W123, Factory Books and Manuals

I am looking for a listing of torque values for the W123/617 engine. I see references in various repair guides - esp. on page #83 of the Diesel Performance Tuning & Repair - to "recheck torque on each of the locking nuts..." - where can I find those Mercedes factory torque references (other than the Mercedes service manual)? Are those reprinted/listed anywhere else? Also, how truly critical is it that the value cover on the 617 engine actually be officially within factory torque specs? Any elementary guidance is greatly appreciated. thank you, Kieran-

My 300 non-turbo with 360K at best gets only 19 miles to the gallon of diesel. What is this car expected to get when running perfectly? I have owned this car for 2-1/2 years now, and the mileage has always stayed in the 17 to 19 mpg range. Other than that, the car has the usual issues that the older cars do, like worn vent pods inside the dash, old rubber seals on the rear window and doors. Is there anything that I can do short of disrupting the performance to increase my mileage? Thanks.

I ahve recently been given a 1980 300d gold wagon, it is not running, why? ...I have replaced fuel filters except for the tank one also return lines, glow plugs, glow plug relay did a valve ajustment replaced battery... the motor cranks over and seems like it wants to catch but nothing what could this be ?// any ideas would be alot of help

Hey there, So I've got an '84 300D Turbo, it sat for a bit (couple of weeks) with a half-full tank of B99, which then gelled in the cold Seattle weather, so I added some Diesel to it. Now it's got tons of black stuff in the pre-filter. I'm told this could be from condensation. I've literally been changing the quickly filling filter out every couple of times I drive it, to be safe. I'm not driving far, and it gets pretty black in those couple of trips. Sigh. So.... I read a few other things & places, and it seems this is an algae (fungus?) problem. I also read I should get various Biocides, and ended up with BioBor. I haven't added it to the tank yet, and have a couple of questions. If anyone can help I'd appreciate it. There is about a 1/4 tank in there now, should I: