So several years ago my son and I spent a Saturday building a soda bottle rocket Iaucher and I posted some pictures to Reebs thread: weldingweb.com/showthread.php?t=46678 Ever since that thread I have really wanted to do some hydrostatic testing of some pop bottles. I know from experience that most let go someplace between 175 and 200 psi. But I really wanted to be able to play. I have looked at commercial testers like Wheeler-Rex that do 300 psi and 1000 psi but they are a bit more than I wanted to spend for a "toy".
So a while ago I recall seeing someone that had made an injector tester from a cheap hydraulic jack... and I thought that may work... so a few minutes reading and I was ready to start building. http://www.peachparts.com/Wikka/DieselInjectorTester
Being that I have a lathe and such I decided to improve on the design a little.
Pic1 open the jack with a big wrench
Pic2 drain all the oil
Pic3 turn a part that is 21.95mm for about 25mm (1 inch) then step up to 23.95mm for about 50mm (2 inches). The length of the second part could be as long as the bore. You just need to ensure the seal is below the relief hole. Test fitting the top.
Pic4 drill 5/16" hole clean through.
Pic5 tap for 1/8" NPT
I didn't get a picture after I cut the groove for the snap ring. More pictures coming.