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  #1  
Old 04-13-2008, 08:45 PM
Actros617's Avatar
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How to R&R a 300SDL shut valve...

My 1987 300SDL wont shut off because the shut off (i guess)is set too high (because i accdentily bumped it a rachet while removing my injector!!!). My question is how do you remove and replace that shut off valve, or even adjust it would be great, and can some one post a diagram of the shut off valve

THX

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  #2  
Old 04-13-2008, 08:52 PM
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I'm not familiar with that engine, but I believe the odds are that you dislodged, broke or disconnected a vacuum line.
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  #3  
Old 04-13-2008, 10:59 PM
Actros617's Avatar
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i have checked all vacumme line and it seems fine to me, it shut off b4, see i while i was replacing the fuel injector my rachet bumped up that stop switch, it used to be down but now its way up...
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  #4  
Old 04-14-2008, 12:42 AM
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gsxr shared a method of removing the ALDA without removing the intake manifold. Basically you take a couple of 24mm wrenches and have at the jam nuts holding the ALDA to the IP. With the ALDA out of the way it's possible to get to the 2 bolts that take either a 10mm socket and a Philips screwdriver (I mean you can use either) that hold the shut-off actuator.

I'm not aware that there's anything in the shut-off actuator to adjust or service.

You can test the shut-off actuator easily with a MityVac. If it's good, check the vacuum lines to and from the key switch.

Sixto
87 300D
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  #5  
Old 04-14-2008, 12:50 AM
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Yeah, just check it at different points. You can go both ways with a mityvac, hook it up to the line to check if the vacuum is there (verify the key switch works), and apply vacuum to the shut off valve.

I had to do this in mine last summer. I think the diaphragm split in the valve and the engine would take five or ten seconds to shut down, if at all. Did it without taking the manifold off; just had to remove the ALDA. Make sure that the little hook/peg on the end of the new valve hooks onto the stop lever linkage inside. You did it right if the stop lever goes down when vacuum is applied to the valve.

The area is pretty easy to get to on a 602, not sure how bad it is on a 603. I had to remove the CC actuator, but it is mounted on the side of the intake manifold on the 602.962.
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  #6  
Old 04-14-2008, 08:19 AM
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The key switch works becasue when the car ignition is at off the car's rpm drops form 750 to 400 rpm.

ADLA??? On a OM603
If there is one on, then when its located???
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2008 E320 Bluetec 127k mi

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1987 300SDL 200K+
1994 S320 181K mi


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Last edited by Actros617; 04-14-2008 at 08:28 AM.
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  #7  
Old 04-14-2008, 11:54 AM
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It's too early to dismiss the key switch. A leak in the switch can mean insufficient vacuum to the acutator. It pulls on the shut-off mechanism enough to reduce but not cut fuel.

You need a MityVac with a gauge or at least a vacuum gauge. I don't know what spec is but I recall something like 14 inHg. If you aren't getting 14" to the actuator, the key switch is bad or there's a leak in the lines. If 14" doesn't shut-off the engine, the actuator is bad. A really basic test is to press down the shut-off lever and cap the fitting with your finger. If the lever springs up however slowly, the diaphragm in the actuator is probably shot. I wouldn't gamble the cost of a new actuator on that test.

If the lines haven't been replaced, you're looking for brown lines. IIRC it's plain brown from a fitting along the big vacuum line to the brake booster to the key switch and a brown line with red stripe to the shut-off actuator.

My 93 SD had a bad fitting along the brake booster line. Brakes worked fine but the there was a blockage in the nipple for the shut-off actuator. I don't know how that happened. I tapped into the the smaller feeder off the engine vacuum pump and there was enough vacuum, so to speak, to shut the engine.

The shut-off actuator sits atop the IP. See where the shut-off lever pivots on the IP. Directly above is a metal or plastic canister with a vacuum fitting. This is the shut-off actuator. Just aft and higher than the shut-off actuator is the ALDA. It's a square device sitting somewhat diagonally on the IP with a pressure fitting pointing towards the back of the car.

It's possible that your car doesn't have an ALDA. It'll run without one. I'm 99.999% sure it came from the factory with one.

Sixto
87 300D
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  #8  
Old 04-15-2008, 09:11 PM
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i am sure that i have not disconnect any line i checked it, the only thing i did is my rachet knocked the stop lever up and now its staying up when its shut off, do yo think i have to replace that switch off valve...
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Benz's in our garage
2008 E320 Bluetec 127k mi

Sold
1987 300SDL 200K+
1994 S320 181K mi


RIP SECTION

1995 E320 Special Edition [Rear ended]
1984 300SD [Head on collision]
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  #9  
Old 04-16-2008, 12:19 AM
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Quote:
Originally Posted by Actros617 View Post
do yo think i have to replace that switch off valve...
I don't think anyone can tell you based on what you described.

Does the engine stop when you press the lever?

Disconnect the line to the shut-off actuator. Hold down the lever. Put your finger over the hole in the shut-off actuator the vaccum line was connected to. Release the lever. Does it go all the way back on its own?

Sixto
87 300D
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  #10  
Old 04-17-2008, 06:19 PM
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Arrow

Have you checked the vacuum shutoff valve (white cap with brown hose)? If you played with the alda you probably scatched the valve enough to leak. It happened to me, and I had to go to desperate measures, but it still works to this day!

I used a clean DW-40 little red straw where the center of the white cap is, and stuck it down in the hole a little ways then connected the vacuum hose back. Has worked ever since.
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