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Originally Posted by jbaj007
I used a small bottle jack (Craftsman 2 ton, I think) and removed the top nut (really torqued on there!!!).
Take apart the cylinder of the jack and remove the center rod and seals (like on a master cylinder).
There is an inner cylinder, that the center rod was in, that is the pressure chamber of the jack and there is a small hole near the top of this inner cylinder. Seal that little hole (weld it or I just used JB Weld).
Drill or grind out the hole in the top nut where the center rod passed thru and tap it for a bushing (mine was 3/4 NPT, I believe).
From there it's a matter of some plumbing fittings and an old injector line. The metric adapter to mate up with the other copper fittings and to the injector line was difficult to find; I can't remember if I had to do a little "thread adjustment" with die and tap to go from pipe thread to metric. It takes a little finagling, but, if I can do it, you can, for sure. FWIW 
Edit: I think this is where I found the metric/NPT adapter (at least it was in my "Favorites" folder for something): http://www.fittingsandadapters.com/metric.html |
I want to thank you for your valuable contribution. I built myself a diesel injector tester very much like the one you describe here and it works brilliantly!
I tapped the bottle jack for 3/4" NPT, and JB welded the bushing in, as there was not much thread. I also JB welded the setscrew I tapped into the pressure relief hole in the cylinder. For adapting the MB injector line to the standard plumbing, I used a 1/8" NPT to 6mm OD metric compression fitting on a sawed-in-two line - no thread adaptation necessary! I have a complete parts list from McMaster-Carr if anyone is interested - the total bill was less than $60.
I tested a set of used NA31x injectors with a fluid mix of ATF and Marvel Mystery oil - had good spray patterns, nice popping, and as far as I can tell, consistant pressure relief at 1850-1900 psi.