TRANSMISSION AR 1731870 - 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 g00376593
Fuel injection nozzle (1) Connection for the fuel return line (2) Nut for the clamp (3) Clamp (4) Connection for the fuel supply line (5) Spacer (6) O-ring (7) Fuel injection nozzle (8) Seat washer (9) Hole for the fuel injection nozzle (10) Threaded hole for the spacer
Start the engine and run the engine at low idle.
Loosen the nut for fuel supply line (4) at each fuel injection nozzle. Listen for the low idle to decrease at each cylinder. Also, listen for the low idle to become rough at each cylinder.
The fuel injection nozzle may be damaged if the items that follow occur:
Engine rpm does not decrease.
The engine continues to run properly.Remove the fuel injection nozzle from the engine cylinder head for additional testing.Note: If leakage at the nut for fuel supply line (4) 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.Cleaning Of Fuel Injection Nozzles
Before a fuel injection nozzle is tested, remove any loose carbon from the tip of the fuel injection nozzle. Do not use abrasive material or a wire brush in order to clean the nozzle.The fuel injection nozzle is not a serviceable part. Disassembling or adjusting the nozzle will violate the standards for emissions.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 that is in the orifices of the nozzle tip can damage engine components. Dirt can also cause spray distortion.Pressure Test
Ensure that you wear eye protection at all times during testing. When fuel injection nozzles are tested, test fluids travel through the orifices of the nozzle tip with high pressure. Under this amount of pressure, the test fluid can pierce the skin and cause serious injury to the operator. Always keep the tip of the fuel injection nozzle pointed away from the operator and into the fuel collector and extension.
Illustration 2 g00398982
Pressure test the fuel injection nozzle by using the 5P-4150 Nozzle Testing Group . (11) 5P-7448 Adapter (12) Fuel injection nozzle (13) 5P-4721 Tube (14) 1U-8857 Extension (15)