W126, BENZ AID - COMMON QUESTIONS AND ANSWERS

1991 Mercedes 300D Turbo Diesel - HELP!

Please help me. I have a 1991 MB 300D 2.5L Turbo Diesel. When I attempt to start the car, it has trouble staying in idle. I have to pump the gas pedal 4-5 times in oder to get the engine to run and have the gas pedal down at least half way to keep the engine running. As the engine runs, there is a cloud of white smoke coming from the exhaust. There is no blow-by, however when I uncap the radiator cap, a froth of bubbles rise after 5 minutes or so of running.

Chassis Model Number

W124

Forums

Body and Interior Specific Aid

617 turbo valve stem seal differences?

Hi all; Well, I screwed up. I was just about to install the valve cover after replacing all 10 rubber valve seals and a valve adjustment and realized that I installed the seals on piston #3 backwards... I don't want to go back and do the job over now, if I can get away with it. I planned on changing the chain with the next valve adjustment, and I wouldn't mind getting another valve seal kit and re-doing the job then. Anyway, what would the consequences be of "leaving it as it is" for the next 12,000 miles or so?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1984 300sd horn circut has no power?

Hi, I have recently aquired a 1984 300sd with a horn circut problem. I have replaced the #14 fuse, checked the wiring and contacts, and replaced the actual horns. The wiring is all in great shape, including the ground wires. There is simply no power to any of the accessories on the #14 fuse. Is there a relay for this horn? I can not find one listed for this model. I am ready to just run a secondary horn circut and switch for the time being so that the car will pass inspection, but I deeply desire to restore the original horn function. Any ideas or help will be greatly appreciated! Thanks

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

84 300d hard/won't start warm

I just got the car. its a 1984 300d The engine sounds and drives very good; smooth and quiet, scored really great on emissions, %3 opacity. The problem: when warm, if I shut it off for more than a few seconds it won't start, like it's not getting air; egr maybe? If I wait for about 15 minutes, It will then fire just fine with a bump of the key. I figured out, through necessity, that I could repeatadly bump the key to get a start after 5 or 10 bumps, but had very little power with that method, (lack of turbo?). this sound familiar to anyone? thanks first post

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

82 300D Idling too fast

Hi Kent, Brook here...(of the Larry Mans clan)... 1982 Turbo W123 My car (Sherman) is idling way too fast these days. I took it into my MB shop at closing time the other day, so they didn't have much time to diagnose but we did notice that the "arms" that one pulls on from the engine to "rev" the engine (say, during a diesel purge) are sticking somewhat and not allowing the engine to relax into a normal idle. My mechanic sprayed some lubricant on the arm "joints" hoping that would release them a bit and yet after a few days, it's still happening.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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