W123, Diesel Engine Repair

My 1982 240 D will loose power shortly after warming up, particularly noticable when attempting to accelerate or go uphill. During these times I can manually downshift the automatic transmission and the engine speed does not respond. Once I crest the hill and reach 45 miles per hour there is a sudden surge in power. I have changed all filters, and two different diesel mechanics in our area cannot figure it out. The car is a wvo conversion, and the same phenomenon occurs wether on diesel or veg. On a cold morning or when the car is first started this does not occur. Any suggestions?

I need a manual speedo drive for my transmission, I currently have the electronic version. First, can these be swapped, and second, does anyone know where I could get one. It's an 83 300d. Thanks, Brett

I was tyring to track a problem with slow engine shut-off and have solved the problem so completely that the engine is now totally stopped. While running my car with the shut off valve actuator disconnected from vacuum, a gauge on the line that supplies vacuum to that actuator and the ignition shut off to measure vacuum supplied to the actuator, the car slowly built to about -5lbs before the car rattled to a stop. The shut off valve actuator was disconnected from vacuum. The car will now crank but is not getting fuel (apparently). I have verified that there is no fuel at the return line when car cranks, no fuel moving in the prefilter. I have removed and checked the shut off actuator and shut off linkage. They are all moving freely and properly.

this is really a great forum. i have spent my mornings before work reading the archives. there is much to learn about MB's and their repair. i recomend everyone start at the last page and work you way forward. this is a vault of mechanical information ... thanks to the Bergsmas