Where does the vacuum go on a Mercedes 300D?

In all Mercedes diesel engines from the first 300D in 1975 up to the mid 1990’s, vacuum (suction) is used to turn the engine off – not electricity! In simple terms – there is a valve mounted on the rear or side of the diesel fuel injection pump. This valve has an arm attached to it that goes down inside the pump.

Are there any problems with a Mercedes vacuum pump?

Typical Mercedes diesel vacuum pump. They are very reliable and easy to rebuild if need be. The most common failure is the check valve and internal diaphragm. The very first thing I do is make sure we have a constant supply of vacuum.

Why is my dashpot not working on my Mercedes vacuum?

Because the dashpot is being supplied by the 3 way connector and that is connected to the metering valve in the supply line. The metering valve is designed to restrict the vacuum going to this area. Replace the dashpot and the connector if necessary. Next we turn out attention to the big culprits to vacuum leaks.

Why does my vacuum pump read 22 Hg?

Hook up your vacuum gage to the end and read the vacuum. As you can see we have a nice 22 hg of vacuum. The vacuum is actually a little higher than the gauge reads due to the fact that I am just pressing the hose against the opening and I can’t make a perfect seal. This tells us the vacuum pump is working properly.

How does a Mercedes diesel engine shut off?

Proper diagnosis is a must! On older Mercedes diesel engines models: 1975 to 1976 115 chassis 300D, all 123, 126, 201 and 124 chassis diesels from 1977 to 1993 the engine shutoff is controlled by vacuum (not electrical). An engine driven pump supplies vacuum to the system and a vacuum operated shutoff valve shuts fuel off inside the injection pump.

Why does my diesel engine keep running after I Turn Off the key?

When you turn the key off on your Mercedes diesel, you may have noticed that the engine will not quit immediately. In some cases it may even keep running a second or two after you have turned the key to the off position before it finally quits. That alone should give you a clue that a diesel engine uses a different approach to shutting down.

Are there any problems with the Mercedes E300?

CAR WAS PARKED IN PARKING LOT, ENGINE OFF. THE MOTORIZED TRUNK LID SPONTANEOUSLY AND FORCEFULLY CLOSED ON MY HEAD, CUTTING MY FACE, WHILE I WAS LOADING (WITH BOTH HANDS) GROCERIES INTO THE TRUNK. CAR WAS PARKED IN PARKING LOT, ENGINE OFF.

Why is the battery on my Mercedes Benz not working?

Hint: Starter Problem or Low Battery This may seem obvious, but an old battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars. How old is the battery on your Mercedes-Benz?

How to file a complaint about a 2017 Mercedes E300?

This information may be used by NHTSA during the investigation process. If you like to file an official complaint for the 2017 MERCEDES E300, you can do so by calling the NHTSA Mon-Fri 8am to 8pm at 888-327-4236, TTY: 800-424-9153. You can also file your complaint online by clicking here .

What should I do if my Mercedes Benz won’t start?

Start the car and you should be able to get around 60 psi. When the engine is running and when you turn off the engine the pressure should stay steady. Always perform this test on a cold engine. Next, make sure that the fuel injector connections are secure and not loose. Check the fuel pump and the fuel pump relay.

Where is the vacuum valve on a diesel engine?

The source of vacuum for this valve is produced by a mechanical vacuum pump located on the front of the engine. This pump either has a rubber diaphram or an aluminum piston that pumps vacuum (suction) into the system.

What causes a Mercedes Benz to not start?

In most cases you will get a fault code related to one of the following: 1 ECM / PCM computer failure 2 Camshaft position sensor 3 Shifter Selector module 4 Fault codes related to driver authorization or immobilizer 5 Electrical problems

What are the problems with a Mercedes Benz?

Top 5 Mercedes-Benz no start problems 1 Engine Click, No Start 2 Engine Dies Right After It Starts 3 Car turns over, but it won’t start 4 The car makes a clicking noise but won’t start. Hint: Starter Problem or Low Battery 5 Key will not turn the ignition More …

Why does my engine keep running after I Turn Off the ignition?

