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  #1  
Old 06-19-2004, 03:38 PM
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Join Date: Jun 2001
Location: Denver, Colorado
Posts: 127
question about vac shut off 300D

was gonna replace this in my car because its not properly shutting down with quick response...it take a good 30secs to a minute for it to shut off...

theres oil in that vacumm line that goes into
there are two types of vacuum solenoids that are offer on the net:

1. genuine bosch one part #: 1 427 133 091 labeled as injector pump stop solenoid shut off

2. other brand called MTC same as label above

the bosch one is 54.95 and the other MTC is 17.59...

your recommendations: should i save a couple of bucks and go generic or get the bosch one...i have never done this replacement before but i am aware of the precautions of engine run off..i've read the posts several times on this


thanks for all inputs

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  #2  
Old 06-19-2004, 04:21 PM
Larry Delor's Avatar
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Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,114
Can't help you on part selection.
But... I do want to ask if you have made sure that it is the shut off, and not a bad/cracked vacuum line, or your vacuum pump loosing its ooomph. Are your doors locking quickly, or are they taking their time. If you lock your doors (with you in the car-heh) and then try to shut if off, does the shut off time change? If so, you might have a (cheaper) leak somewhere else.

Just my two cents...

-Larry
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  #3  
Old 06-19-2004, 05:09 PM
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Join Date: Jun 2001
Location: Denver, Colorado
Posts: 127
no i had already applied vacumm to the main solenoid at the IP pump using a mity vac. it will not shut right at the moment i apply full vacuum with the mity vac. the time does improve a little but its still wont shut off for a good 20 seconds or so
also there is a little bit of fresh oil present at the lip of vacuum line...this tells me that shut off solenoid is bad for sure.
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  #4  
Old 07-15-2004, 04:48 AM
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Join Date: Jul 2004
Location: Sydney, Australia
Posts: 197
You'll need to replace the vaccum shut off valve. The diaphram is probably leaking which is allowing engine oil from the injector pump the enter the vaccum system.

You need to replace the valve to help shut down the engine and to stop further contamination of the vaccum system.

Remove the panel under the drivers side of the dash board and look at the vaccum element on the ignition switch, it'll probably be covered in oil.

Check that the vaccum pump isn't leaking oil (you should have a clear vaccum hose on it anyway).

Install a filter (A 000 078 06 56) between the main vaccum line off the vaccum pump and the first fitting leading to the the interior vaccum. This will help prevent oil from making it's way into the brake booster and damaging it due to oil perishing the diaphram.

Unfortunatly there's already oil in your vaccum system.......you may have future problems.
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  #5  
Old 07-15-2004, 10:38 AM
JamesStein's Avatar
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Join Date: Apr 2004
Location: Tallahassee, FL
Posts: 586
I agree with AusMBTech.

If there is oil in that vacuum line going to the ingnition. The switch on the IP is failing and needs to be replaced.

If you take brake cleaner or electectrical contact cleaner and spray it through the vacuum line you can clean the oil out.

It may actually just be the oil in the line that is interfering with the vacuum. I'd go ahead and clean out both the brown vacuum lines going to the ignition. You'll probably want to go ahead and replace the rubber connectors on the ignition assembly. Perhaps even clean out the vavle on the ignition and the cam as well.

My wifes car had quite a bit of oil in it and it was actually dripping out onto the floorboards.
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question about vac shut off 300D-oil_on_ignition.jpg  
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'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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  #6  
Old 07-15-2004, 10:51 AM
LarryBible
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WARNING!!!!!!!!!!!!

Upon replacing the shutoff diaphragm ENSURE that the hook is caught on the governor. If it is not the engine will run away at top RPM and can be destroyed.

To check this, install the diaphragm and actuate it with your vacuum source. If the STOP lever does not move, the hook is not engaged and if the engine is started will go to max RPM and you won't be able to shut it off unless you are prepared to do so with the proper tool in hand.

Even if the stop lever moves in the test, have a 17MM open end in your hand when you start the engine. If it runs away, start cracking open each injector line until the engine dies.

The alternative to this shutdown method is to have the air cleaner off and have something handy to block the intake at the open manifold. Covering the air cleaner will not stop the engine. There is too much air leakage at that flow rate. Been there, done that and destroyed engine. Don't you be next.

BE CAREFUL!
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  #7  
Old 07-16-2004, 09:14 AM
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Join Date: Jul 2004
Location: Sydney, Australia
Posts: 197
I replaced a shut off valve only a few weeks ago on a w123 300D. it had a inspection plate on the top of the inline pump which allowed me to watch the hook on the vaccum shutoff valve to catch on the lever inside the pump. If you have this plate on your pump then I suggest that you take it off so you can see what you're doing instead of feeling it.

I was changing the valve and installing the filter after the second brake booster had failed on this vehicle even though it was quoted as the casue of failure of the first booster (owner didn't want to pay any more money , pity about the bill for the second booster )

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