BOLT 8T3666 - Caterpillar

Specifications
Table 1
Specifications for Testing the Fuel Injection Nozzles
Bench Test Temperature 18° to 20 °C (64° to 70 °F)
Nozzle Cap Nut Torque 34 3 N m (25 2 lb ft) Introduction
Perform the following procedures in order to determine if a fuel injection nozzle does not work correctly. Required Tools
Table 2
Required Tools
Part Number Part Description Qty
5P-4150 Nozzle Testing Group 1
5P-4718 Adapter 1
6V-2170 Tube Assembly 1
8S-2270 Fuel Collector 1
1U-8857 Extension 1
6V-6068 SAE J-967 Calibration Fluid 1 Test Procedure
Bench test the fuel injection nozzles at a temperature of 18° to 20 °C (64° to 70 °F)Test the Fuel Injection Nozzles
Bench test the fuel injection nozzles at a temperature of 18° to 20 °C (64° to 70 °F)
Illustration 1 g01141683
Fuel injection nozzles and lines
(1) Nut for the fuel supply line
Run the engine at low idle.
Loosen the nut for the fuel supply line (1) at the fuel injection nozzle on cylinder number 1. Do not loosen the nut more than half of a turn. Listen for the low idle to decrease or become rough. Tighten the nut for the fuel supply line on cylinder number 1. Perform this test on each cylinder.
The fuel injection nozzle is faulty when the nut for the fuel supply line is loosened and the following events occur:
The engine rpm does not decrease.
The engine does not idle roughly.
Remove the faulty fuel injection nozzle for additional testing. Note: If leakage occurs at the nut for the fuel supply line, make sure that fuel supply line and the nut 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 the 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 in the orifices of the nozzle tip can damage engine components. Dirt can also distort the spray pattern of the nozzle. Test the Spray Pattern
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