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  #1  
Old 02-22-2005, 09:49 PM
WANT '71 280SEL's Avatar
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Location: Dallas, TX
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300SDL key switch access

I have narrowed my no start problem to the vacuum portion of the key switch. How do I remove the switch? I've read how to remove the cylinder, but what about the rest? I have the under panel off now since I just resoldered the CC amp and haven't put it all back together yet.

As usual, your help is most kindly appreciated.

Thanks
David
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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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  #2  
Old 02-23-2005, 04:14 PM
WANT '71 280SEL's Avatar
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Location: Dallas, TX
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Bueler, Bueler...

Thanks
David
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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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  #3  
Old 02-23-2005, 07:54 PM
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well, when you can access it, the key will have to be in position 2 to remove the electrical plug at the rear of the ignition. once thats out, with the key in the same position, push in the pin to the left of the tumbler on the shaft and pull the steering lock piece out of the column. I think theres a small bolt somewhere among all this that had to be removed too, should be easily visible if I recall.
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #4  
Old 02-23-2005, 11:43 PM
WANT '71 280SEL's Avatar
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Location: Dallas, TX
Posts: 3,378
What part should I order to replace the vacuum element of the switch? I think there are around 4 different pieces listed on fastlane regarding the key switch.

Thanks
David
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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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  #5  
Old 02-23-2005, 11:47 PM
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So it is definitly bad then? it supplies vacuum no matter what position of the key?
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #6  
Old 02-24-2005, 12:04 AM
WANT '71 280SEL's Avatar
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Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
When the key is turned off, it apples vacuum as it should. The problem is, once the key is turned on, it doesn't always turn off the vacuum. I looked under diesel injection I think and found the shut-off valve that's attached to the key switch. So, I need to order this shut-off valve and the electrical portion and my key switch should be good to go. A member here sent me the PDF from the 126 manual which should help greatly, I just hope I can make sense of things once I'm in there. Does anyone know if it's possible to replace the electrical portion and the shut-off valve while the whole lock assembly is in the car? That lock thing is huge and I can tell it would be a pain if I have to remove the steering wheel and all other surrounding pieces.

Thanks
David
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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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  #7  
Old 02-24-2005, 07:16 AM
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Quote:
Originally Posted by WANT '71 280SEL
Does anyone know if it's possible to replace the electrical portion and the shut-off valve while the whole lock assembly is in the car? That lock thing is huge and I can tell it would be a pain if I have to remove the steering wheel and all other surrounding pieces.

Thanks
David
That, I dont know if its possible or not. Just before you start pulling it out to replace, or ordering parts, you can definitly feel vacuum on the line to the injection pump with the key on, correct?

The vacuum switch is a small, maybe an inch long or so, metal piece held in by two small screws, with the two vacuum lines attached to it. There is also, for the lack of the correct term, a "plastic disc" under the electrical part of the ignition (mine was blue) that turns with the key to press in the tab on the vacuum switch. Its possible that piece is broken, only way to tell is to take it all apart, you can't see it with everything still assembled.
__________________


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #8  
Old 02-24-2005, 04:05 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
 
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
John, I definitely feel vacuum at the hose with the engine off. I ordered the key switch vacuum shut-off valve and electrical part.

Thanks
David
__________________
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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

_____________________________________________
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  #9  
Old 02-24-2005, 05:42 PM
Johnhef's Avatar
Senior Member
 
Join Date: Feb 2005
Location: Frederick, Md
Posts: 4,540
well david, when you get it out, let me know what you find, good luck.

one more thing, great username! i miss my 69 280SE I'll get another someday...
__________________


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Last edited by Johnhef; 02-24-2005 at 05:48 PM.
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