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#61
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Quote:
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#62
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better pic
I couldn't find the online manual, but still looking. Perhaps this pic is better. I don't know what this part is, but it has two male 'things' (sorry) that have nothing attached.
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Janet 1979 240 D China Red SOLD 1973 GMC Green Service Truck w/ lift |
#63
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From the Mercedes site
Since about 1977, Mercedes has used a vacuum system to shut off the diesel engine. The shut-off is initiated through use of a small vacuum diaphragm mechanism mounted on the rear of the injection pump. Mercedes-Benz calls it the vacuum box. It is also referred to as the vacuum shut-off unit or the vacuum shut-off valve. This device is connected to the fuel rack inside the injector pump. When the key is rotated to the off position, a valve mounted on the ignition switch opens to allow a vacuum to be applied to the vacuum box. In turn, the lever in the vacuum box pulls the fuel rack to the off position, shutting down the engine.
Could this be it?
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Janet 1979 240 D China Red SOLD 1973 GMC Green Service Truck w/ lift |
#64
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yeah that might be it!!!.. I am guessing that you might disconnect and try to disable that little device? I have never looked at that part of the inj. P. gonna to some reasearch... its getting intersting now!
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46 WDX Power Wagon 84 300TDT daily driver |
#65
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from my reading on the DIY pages which I have yet to be able to paste (duh..) I am guessing that the vacume shut off valve, is attached to the IP by some sort of linkage? Does it move freely? may be it is connected to the manual shut off lever? or some part of it has worn out and broken off..
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46 WDX Power Wagon 84 300TDT daily driver |
#66
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Although this could indeed be the cause of no fuel, be EXTREMELY careful here. Problems with replacement or attempted defeating of the vac shut-off on the injection pump can cause an uncontrollable engine runaway.
Please check the archives by searching on run away engine.
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1961 190Db retired 1968 220D/8 325,000 1983 300D 164,150 |
#67
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Run away diesel, why does it happen?
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#68
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run away engine
run away engine??????
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Janet 1979 240 D China Red SOLD 1973 GMC Green Service Truck w/ lift |
#69
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run away diesel
run away diesel?
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Janet 1979 240 D China Red SOLD 1973 GMC Green Service Truck w/ lift |
#70
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Diesel engine speed is controled by the amount of fuel injected into the engine. more fuel = more RPMs. the Injection pump has a governer in it which will limit the amount of fuel when a certian engine speed is achieved under normal situations. A run away condition is when (for what ever reason) more fuel being injected at a higher and higher quanity, thus engine speed will contunue to climb until something lets go.... the only way to stop a 'runaway' condition in a diesel is to remove or stop the air source. Some times that is done with a fire extinguisher.....(messy but better than blowing the engine up) Or putting a board in front of the trubocharger inlet.(air intake and such stuff needs to be removed to do this) also DO NOT USE YOUR HAND, unless you are willing to loose fingers!!!
In reading last night, I discovered that the injection pump will inject more fuel durring start up, than it does at full speed/full load... thus the posability of a 'runaway' condition. As the shut off valve, controls are attached to the inner workings of the injection pump that control both start up "enrichment" as well as shut off '"starvation" . Check the manual shut off likage closely. see to it that it is working properly with free movement. It is also connected to the shut off valve indirectly and may be a method of freeing up what ever is stuck with out getting too close to the dreaded 'runaway' situation. (taking the vacume shutoff valve assmebely )
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46 WDX Power Wagon 84 300TDT daily driver |
#71
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really dumb question
What is that lever that says off, or close? Duh and what is the alda?
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Janet 1979 240 D China Red SOLD 1973 GMC Green Service Truck w/ lift |
#72
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The lever that says "OFF" is the fuel shut off lever. I have doubts that this is your prob. 99% of the time if there is any failure at the fuel shut off, it is a vac prob that keeps the car from shutting off. W/ the engine off push/pull the lever to make sure it is not bound somewhere. If it moves freely, it is most likely not your prob. I believe range of motion is just less than 90*, but I don't remember for sure. (Someone will speak up if I am barking on this one )
The ALDA is the thing in your picture. The small canister on top of the fuel pump w/ the little plastic button on top. It's failure should not involve you not being able to start the car. The two male "thingies" coming out of it are of no consequence to your current prob. Clarify something for me: You say you have fuel, but to where? You need to, starting w/ the fuel line coming from the tank into the engine compartment, systematically go down the lines and see how far you have fuel. Where do you stop getting fuel? Do you have fuel at the IP? If so why not on the other side of it? (No one's say IP failure yet ) Also you need to make sure that all of the fuel return lines are clear and flowing back to the tank. I'll chime back in when I think of the thing that I can't remember right now... ...momentary brain freeze. -Matt-
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress |
#73
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Where the fuel is
there is fuel in the pump and in the filter, but no fuel comes out of the injector hose when the engine is cranking. Is it possible to blow out the fuel injector lines, or is that even an option.
At least we're past the glow plugs regarding the IP. I would assume there would be some symptoms. I've had other injector vehicles and they struggled before the went down. This one started up, and ran well. No hesitation, no nothing. I wouldn't have thought it was a fuel issue at first. In fact, I saw the post regarding the 240D race. Mine would get up to over 70 mph. Never did find out just how fast it could go. Sign me up.
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Janet 1979 240 D China Red SOLD 1973 GMC Green Service Truck w/ lift |
#74
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When you pop the nut on the top of the canister style fuel filter and crank does it shoot fuel all over hell? (...hell being the engine compartment at this point...)
Unhook a couple of the injector lines on top of the pump. Does fuel come out there during cranking? Did you fuel up in the day or two leading up to this happening? Just trying to eliminate possibilities. I am sure there are several of us here following this that wish we could just get our hands on the blasted thing!! Damn I miss playing w/ these cars... -M-
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress |
#75
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Hey man to seal off the vaccuum just lock the driver's side door. I have a 79 300D and the vaccuum system has various leaks all throughout the doors, so I just have to get in and lock the driver's door by pushing the knob down when I start the car. This makes the car shutoff w/out having to get under the hood and press the Stop mechanism. This will seal off the vaccuum making it able to shut off properly.
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