W110 W111 W112 Sedan, BENZ AID - COMMON QUESTIONS AND ANSWERS

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Chassis Model Number

W126

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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Instructions

Chassis Model Number

W126

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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Chassis Model Number

W123

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.

Chassis Model Number

W115

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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.

Chassis Model Number

W115

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Diesel fuel injector replacement issues

I am replacing the injectors in my '83 300SD. The rebuilt Bosh injectors came with new crush washers. I also have a new set of crush washers from mercedessource, which came with the fuel return line set. The issue is that the openings in the Bosh supplied crush washers are somewhat smaller and the crushable ridge is not as high as on mercedessource washers. Does this make any difference? Which washers should I use? I need an answer on this quick as I am doing this job right now.

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Grinding Brakes

Hello, I just did a complete brake job on my 1979 300SD. Replaced all the rotors, calipers, and brake pads, as well as the master cylinder. It all went fine, except now when I turn, there is a grinding noise that comes from the front wheels, it's like the brakes are grinding, but it only happens when I'm not driving straight. Any Suggestions? Thanks, Jeff

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Chassis Model Number

W116

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'86 190e wiper switch stuck in on position, radio on, unless turned off manually

This morning I got in the my 190e and the radio was on, started OK, thought battery might be dead. Then turned on wipers, soon after smelled burning rubber, thought it might be coming from a construction site, only to find I could not turn off my wipers at the control stick-they are still on. It will not rotate, high beams work fine on and off, so do turn signals. So I have an electrical problem, I'll remove the cover to access the wiper, turn switch, no doubt, I'll see some major melt down there. Has anyone else had electrical problems with their 190e. I've just been driving this one for a week, I purchased it from a dealer with 97K. Where else should I be looking for problems that perhaps resulted in this issue I have this morning?

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Quick Fix Instructions

Chassis Model Number

W201

76 300D thumping noise

I have 76 300D that makes a thumping noise that I was certain was the exhaust pipe hitting the chassis/frame. I know this noise and was very surprised to find the exhaust pipe was tight and not the source of the noise. It is related to engine shake at idle. The car starts/runs great but has always had a rough idle. It only makes the noise when the car is stopped in drive. The car will stop making the noise if I shift to neutral. I think there is more to it than the change in rpm caused by putting it in neutral.

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Chassis Model Number

W115

450se hydraulic lifters

the left hand bank hydraulic lifters are not working. this happened while the engine was ticking over at 800rpm. the revs dropped off gradually until the engine syopped. all the lifters do not rise even though the oil pressure while cranking the engine is good. i am using the "left hand" term as stated in the manual,it is actually the right hand bank when view from the front of the vehicle. any ideas?

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