/manufacture/etc... it's not that he's not willing to communicate, just that he bought the car with the pump installed and doesn't know anything about it really.
However it is a very inspiring photo!

THAT is the pic/setup that I was talking about......
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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #9  
Old 03-27-2008, 03:39 AM
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I know this is an old post but anyone every find that pump?
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  #10  
Old 03-27-2008, 10:38 AM
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Or convert a 124 ps/sls pump to a 123?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #11  
Old 03-31-2008, 02:02 AM
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w123 ein super auto
 
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so i have the same type pump now and it KINDA works not too sure how well bu it does....can anyone else help out?
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  #12  
Old 03-31-2008, 10:01 AM
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Quote:
Originally Posted by Dieselkraut23 View Post
so i have the same type pump now and it KINDA works not too sure how well bu it does....can anyone else help out?
Help out how?? You haven't given us any information really......
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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #13  
Old 03-31-2008, 11:16 AM
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I would think most any 12v hydraulic power unit would work, provided it's small enough to mount where you need it to. Trouble is that they're usually pretty expensive. Try looking at ebay for man-lift power units, snow plow pumps or lift gate pumps. You may also check out power tilt/trim units from boats.
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Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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  #14  
Old 03-31-2008, 11:23 AM
ForcedInduction
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They would also need to be rated for the always-working SLS. Many 12V pumps only have a duty cycle of a few minutes to an hour.
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  #15  
Old 03-31-2008, 01:04 PM
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I didn't realize it runs all the time. I would think a SLS would only adjust to maintain an "average" ride height so that it's not constantly adjusting every time you go over a bump.

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Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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