Flush the Nozzle

FUEL SYSTEM

Orifice Restriction Test

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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TM 5-3805-243-14&P-2 When fuel injection nozzles are tested, be sure to wear eye protection. Fuel comes from the orifices in the nozzle tip with high pressure. The fuel can pierce (go thru) the skin and cause serious injury to the operator. Keep the tip of the nozzle pointed away from the operator and into the 8S2270 fuel Collector and FT1384 Extension. CAUTION Put a shop towel around the upper part of the nozzle to take in any fuel leakage. 3. Close on-off valve (H). Open pump isolator valve (K). 4. Open gauge protector valve (E). Operate the pump to make a slow increase in pressure until the valve in the fuel injection nozzle just starts to open. Read the maximum gauge pressure at the instant fluid flows from the tip. NOTE: It is possible for the pressure reading of the gauge to go down fast if the valve makes a noise (chatters) when it opens. It is also possible for the pressure reading of the gauge to be almost constant when the valve in the fuel injection nozzle opens. NOTE: The valve in the fuel injection nozzle can be good and still not make a noise (chatter), or not have a very fine vapor (spray) from the orifices in the tip of the fuel injection nozzle during Step 4. If the opening pressure is not within specifications, do not use the fuel injection nozzle again. II. Flush the Nozzle I. Close gauge protector valve (E). Close on-off valve (H). Open pump isolator valve (G). NOTE: Make sure nozzle extends inside and below the top of FT1384 Extension (F). 2. Operate the pump rapidly for three full strokes. Ill. Tip Leakage Test 1. Remove all fuel from the nozzle tip and body with a clean cloth. 2. Put a clean cloth around the body of the nozzle to take in any leakage from the bleed screw hole and prevent any fuel leakage to drain down to the tip of the nozzle. 3. Open gauge protector valve (E). Close on-off valve (H). Open pump isolator valve (K). 4. Make and hold for 15 seconds a pressure of 1380 kPa (200 psi) less than the opening pressure measured in VOP Test I and make a note of the number of drops that fall. 1-40

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