Orifice Restriction Test

FUEL INJECTION LINES - TM-5-3805-263-14P-2_52

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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FUEL SYSTEM 5. If the nozzle is no! within specifications, DO NOT USE THE NOZZLE. IV. Orifice Restriction Test 1. 2. Close gauge protector valve (E) and on-off valve (H). Open pump isolator valve (K). Point the tip of the fuel injection nozzle into the 8S2270 Fuel Collector and FT1384 Extension. Be sure the bleed screw hole is positioned toward the tester and is in line with 6V2170 Tube As- sembly (C). This will make the fuel injection nozzle be 15° from vertical and the spray pat- tern will be horizontal. 3. Make a slow increase in pressure and look at the orifice discharge pattern (shape of discharge) when fluid begins to flow through the fuel injec- tion nozzle. The discharge must be the same through all nine orifices. Any change either ver- tically or horizontally. is an indication of a bad nozzle. TESTING AND ADJUSTING TM 5-3805-263-14&P-2 V. Bleed Screw Leakage Teat 1. Install bleed screw and seal (4) in fuel injection nozzle. Tighten the bleed screw to a torque of 0.9 ± 0.1 N•m (8 ± 1 lb. in.) CAUTION Do not tighten the bleed screw more than the torque shown. The bleed screw or seal can be damaged. 2. 3. 4. Put the tip of the fuel injection nozzle down inside the 8S2270 Fuel Collector and FT1384 Extension. Close on-off valve (H). Open gauge protector valve (E) and pump isolator valve (K). Pump the tester until fuel injection nozzle is full of fluid and the pressure on the gauge is 27 500 kPa (4000 psi). NOTE: 15 or 20 strokes of the pump can be neces- sary for the pressure to get to 27 500 kPa (4000 psi). BLEED SCREW LEAKAGE SPECIFICATION There must be no leakage between the bleed screw and the body of the fuel injection nozzle. 5. 6. If there is leakage, replace the 8N4174 Seal. Inspect the washer face of the bolt for damage, replace if needed. Test the nozzle again. If there is still leakage, the fuel injection nozzle must be replaced. If no fuel leakage is found, the fuel injection nozzle is acceptable. Put a new seal (3) on the nozzle. Install a new carbon dam (2) in nozzle groove with SS2252 Carbon Seal Tool (N). NOTE: The 8S2252 Carbon Seal Tool must be mo- dified before it can be used with the 8N7005 Fuel Injection Nozzle. Special Instruction Form No. SEHS7292 has the information needed to modify the tool. 1-41

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