SEAL-U-CUP 9X7450 - Caterpillar

Perform the following procedures in order to determine if a fuel injection nozzle does not work correctly.
Table 1
Required Tools
Part Number Part Name Qty
5P-4150 Tester Group 1
5P-7448 Adapter 1
6V-2170 Tube Assembly 1
8S-2270 Fuel Collector 1
1U-8857 Extension Tube 1
6V-6068 Calibration Fluid 1
Illustration 1 g00846800
(1) Fuel injection nozzle
(2) Gasket
Run the engine at low idle.
Loosen the nut for the fuel supply line at each fuel injection nozzle (1). Listen for the low idle to decrease or become rough when the nuts are loosened at each cylinder. The fuel injection nozzle may be faulty if the following items occur during the test:
Engine rpm does not decrease.
The engine continues to run properly.
If the fuel injection nozzle is worn or damaged, remove the fuel injection nozzle for additional testing. Note: If leakage at the nut for the fuel supply line occurs, make sure that the fuel supply line and the nut for the fuel supply line are correctly aligned with the inlet connection of the fuel injection nozzle. Do not tighten the nut for the fuel supply line on the high pressure fuel line more than the recommended torque. If the nut is tightened more, the fuel line may become restricted or the threads of the fuel injection nozzle and the nut may be damaged.Inspection and Cleaning of the Fuel Injection Nozzles
Before a fuel injection nozzle is tested, remove any loose carbon from the tip of nozzle. Do not use abrasive material or a wire brush in order to clean the nozzle.Note: Extra care should be used in handling the fuel injection nozzle in order to prevent damage to the nozzle tip. A scratch or a burr could cause needle leakage or spray distortion. Dirt in the orifices of the nozzle tip can damage engine components. The dirt can also distort the spray pattern of the nozzle.Leakage Test
Illustration 2 g00470020
5P-4150 Nozzle Testing Group
(1) 5P-7448 Adapter
(2) Fuel injection nozzle
(3) 6V-2170 Tube Assembly
(4) 1U-8857 Extension Tube
(5) 8S-2270 Fuel Collector
(6) 8T-5313 Filter This procedure tests for leakage around all components of the fuel injection nozzle.
Connect fuel injection nozzle (2) to the tooling that is shown in Illustration 2. Position fuel injection nozzle (2) so that the direction of the fuel spray is into 1U-8857 Extension Tube (4) and 8S-2270 Fuel Collector (5).
Pump the pressure to about 2030 kPa (294 psi) below the opening pressure of fuel injection nozzle (2). Release the handle. When the pressure begins to decrease, note the time that is required for the pressure to decrease to approximately 0 kPa (0 psi). If fuel injection nozzle (2) is not faulty, the time will not be less than 5 seconds or more than 45 seconds. If the time that is required for the pressure to decrease to 0 kPa (0 psi) is less than 5 seconds, too much fuel is leaking around the valve needle. Replace fuel injection nozzle (2).
Look for any leakage in the connection from the adapter to fuel injection nozzle (2). If