I've talked about this book from Bentley publishers.
ON Amazon for 26.00 . I'm a newbie to MBs and relatively new to diesels and engines and cars work in general and I found this book very helpful and intriguing. The non related articles are helpful too for expanding the mind of a new wrencher. Here is a maybe not complete list of articles I found relevant to our cars. Plus the Technical discussions sections at end of chapters all have a few relevant things.
Chapter 1)
Choosing Repair Shop
ATF
How To Service AT
Servicing the W126 300SD parts 1 and 2
On Board Diagnostics for Diesels
Technical Discussion
Chapter 2) Engine Transmission
W124 Motor Mount Replacement
How to replace your 300SD Water Pump
300SD Timing Chain Replacement
Timing Is Everything
300D Top End Work Hints (valve seals, cam chain, and fuel injectors and rebuilding vacuum pump)
Valve Job, Parts 1 and 2
Bottom End Overhaul 1 and 2
A Survey of ATs
Tech Ramblings
Transmission Lockout Switch
Chapter 3) Diagnosing Pre-Glow Systems 1 and 2
Turbocharger Repair
Replacing 300D/E Exhaust Systems
Water and Diesel Fuel Dont Mix
Chapter 4) Electrical System
5 minute Shift Indicator Light Fix
Advanced Radio Repair: Becker Grand Prix Electronic
How To Refurbish Your Crues Control Actuator
Horn Rings
Installing a 3rd Brake light
The AlternatorReplacing tH Antenna on W126 Chassis
Installing Euro Head Lamps on W116 300SDs
Chapter 5) Body, Interior
How to Fix Vacuum Door Locks
Vintage Trip odometer
Repairing a stalled Odometer
Servicing the VDO Mechanical Clock (I'm getting right on that one
)
Gray Market
I'll post rest another day. Too much typing.