TM 5-3805-280-24-2
Fuel System
35
7. Remove nozzle from tester and secure in holding
78
fixture. While holding pressure adjusting screw, tighten
pressure adjusting screw lock nut to specifications
using the ROS18958 (English size) or No. 24374
(metric size) Torque Wrench Adapter.
Injection Nozzle Pressure Adjusting Screw Locknut--Specification
Torque ............................................................................... 10 Nm (7 lb-ft)
RG,35,JW7631
1921NOV975/7
ADJUST NOZZLE VALVE LIFT
1. Reconnect nozzle to tester. While pumping fuel
through nozzle, hold pressure adjusting screw and
slowly turn lift adjusting screw in (clockwise) until valve
ceases to open.
IMPORTANT: DO NOT manually bottom the valve with
excessive force as bending of the valve
may result.
2. Check for valve bottoming by raising pressure to
1380--3450 kPa (14--34 bar) (200--500 psi) above
nozzle opening pressure.
Although some fuel may collect at nozzle tip, a rapid
dribble should not occur.
3. Remove nozzle from tester and install in holding
fixture.
4. Carefully turn lift adjusting screw out specified amount.
A tolerance of 1/8 turn is permissible.
Fuel Injection Nozzle Valve Needle Lift--Specification
Needle Lift (Based on Zero Lift)...................... 3/4 Turn Counterclockwise
Continued on next page
RG,35,JW7631
1921NOV976/7
13-457
