YOKE ASSEM. 2V7089 - 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     1    
6V-6068     SAE J-967 Calibration Fluid     1    
Illustration 1 g00691280
(1) Fuel injection nozzle (2) Seal (3) Cap (4) Spacer (5) Gasket
Illustration 2 g00749601
(1) Fuel injection nozzle (5) 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
Illustration 3 g00457586
Fuel injection nozzle components (1) Nut (2) Body (3) Shims (4) Spring (5) Rod (6) Spacer (7) Nozzle (8) Nozzle nut (9) GasketBefore a fuel injection nozzle is tested, remove any loose carbon from the tip of nozzle (7). 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.Perform the following procedures to inspect the fuel injection nozzle.
Place nozzle nut (8) in a vise. Turn body (2) in a counterclockwise direction in order to disassemble the fuel injection nozzle.
Disassemble the fuel injection nozzle. Inspect each component for the following conditions: sticking, wear, scratches and cracks. If any component is damaged, the fuel injection nozzle must be replaced.Note: All components of the fuel injection nozzle must be kept clean. Keep the components in clean diesel fuel.Note: Before a new fuel injection nozzle is installed, soak the nozzle in a light oil. Calibration fluid can be used. Heat the oil to a temperature of 50 to 60 °C (122 to 130 °F). The oil will remove anti-corrosion material from the fuel injection nozzle.
Reassemble the fuel injection nozzle. Refer