BENZ AID - COMMON QUESTIONS AND ANSWERS

300SD Adjusted valves by the book, now won't rev ???

n/aI am new to Mercedes and just bought a nice running 1982 300SD. I wanted it to run nicer so I adjusted the valves. Now it acts as though the throttle is not connected, but it is. Can't hardly get it above idle, even when I push the throttle rod at the injector pump. Starts easy, sounds good,
no smoke. I rechecked the valve adjustment, it is spot on .004 intake, .014
exhaust. I had layed the linkage over to the side, don't think I bent
anything-but the speed control actuator does feel limp wristed-that is no
tension. I double checked linkage-seems correct-the rod to the injector pump has about 3/4 to 1 inch of travel-is that normal? Don't know how I could have
changed that. Could the supply pump coincidentally failed? All hoses in right

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

Dash smoke 1977 300D

Have experienced following:
1. Attempt to start - no crank and smoke comes from driver's side speaker area. Wait 10 minutes, try again, cranks and starts fine with no dash smoke.
2. Attempt to start later - again no crank, more smoke. Wait 10 minutes, cranks slowly but starts, no smoke.

Examination under dash reveals oil around ignition switch. My current thinking is to rebuild the vacuum pump and clean out all the vacuum lines I can reach.

What to do about the ignition switch? As I understand it, the switch is attached to a vacuum element that must have been polluted. It seems like the switch itself is now polluted too. Should I replace switch alone after vacuum pump rebuild? Or switch and vacuum element together?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

83 300SD starter removal tips?

Hi:

My starter motor spins and will not engage 4 out of 5 tries, so I need at least a new solenoid.

It looks difficult to get the solenoid out, what with the heat shield blocking the wiring, and because I can't seem to break the (3) screws loose.

I figure the starter has to come out to replace the solenoid. I may replace the entire unit.

It looks like the exhaust head pipe has to move, because the starter looks too big to slip out any other way. Moving the head pipe will also make access to the two starter bolts easier.

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

Fuel leak into trunk 82 123

I recently parked my car on a steep hill with the passenger side downhill. When I returned to my car there was fuel leaking down the street and inside the wheel well in the trunk. I unclogged the rubber piece that lets water out of the trunk and drained the fuel out. I use biodiesel and I don't see any worn through parts. Any idea how the fuel got into the trunk, all seems normal now but I wanted to make sure there weren't any safety issues.

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

84 300SD lock cylinder removal

The key had been sticking when I first tried to turn it over. One morning while in a rush to get the kids to school I put a wrench to the key to make it turn. My problem went from not starting, to not turning off when I turn the key off. The key now turns VERY freely and the steering wheel doesn't lock. I am trying to replace the whole lock cylinder but it doesn't want to leave its home. The cover sleeve won't even budge. The marks on the sleeve(0,I,II) have never lined up with the notch on the cylinder. Is there an alternate route to removing the lock cylinder? Or does anyone know how to get me out of this jam? It is very disheartening to pull into a parking lot proudly driving my old MB, only to pop the hood and press to e-stop to turn the engine off.

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

Pages