The Petrotest® Diesel Injector Rig was designed for Shear Stability testing. The complete assembly consists of a 2-cylinder Bosch injector pump, drive motor, contactor solenoid switch, atomization chamber with interchangeable spray nozzle, filter distributor plate, glass funnel with cooling jacket thermometer (-10° to 100°:1°C), manometer, digital (6-digit) stroke counter, interconnecting tubing and l-liter of RL34 Reference Oil.