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  #1  
Old 03-25-2019, 07:09 AM
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Join Date: Mar 2010
Location: Freehold, NJ
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switching a w116 to w126 lock system?

Since I have a good 1988 560SEL parts car that I have been selling items out of and also putting some in my 1979 300SD, I was wondering if anyone has ever hooked up newer vacuum pump to the lock system in an older car like mine that doesn't have one? I have a good working electric vacuum pump and it looks like it would be simple to just hook up the door to and fro lines to the pump and wire it up. I'm just wondering if there would be something more to it or would it be just that simple??

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1979 Mercedes 300SD 314k
2003 Mercedes E500
2002 Toyota 4Runner
1950 Packard 8
1985 Ford F-250 diesel
2010 Chrysler Sebring Convertible

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
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  #2  
Old 03-25-2019, 11:02 AM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 5,783
You also need at least 1 of the lock mechanisms and associated wiring if you do convert. The motor is triggered by the vacuum lock mechanism in the door that's unlocked with the key. The W126 has mechanisms in both front doors and the trunk.
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'11 Honda Accord EX - "The Daily" 73K
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'91 350SD - "Jest-D" 176K (Sold 12/20/20)
'94 BMW 525i - "The Red Car" 181k
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  #3  
Old 03-25-2019, 11:05 PM
sixto's Avatar
smoke gets in your eyes
 
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Location: SF Bay Area
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IIRC W116 pods have a chamber to lock with vacuum and a chamber to unlock with vacuum. W126 pods have a single chamber that locks with vacuum and unlocks with pressure.

I’m still thinking how to wire the pump to run in vacuum mode when you lock and unlock. It might be easier to fit two pumps.

Sixto
98 E320s sedan and wagon
02 C320 wagon
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  #4  
Old 03-26-2019, 12:33 AM
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Join Date: Mar 2010
Location: Freehold, NJ
Posts: 492
That's true. My 300SD has two hoses to each lock to lock and unlock. The 560SEL has a single hose. I'll just keep my current system since it does work. I figured if it was an easy swap why not, but not looking to do a conversion for no reason.

__________________
1979 Mercedes 300SD 314k
2003 Mercedes E500
2002 Toyota 4Runner
1950 Packard 8
1985 Ford F-250 diesel
2010 Chrysler Sebring Convertible

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
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