Questions and Answers

Biodiesel additives needed? + warnings

I converted the fuel lines on my '82 300DT and plan to run B100 biodiesel consistently. I heard about the need for adding lubricity to low sulfer petrodiesel but does anyone know if too low of lubricity is a problem with biodiesel? The only fuel addative I have used so far is a product called "Killem" to clean out the fuel tank.

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Diesel Engine Specific Aid

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Chassis Model Number

W123

300D turbo running hot

What is the normal running temp for my 83 300D? Right now it gets hot quickly and moves up above 90C and will approach the 120C point if I run the AC. I've changed thermostats and flush the radiator and put in new coolant along with a water wetter. Seems to run somewhat cooler but not what it should be. The electric fan used to come on but doesn't now. What is the most common thing I should look for if the fan doesn't come on? Thanks, Dan

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Body and Interior Specific Aid

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Chassis Model Number

W123

4-matic question

recently purchased a 91 300te 4-matic, and need info on status of 4-matic operation. at start up, lights for 4-matic do not come on, nor do they when car is operating. other dash check lights do come on, though not all. the manual "4-matic funktion" switch in the engine compartment is on the "1" position, so i assume it is engaged. How do i know if it is working? how do i know if the dash light for the 4-matic function is burned out, or non-operational?

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Body and Interior Specific Aid

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Chassis Model Number

W124

Diesel ign. switch problems

I have never really understood, on our 123's, why I have to return the key all the way counter-clockwise if the engine fails to start. Strange voodoo with the vacuum shut-off? A peculiarly odd tuetonic accomodation for the hearing-impaired? What prevents it from functioning. Every now and then I have trouble with the switch stopping before the crank position, no matter what I do. Is this something that popping the cylinder and spraying WD40 would help? It is so intermittent that I could go for weeks without it happening again, or I could get stuck at the drive-up tomorrow. Thoughts?

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Diesel Engine Specific Aid

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Chassis Model Number

W123

Water in 73 450SE

Hi All: I have some water accumulating in two places, I cannot find the source of either. In the trunk, behind the driver side wheel well. The gaskets on doors and trunk are all new. There is a small seam in the rear window gasket. Also, there is water draining from the car, under the driver side front door. I cannot see anywhere that this could be coming from. Thanks in advance for any help. Jon P.

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Body and Interior Specific Aid

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Chassis Model Number

W116

Diesel "wobble" & groaning turning right

I have a 1984 300SD & it has developed a "groaning" sound when I turn right. I jacked it up & with the car running turned the wheel, no sound (most likely because it does not have the weight on it). I grabbed the tire I turned the tire hard manually & got a little noise from what I believe to be the "Guide Joint" on the top of the Steering knuckle. It looks to be in great shape. Any tips to solving or isolating the problem?

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Body and Interior Specific Aid

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Chassis Model Number

W126

Timing 75 300 D

1975 300D 1975 300D Cam shaft removed, injection pump removed. When cam shaft is re installed, Injection pump re-installed, Cam shaft mark lined up with TDC on Crank Shaft Pulley. Injection pump marks Lined for timing. Question: Is there any other timing marks that needs to be in line???? I read somewhere the the Injection Pump (DRive Gear) should be lined up with some yellow Dot on gear, which I can not find any dot on drive gear for injection pump. Sorry for the confusion in last question.

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Body and Interior Specific Aid

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Chassis Model Number

W115

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