W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

1983 Mercedes 300D-T not starting

My car will no longer start. For a while when I turned the ignition key, I had to wait between 2-5 secs for the engine to start. Now, the starter is turning over, but other than that--nothing. The glow plugs seem to be good (I tested them at the relay without removing); the battery reads 12.3V (I know this is on the low side, but even with the car jumped by my other working vehicle, the car still won't start); and I just changed the fuel filter (I've been running biodiesel for 11 months and have changed the fuel filter 4 times since then) thinking this might be the issue. Still, nothing....

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Diagnosing a worn out diesel

Hello, I have excessive oil blow by comming out the breather tube, so much so , that my air filter is about 35% covered in oil. I also have a distinct metal knowcking noise at idle speeds, seems to be comming from the front of engine but cant be sure. I read your " why does my diesel leak" manual and it said something about a cam going bad...how do you check this? I have done my valves( also with your cool tools- excellent!) and forgot to check the cam, and Im not sure what to look for. Also how do you check the timing chain? Thanks in advance James

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87 300TDT Turbo spool up LOUD whine, engine runs but sluggish.

I have a 1987 300TDT with 119,000 original miles bought a year ago from the original owner. Yesterday while accelerating abruptly in traffic I heard a loud wind up sound (like the turbo was out of control), a loud "clink" sound from under the hood, and a puff of grey smoke followed- all within a 2 second range. The rest of the way home (about 8 miles) there was a lack of power and that same wind up sound- only in the range that the turbo would normally kick in: My question is of course... What is it and how to fix it? this is the 603 Diesel 3.0L 6cyl.

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560 Engine in 420SEL?

Hey Kent, Are the 420 block and the 560 block about the same size? I found a valve cover thats off a 560 that will fit my 420. Are the block and heads the same, just the stroke is different.I am going to pick and pull tomorrow for the valve cover and safety belts. Should I just grab the engine and use some parts for my 420 or even put the 560 inplace of the 420?

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differential removal

Kent, Can you give a short summation on how to remove the differential on my 82 sd? I recently purchased one that howls very loud, and the previous owner supplied one with the car. I do have a car lift, tranny jack, tall jack stands. Just looking at it, I would unbolt it from the body, lower it, drain out lube, take rear cover off, remove axle clips (Pin), remove rear wheels, loosen axle nuts on hub, and go from there. Any help is appreciated. Thanks, Bill

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instrument needles jumpy

Hi, I have a 1982 300TD. I am experiencing some strange instrument cluster behavior and I'm wondering if someone might chime in on how to fix it. I've removed the cluster a few times to make sure that all connections are sound and as far as I can tell, they are. Quite randomly, the fuel gauge and the temperature gauge start to jump a bit. If I switch the headlights on, the fuel and temperature needles get more jumpy, the buzzer goes on and off and the instrument cluster light turns off. The pressure gauge and others work as expected though I have to use a flashlight to see it. Thanks!

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cooling system/overheating 1975 240d

HI- just installed new water pump, hoses, new thermostat, new belt, radiator was checked over and is fine, put the new thermostat in pot of boiling water and watched it open, then close after removing so I know it is good. car now overheats immediately (like within 2 or so minutes), so I have not driven it longer than that until I figure this out. The temperature sending unit is new, it isn't the gauge because its the same thing with either of 2 gauge clusters I have.

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220d acceleration smoke

hello out there. I'm trying to troubleshoot a smoke problems with my 1973 220d. The main problem is that I don't know what to expect from these cars. After installing the updated glow plug system, one rocker arm/shaft assembly, and removing the injectors to check them out, the car runs great and steady. At idle, the smoke is not bad at all, but if I goose the throttle, black smoke billows. It puffs smoke pretty good when accelerating and under load. From what I have read, this could be the vacuum pump or fi pump diaphragm. I had the back off of the pump and the diaphragm "looked" good.

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