Vehicles with carburetors, especially, suffer from dieseling when the anti-dieseling (fast idle) solenoid is in need of adjustment or malfunctions. The solenoid is designed to open the carburetor throttle plates when the engine is running and shut the plates when the ignition key is turned off.

Why does my engine not shut off when the key is turned off?

This leak can be caused by one of the rubber fittings getting loose or accidently knocked off, or it can be caused by a leak somewhere else in your vacuum system (the most common on the 123 chassis is leaks in your door lock system). If your door locks stopped working at the same time the engine shut-off failed you will know the two are related.

What should I do if my engine is having a hard time shutting off?

This is the first thing you should try Engine having a hard time shutting off? Make sure to check and or replace your injector pump shut off valve. Overload protection relays are located in different places on different chassis, so check for the location of yours and follow these instructions.

Where is the vacuum valve on a Mercedes 300D?

Where is the shut down button on a Mercedes Benz?

This is located behind your ignition tumbler. Remove the instrument cluster and remove the switch’s connector by wiggling it out very slowly and carefully. Remove the three screws, replace the unit, reinstall the three screws and reinstall the connector.

What causes a fuel pump to remain disabled?

The fuel pump may remain disabled, sometimes even if the reset button is pressed, until the switch is replaced. A no start condition can also be caused by a wide variety of other issues, so having the vehicle diagnosed is highly recommended.

Can a fuel pump shut off switch wear out?

The fuel pump switch is an electrical component, and just the same as the rest on the vehicle, over time it can wear out and develop issues. As the switch has the capacity to shut off the fuel pump, issues with it can potentially lead to drivability and performance issues for the vehicle.

Where does the vacuum go when the key is turned off?

The vacuum then goes back to your ignition key assembly under the dash and back out to the shut-off valve on the back of your injection pump. When you turn your key OFF vacuum is routed through the back of the switch and on to the shutoff valve.

What does green vacuum dashpot on Mercedes mean?

Next is the green vacuum dashpot for the transmission. This is simply a metering device to supply the correct vacuum to the transmission switch. If the dashpot is leaking or not functioning, then transmission shifting can be very rough and erratic.

Why is my shut off valve not working on my Mercedes?

One of the most annoying problems that the old Mercedes diesels can have, is the shut off valve not working. You turn the key off and the engine keeps running. So out of the car you go and lift the hood to depress the stop lever. That whole operation is a pain, but Mercedes foresaw the valve failing, so they gave you a stop lever to use in a pinch.

What happens when you turn off the engine on a Mercedes?

What was the speed of a 1982 Mercedes 300SD?

The 1982 Mercedes 300SD Was Painfully Luxurious and Painfully Slow. One-hundred twenty horsepower of diesel fury. According to our colleagues at Car and Driver, the slowest Mercedes S-Class sold in the US, the S550e plug-in hybrid, runs a 13.6-second quarter-mile at 103 mph.

What was the purpose of the Mercedes 300SD?

This S-Class is a stark contrast to today’s, quick, high-tech model, but there’s something refreshing about it. Mercedes just wanted the 300SD to be comfortable, efficient, and durable, and the it definitely succeeded. This content is imported from YouTube.

When did the Mercedes 300SD turbodiesel come out?

Back in 1982, Mercedes sold Americans an S-Class that was much slower, the 300SD Turbodiesel. In period, Motorweek measured this 120-hp beast as running the quarter-mile in 19.8 seconds with a trap speed of just 68 mph.

What happens when you turn off the engine on a Mercedes diesel?

When you turn your key off, electrical power is interrupted and the engine quits immediately. Since a diesel engine does not run on electric spark, the engine has to be shut off by some other means. When you turn the key off on your Mercedes diesel, you may have noticed that the engine will not quit immediately.

