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  #1  
Old 10-23-2003, 03:18 PM
EricSilver's Avatar
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Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,213
Central Locking Vacuum Pump: Repairable?

1989 260E

My vacuum door locks have stopped working because the vaccum pump under the back seat does not appear to be producing suction.

When I turn the key in the lock, and put my ear very close to the pump, I can hear it hum -- although MUCH more faintly than its normal, louder hum, which I could hear from anywhere in the car.

Sounds like whatever motor is in there is failing. Are these pumps fixable, or do I need to replace it?
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2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

------------------------------------
Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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  #2  
Old 10-28-2003, 11:58 AM
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Join Date: Feb 2002
Location: Belgium,Europ
Posts: 196
Dear Eric Silver,

There is a site with a realy good explanation and pic's on the following web site. Good luck!

Danny

OJs W124 Tech Tips : Central Locking System

http://ow.no/mb/w124/tech/electrical/centrallockingsystem.html
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  #3  
Old 10-28-2003, 05:27 PM
EricSilver's Avatar
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Join Date: Mar 2000
Location: Fairfax, VA
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Danny,

Thanks for the info; it's very good.

I know, however, that the pump itself is at fault. I am wondering if it can be easily repaired, or does it need to just be replaced. (I hate to buy something new if a simple and cheap fix is available.)
__________________
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

------------------------------------
Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
Reply With Quote
  #4  
Old 10-28-2003, 09:12 PM
arif's Avatar
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Join Date: Apr 2002
Location: Los Angeles
Posts: 138
Pump is not reparable.....l bought one on Ebay for $60, has been working well for the past yr or so, dealer wanted $800 for new.
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1993 500SEL
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  #5  
Old 11-06-2003, 01:38 PM
EricSilver's Avatar
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Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,213
Arif,

I did just that -- bought one on Ebay for $30, and got it today. Will install tonight. Hope it works -- and thanks for the scoop.
__________________
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

------------------------------------
Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
Reply With Quote
  #6  
Old 11-07-2003, 04:30 PM
EricSilver's Avatar
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Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,213
Well,

The pump is in and works fine.

I suspect the old one burned out because I have a leak, it seems in the fuel filler door vacuum element, causing it to run, on unlock/pressurization, for too long. (Over a few years, those extra thirty seconds per unlock event probably add up.)

I have no idea how to remove the element, and would probably be content with bypassing it.
__________________
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

------------------------------------
Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
Reply With Quote
  #7  
Old 11-07-2003, 05:01 PM
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Join Date: Jan 2003
Location: Florida
Posts: 1,084
Gas Tank flap

I think the diaphram is available, probably not a major repair. The entire assembly for a 560SL is less than $25, and the diaphrams for up to 84 were $7,or plug it untill you decide (Golf Tee)
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  #8  
Old 11-07-2003, 10:05 PM
EricSilver's Avatar
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Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,213
I Peter,

Thanks for the scoop. I will definitely do both of those -- plug the vacuum line for a a few days, and then install the replacement diaphragm after ordering it.
__________________
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

------------------------------------
Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
Reply With Quote
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