Where is the vacuum valve 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.
What happens when you turn off the engine on a Mercedes?
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.
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.
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.
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.
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.
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.
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.
How does a shut off valve on a diesel work?
The shut off valve will pull the linkage toward itself. If you get the valve on the other side of the internal linkage, it would force the linkage to the full throttle position. To install just take the new valve and install the new gaskets on either side of the metal disc that came off the old valve.
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.
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.
How does a diesel fuel pump shut off?
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. When vacuum (suction) is applied to this valve, the lever moves and shuts the fuel flow off 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.
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.
Is there a vacuum system on a Mercedes?
Vacuum, vacuum everywhere, or you wished it was. To many owners of the older Mercedes diesel cars, the vacuum system continues to be an amazing mystery. Full of weird components and even weirder operation of all kinds of stuff on the car. Well I am here to tell you today, it is not that complicated and mysterious.
What to do if your Mercedes vacuum starts leaking?
Be very careful removing the 2 connectors from the supply line metering valve. The nipples are small and very fragile and prone to cracking. If one breaks you will have to replace the entire line. Its not very expensive, but if it is not is perfect condition, then it will leak. Next is the green vacuum dashpot for the transmission.
How to test yellow lines on Mercedes vacuum?
Replace the 2 one inch pieces of vacuum attached to the check valve also. To test the yellow lines, hook up your hand pump to each line with the other blocked off, and see if you can pull and hold a 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 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.
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 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 are the overload protection relays located on a Mercedes Benz?
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? Fix it by replacing your worn out front shocks
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?
How do you change the shutoff valve on a Mercedes?
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. Replacing the shutoff valve is not hard, but if done wrong can destroy your engine.
When did Mercedes Benz start making the 190?
Mercedes-Benz started production of the 190 and 190 E models in 1982; the 190 D and 190 E 2.3-16 followed in 1983 and 1984, respectively. The first two models, both gasoline-powered, were fitted with four-cylinder engines with a displacement of 1997 cubic centimeters, delivering 90 hp (66 kW) and 122 hp (90 kW), respectively.
Where is the oil level sensor on a Mercedes 190?
It is mounted on the engine bell housing, on the same side as the oil level sensor, just a bit farther back. You can get to it by removing the front lower panel, as you would do when changing your oil. Look a bit farther back than the oil pan, on the bell housing, and it is a little black thing with a wire on it which points straight up.
Why are the fans on my Mercedes 190 not working?
ELECTRIC FAN AND ENGINE FAN TROUBLESHOOTING –It seems that every few years, both fans stop working. Oftentimes it is the red three pole temperature switch, and the system is fairly easy to test. The idea is that when the switch is heated by the coolant to a certain temperature, the switch provides a path to ground and the fans engage.