Why does my diesel engine not shut off?

Since a diesel engine does not run on electric spark, the engine has to be shut off by some other means. When you turn the key off on your Mercedes diesel, you may have noticed that the engine will not quit immediately. In some cases it may even keep running a second or two after you have turned the key to the off position before it finally quits.

Is there anything wrong with my Mercedes Benz?

What’s wrong with my Mercedes? Yes, Kent has seen it first hand. Don’t neglect this! Top problems for diesel owners. Kent recommends starting with the basics Don’t just ignore your turbo charger or major problems can occur!

What’s the problem with my 1968 Mercedes Benz?

This is very common and can happen to you if you own a 1968 to 1985 diesel Sometimes you just have to take a break from working on your diesel… 🙂 If you don’t look closely this one can be hard to find! If the car has been stored or not driven regularly plan on some problems – some may be hidden!

What does it mean when your car won’t shut off?

That means the problem could be related to the vacuum pump, the engine shutoff valve, blocked vacuum hoses/lines, or leaks in the system that prevent adequate vacuum from getting to the valve. If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations.

What to do when your diesel engine won’t shut off?

Open your hood and look for a small lever with a red label marked ” STOP.” Put your thumb on this lever and push hard towards the engine until the engine stops. If the linkage is worn or maladjusted you may have to push really hard to get the engine to quit.

Why are my wipers not turning off on my Mercedes 300SD?

1981 Mercedes-Benz 300SD | Rear ended, retired in garage. Excessive speeding? It ain’t excessive till I redline! The culprit is likely to be the combination switch itself.

Where is the wiper relay on my 1979 300TD?

On my 1979 300TD wagon, I had the same problem. On the advice of an MB tech, I took out the wiper relay and banged it on my work bench. Put it back in and the problem was solved. That was several years ago. On the 123, the relay is located behind the instrument cluster; not sure on the 126. That’s also a possibility.

What kind of engine does a Mercedes 300D have?

Within that run, Mercedes produced a four-door saloon, a five-door wagon, and a two-door coupe all on the same unibody platform. Engines ranged from 2 and 3-liter diesels (with a turbo from 1980 onward) to a 2.8-liter gasoline inline six. This was the executive car to have in its day, costing nearly $70,000 in today’s money.

How old is a Mercedes Benz 300d car?

When you’re dealing with an automobile that’s more than 20 years old, you’re dealing with a completely different animal than a car from the 2000s that’s just fallen on hard times.

What to do if your Mercedes W123 is bouncing?

Engine having a hard time shutting off? Make sure to check and or replace your injector pump shut off valve. Overload protection relays are located in different places on different chassis, so check for the location of yours and follow these instructions. Car bouncing down the road?

Where is the leak on a Mercedes vacuum?

Another area of great leakage is the metering valves on the main supply line. There is a 3 way and 4 way connector on the valve. Be very careful removing the 2 connectors from the supply line metering valve. The nipples are small and very fragile and prone to cracking.

How did the Mercedes W123 bubble get its name?

This is a very special 300D turbo diesel sedan. It was named “Bubbles” by the previous owner because she felt the color looked like the color of champagne. Rather than try to tell you all about this car, I am going to have you watch a number of videos below. The first video will explain how we came to be owners of this pretty W123.

What kind of oil should I put in my Mercedes W123?

Use a diesel rated oil. Consult your owner’s manual for what viscosity to use based on your climate. Where this car is located, 15w40 works year round but a thinner oil such as 0w40 could be helpful for cold starts in very cold climates. Start by putting in about 5 or 5 and 1/2 quarts. Wait a few minutes to let it run down to the oil sump.

How big is the engine in a Mercedes W123?

Within the W123 chassis, as it typical for Mercedes of the era, cars were named after their engine size, fuel type, and chassis sub-type. Engine size was designated by its displacement in liters. So a 280E has a 2.8 liter inline-6 cylinder engine.

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