vacuum shut off valve:1981 300D w123-130

3890 Views 9 Replies 4 Participants Last post by jrehm, Apr 6, 2005

benmaples

Discussion Starter · Mar 14, 2005

[?]I need to change the vacuum shut off valve that is mounted on back of injection pump between pump & oil filter housing. All Data shows to just remove the 4 retaining bolts & remove valve. it looks a little more involved than that. do I need to remove oil filter housing& how do you unhook the old valve & re-hook the new one? I would think that if you don't hook it up right the engine might race when I start it up.[xx(][xx(]NOT GOOD!
THANKS FOR ALL THE HELP

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GaryL

· #2 · Mar 15, 2005

This thread on another board, help me a out a lot... http://www.mercedesshop.com/shopforum/showthread.php3?t=101884 . Autozen's description on page 2, was especially helpful.

Good luck,
Gary

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jrehm

· #3 · Mar 15, 2005

Geezzzzzz... all that on the other thread makes you wonder if it wouldn't be better to just leave it runnging all the time. [

]

Actually, I shouldn't joke, as I have to do this soon myself. Getting tired of ruining pants from oil driping down on them from the ignition switch. So far no oil anywere else in the system though.

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benmaples

Discussion Starter · #4 · Mar 16, 2005

[8D]That oil is for lubrication of the vacuum system...YEAH....YEAH....Thats the ticket. Hey! when your done with yours you can come down to Tejas & do mine...The shut-off valve that is.[

)]Thanks for the advice.
ASTA LA LATER

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jrehm

· #5 · Mar 16, 2005

1981 300D
1964 international harvester C1200
1984 chevy cavalier
5 kids/2dogs
LIVIN' THE AMERICAN DREAM BABY

I KNOW there's a C&W tune in there somewhere.. [

]

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jrehm

· #6 · Mar 28, 2005

If you are inclined to remove the ALDA (which looks as if it is damn near necessary) to change the valve, make sure you have a couple of the plastic retaining clips on hand that hold the rod on the ALDA lever. They are easy to break (not the greatest design in my opinion), especially if they are old.

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GaryL

· #7 · Mar 28, 2005

jrehm - 3/28/2005 7:29 AM

If you are inclined to remove the ALDA (which looks as if it is damn near necessary) to change the valve, make sure you have a couple of the plastic retaining clips on hand that hold the rod on the ALDA lever. They are easy to break (not the greatest design in my opinion), especially if they are old.

I didn't have to remove the alda when i replaced the shut off valave on my '81 300td.

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jrehm

· #8 · Mar 29, 2005

Do tell!

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DOUGLAS MARTIN

· #9 · Mar 29, 2005

My 1980 300D has oil under the dash also. The vacuum shutoff valve can pump oil into the ignition switch? Those vacuum lines to the ignition could be full of oil? Another under dash project. My car shuts off fine every time. Would it do so if the shutoff valve was pumping oil?

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jrehm

· #10 · Apr 6, 2005

benmaples - 3/14/2005 5:40 PM

[?]I need to change the vacuum shut off valve that is mounted on back of injection pump between pump & oil filter housing. All Data shows to just remove the 4 retaining bolts & remove valve. it looks a little more involved than that. do I need to remove oil filter housing& how do you unhook the old valve & re-hook the new one? I would think that if you don't hook it up right the engine might race when I start it up.[xx(][xx(]NOT GOOD!
THANKS FOR ALL THE HELP

Did mine last night. It wasn't all that bad, but it does take a little patience to get the thing out and the new one in place. Took me about and hour.

As someone else mentioned, I got the new one in place (after checking it about 5 times to make sure it was hooked inside) and then used my vac tester to keep it there.

The thing that made it easier is a set of stubby ratchet end wrenches I bought. These things have been one of the most useful tool items I've ever bought.

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