STARTING MOTOR GP-ELECTRIC 4904846 - Caterpillar

Nozzle tester for pencil-type nozzles-8S2242 Nozzle Tester Group shown.If you make tests on large quantities of pencil-type or capsule-type nozzles, use two testers. Use a tester for each nozzle type. This prevents leakage by eliminating repetitive tightening and loosening of the line and adapter on the tester. The former 8S2242 Group can be used for all nozzles in 1100, 3100, and 3208 Engines
Tips For More Exact Tests
... You do not need to make tests on new capsule nozzles, but if you do make a test, install the nozzle in a precombustion chamber and tighten to the correct torque. Remove the nozzle and make the test. The tightening forces can seal the internal parts the same as if the nozzle were installed in the engine.... Do not make tests on hot nozzles. High temperatures reduce the fluid viscosity and cause too much "leak down" (pressure drop).... If the calibrating oils listed in the Special Instruction are not available, use a diesel fuel in the API range of 35 to 41 at 60°F (16°C). With diesel fuel, the specifications for PC (precombustion chamber) capsule nozzles are:Used PC Nozzles (With Diesel Fuel)
Pressure to Open Valve (VOP): 400-750 psi (2750-5200 kPa)
Rate of Leakage:
With a pressure of 300 psi (2050 kPa), pressure reading must not be less than 100 psi (690 kPa) after 30 seconds. Therefore, permissible pressure drop is 200 psi (1380 kPa).
New PC Nozzles (With Diesel Fuel)
Pressure to Open Valve (VOP): 685-750 psi (4720-5200 kPa)
Rate of Leakage:
With a pressure of 600 psi (4150 kPa), pressure reading must not be less than 200 psi (1380 kPa) after 30 seconds. Therefore, permissible pressure drop is 400 psi (2750 kPa).
Test specifications with different test fluids are not known for the direct injection nozzles.