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#1
06-07-2005, 02:59 PM
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bad vacuum cutoff in iginition switch
Do you have to pull the whole ignition switch assembly to replace a bad /leaking /oil soaked vacuum valve in the ignition switch. Any detailed guidelines for doing that. Did a search and didnt find much detail. Just the usual references to the switch getting oil in it from a bad cuf off value on the IP Thanks Russ
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1978 300 D 258,000 + miles sold 1995 1983 300 D Turbo 152,000 miles Thank God for the man who put the white lines on the highway 
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#2
06-07-2005, 03:13 PM
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You can do it by removing the instrument cluster and R+R the valve. I have done it this way.
Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#3
06-07-2005, 03:45 PM
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You sure its the switch on the ignition and not the one on the IP?
It is possible to get it off with the switch still in the car, you'll need to pull the cluster and get a shorty screwdriver. Hopefully you can break the screw free.
__________________
'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter. '84 300D Turbo 240k (Anthracite Grey) - Garage Queen '83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.
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#4
06-07-2005, 05:19 PM
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Thanks for the guidance. Yep it's the vacuum cutoff on the switch. Just replaced the leaking cutoff valve on the IP. checked it with my mity Vac tool and if I plug the brown line to the switch It holds vacuum on the system. If I plug the line from the switch to the IP cutoff valve no vacuum. Its the valve in the switch. It is also full of oil from the old leaking cutoff on the IP.
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1978 300 D 258,000 + miles sold 1995 1983 300 D Turbo 152,000 miles Thank God for the man who put the white lines on the highway
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#5
06-07-2005, 07:12 PM
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I replaced mine without pulling the instruments. Get a 90 degree screwdriver and be ready to stand on your head. I love oil in vacuum lines it makes the vacuum run easy.
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2009 CLS550 55,000 2004 ML350 144,000 2004 X5 95,000 2002 X5 165,000 1996 320S 155,000 (sold) 1991 190E 192,000 (sold) 1989 300SE 160,00 (sold) 1984 300D 210,000 owned since 85, (sold) 1984 300SD 160,000 (sold)
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#6
06-07-2005, 07:33 PM
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Quote:
 Dave
__________________
1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#7
06-08-2005, 08:42 AM
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You might want to pull the assembly anyway. If your vacuum switch has failed you've likely got oil all inside the assembly.
especially if you discovered the problem due to oil dripping.
__________________
'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter. '84 300D Turbo 240k (Anthracite Grey) - Garage Queen '83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.
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