Electrical
Knowing How to Use the Cruise Control Lever on Older Mercedes
We share with you the factory instructions for most models from the late 1970's to late 1980's
W116, New Parts Kits and Manuals
1979 300SD automatic trans vacuum modulator valve ??
Hello
I sold my fourth and most recent Mercedes (1981 240D) in March. Couldn't stay away long, and am planning on looking at a 1979 300SD this weekend. I've had four diesels, (1982 240D, 1985 300SD, 1985 300D, 1981 240D) all automatic, since 1996.
The seller tells me that the transmission "sticks in second". Sounds to me like it might be a modulator valve issue, but since I can't even find a parts listing anywhere for a modulator valve for that car, I'm now wondering if that car came equipped with one at all.
Chassis Model Number
Forums
Engine
Diagnosing Diesel Engine Knocking Noises
Diesel Purge can help you isolate the noise
$104.50
W107 W126 Chassis 380 V8 Engine Thermostat and Short Hose Replacement Kit
For 380SL, 380SLC, 380SE, 380SEL and 380SEC. When replacing an old thermostat always replace the short hose that it is attached to!
$15.95
Power Steering Fluid - Per Liter
All Models with power steering from 1958 to 1985
Transmission
1968 to 1981 Automatic Transmission Won't Go Into or Slips Badly in Reverse
Yes, you are fortunate there is an adjustment!
Transmission
Rattling or Loose Automatic Shifter Linkage
New bushings will solve the problem and possibly prevent disaster
Fuel Delivery
Fuel Leaks Between Diesel Fuel Injector Body Halves
More common than you think and easy to fix with right tools
$114.50
Late 126 Chassis Rear Subframe Mount Kit
Fits 420SEL 300SDL 300SE 300SEL 350SD 350SDL 560SEC 560SEL
$104.00
126 Chassis Rear Subframe Mount Kit w/ Instructions
Early W126 Chassis Gasoline and Diesel models ONLY. 1981 to 1985 300SD, 380SE. 380SEC, 380SEl and 500SEL