[AT] Standard Ricardo Injection tubing

[James Peck]

That squares with the Mercedes injectors cracking at 2000 psi. I would be comfortable using 2800 psi if 2800 psi rated tubing is the same size as the leaking tubes.

51 years ago I spent some time doing locomotive injector rebuild and testing. Its been 51 years. I do not remember the cracking pressure. Might have been 1650 psi. That was for Alco and GE injectors. 

EMD injectors were directly stroked by the camshaft. We tested them by stroking with a lever. I do not remember seeing a pressure. The 2 stroke EMD engines have been phased out.

Cecil Bearden AT List member, Oklahoma farmer, and Professional Engineer (crbearden at copper.net); The Perkins A3.152 engines I worked on had a CAV pump and used an injector set at 1750 to 1800 PSI cracking pressure.  If the pump was a little weak we would drop the cracking pressure down to 1600-1650.  It would help starting if the tractor had a good battery.   It advanced the timing of the injection some.  By lowering the injector cracking pressure, we could make a weak head/rotor combo last another  200-250 hours.  

James AT List Member (jamesgpeck at hotmail.com); You were correct Cecil. I have included the Parker fittings brochure again. Some of the steel fittings are rated to 2800 psi. Any  tubing or other component nneds to have a working pressure rating that excedds the injection pressure.