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.