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  #1  
Old 12-07-2002, 07:04 PM
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Join Date: Jun 2001
Location: Madison, NJ
Posts: 117
3 in vacuum at door system check valve - too low?

1982 300 TD takes a long time to shut off. When I plug vacuum line before the door system check valve the car shuts right off. Opened up driver's door and I put mighty vac on drivers door outgoing yellow & red line and system locked. then on outgoing yellow and green and system opened. Hmmm. Then tied mighty vac to master valve in line and system working fine. Then I tested line just before check valve in the engine compartment and pulled a vacuum - - took a while to pump up the resevoir tank but it held a vacuum. So where is the problem? I checked what the vacuum system is pulling just before the check valve and it is pulling about 3 in.Hg. Is that too low?
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  #2  
Old 12-08-2002, 05:08 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
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Yes. Spec is 11 or more. Check for leaks in the main vac line, and if nothing else is leaking, suspect the vac pump, they do die. The plastic fitting in the center of the main line can crack, giving you low vac. You must order the entire line, you cannot get just the fitting.

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #3  
Old 12-08-2002, 07:07 PM
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Join Date: Jun 2001
Location: Madison, NJ
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main vac

I tested the vacuum pump itself at the most forward point and shows around 15 inches. Is that correct?
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  #4  
Old 12-09-2002, 09:22 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
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Yes. Check for obstructions is the plastic nipple on the main vac line, they tend to get plugged.

If it is clear, you probably have a leak in the line -- check all the rubber connectors, they get hard and leak.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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