I used the cheapo Harbor Feight Diesel Compression Tester , they had a more expen$ive one that listed Mercedes but as long as you have the correct threads (10 or 12 MM IIRC) you're good to go .
I'd adjust the valves first as they're _always_ tight and tight valves make for lower compression when the engine is otherwise in good shaPE .
-Nate
Jon wrote :
>
>
> What is the procedure for compression testing an MB diesel engine
> (1979 3.0L NA I think that would be a 617.912 or something like that)?
> I've done it on gasoline vehicles many times, but is there anything I need
> to know special? I know it's through the fuel injector holes, and a high
> pressure guage is needed. But, anything else? Anything I need to be
> careful of?
>
> Any way to tell if bad compression is caused by valves or is it
> caused by rings? (Besides pulling the engine apart) I guess either way,
> the engine needs to be pulled apart. :-)
>
> Thanks,
> Jon
>
> --
> Jon Kenneke, General Manager
> Kenneke Communications - http://www.kenneke.com
> PO Box 3126 - Albany, OR 97321-0702
> Radio Takena KTK - http://www.radiotakena.org
>
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