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

1980 300D over charging battery

I have a 1980 300d and my alternater is over charging. Its between 13.5 and 16v. I was told this could be as simple as it not being grounded. I fear it may be the alternater. Being that I am broke...the ground would be the best problem for me. I was wondering if the alternators in these cars had a seperate regulator or if it was built in and if there were any things I could look for before i spend the money on a new alternator.

Thanks guys

Brent

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1985 300td vac pump caged bearing?

Hello, Kent. I have done a lot of work with your great parts and books. I was rebuilding my vacuum pump and wondered if it wouldn't be a better idea to rebuild a used one that has the trapped bearings on the piston actuator (don't know the actual terminology here). I'm concerned about the old bearings in mine and the possiblity that they could drop into my timing chain. They feel a little growly when I turn them. Do you have any used pumps with this bearing?

-Jeb Fowler

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

85 300SD Aux Fan will not turn on when pressure is high

I have been experiencing a couple of problems with the AC. One was the compressor clutch "cooked itself" resulting in it being replaced. After it was replaced I noticed the aux fan was not ever coming on and the clutch still has moments where it is not completely engaging and is partially engaged resulting in it heating up. I have troubleshot the aux fan down to the resistor used for a slower aux fan speed. It appears to be open and should be replaced. Could the failing of the aux fan cause the slipping of the clutch and how difficult is it to replace the resistor?

Thanks

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

1984 126 300SD Courtesy Dome light misbehaving

Hey guys,

My dome light (one right above the rear-view mirror) will not come on (in any of the positions) when the doors are opened in the car. The door lights that are on the bottom of the doors do operate as expected so I suspect the switches that detect the open door are working. I can turn the light on by rolling the knob to the "on" opsition. Is it safe to assume that the platic light assembly needs to be replaced? Can I clean the contacts? Is it two different bulbs?

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

93 190E ABS light on and off

Good afternoon,

first let me say that I recently found out about this site and I'm very happy that I did cause you guys have great line of products.

I just ordered the tune up kit for my 190E and looking forward to order some more parts.

however, the reason for this post is that I was wondering if you guys would know why the ABS light on my 190E randomly goes on and off.

I have a 1993 190E 2.6L and since I've got the car, this problem has always been there. Also I notice that every time the ABS light goes on, that the engine loses some power.

Chassis Model Number

W201

Forums

Body and Interior Specific Aid

82 240d intake manifold help

when I pulled the air cleaner to remove linkage for a valve adjustment, I noticed a butterfly flap inside the intake manifold that can be adjusted to open or close. mine stay mostly closed until the thottle was down about 3/4 of the way and then just opened 1/4 of they way at full throttle. when and how far should this open for the best perfomance. my car is really slow but I've been getting it better with lots of tuning but still needs all the help I can get.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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