I have a 92 300SD and I would like to check the tension for the chain and also check the valves gap, as well as the injection timing. The problem is that I don't know how to do none of this work. Please any suggestions how to perform this task I would really appreciated. If there is a link that you may recommend I would appreciated. I been doing a a lot of reading on this site but I do not see any thing on 6 cyl motor.

I believe your Engine has Hydraulic Valve Lifters so there is no gap that needs adjusting.
If theses PDFs work (they are for a 603.960 engine from an 86 300D) there is stuff about the valve lifters and camshaft timing.
http://mb.auto.pl/wis/w124/CD01/Engine/602_603/05-2010hw.pdf

http://mb.auto.pl/wis/w124/CD01/Engine/602_603/05-2011hx.pdf

http://mb.auto.pl/wis/w124/CD01/Engine/602_603/05-6010hw.pdf

Here is the DIY section of the forum:
http://www.peachparts.com/shopforum/forumdisplay.php?f=82

Your IP timing is supposed to be set with and electrical setup that screws into a plug hole in ths side of the IP (after you remove the plug itself).

I could not find other information on the timing of the IP.

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84 300D, 82 Volvo 244Gl Diesel

More Info
In the pdf how the Fuel Injection Pump is rotated while the Engine is running is on page 8 of 89 pages.
The method to time the Fuel Injection Pump is the; Reference Impulse Verfication method (RIV) (there is also some info on the RIV method in our DIY section) on page 16 of 89 pages and on the next page is a diagram of the equipment.
To go to the pdf:
http://mb.auto.pl/wis/w124/CD01/Engine/602_603/07.1-0010.pdf

There may be more useful info in that pdf but it got to tedious for me to look for more.

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84 300D, 82 Volvo 244Gl Diesel

Thanks a million Diesel911. This is a great information. I'm reading some threads about the Ip system, but this link is the most comprehensive information I have seen. Thanks again and I know other people will benefit from this link as well I am.