TM 9-4310-397-14
6-3. FUEL INJECTION NOZZLE REPAIR AND REPLACEMENT. - Continued
(b)
Check for valve bottoming by raising pressure to 200-500 psi (1380-3450 kPa) (14-34 bar) above nozzle
opening pressure. Although some fuel may collect at nozzle tip, a rapid dribble should not occur.
(c)
Remove nozzle from tester and install in holding fixture.
(d)
Carefully turn lift adjusting screw out 1/2 turn counterclockwise. A tolerance of 1/8 turn is permissible.
(e)
Hold pressure adjusting screw stationary while tightening lock nut. Use No. 18958 Torque Wrench Adapter
from (item 9, section III, appendix B) on English-type lock nuts; No. 24374 from (item 9, section III,
appendix B) on metric-type lock nuts.
(f)
Torque pressure adjusting screw lock nut (2) to 3. 5 ft-lb (5 Nm).
(g)
Recheck nozzle opening pressure.
(h)
If nozzle chatter is incorrect after servicing, valve parts may be misaligned. To correct, screw pressure
adjusting screw (Figure 6-9, 4) through its range of adjustment several times and reset valve lift. Recheck
nozzle for chatter.
(i)
Clean nozzle with No. 16488 Brass Wire Brush (item 9, section III, appendix B).
e.
Installation.
NOTE
Upper seal washer, carbon stop seal and spacer are provided in sets of three each with
injection nozzle repair kit.
(1) Slide a new upper seal washer (1) on to nozzle body from nozzle repair kit (item 46, appendix H).
(2) Each time an injection nozzle is removed from the cylinder head, replace carbon stop seal (2) with a new one.
Figure 6-12. Injection Nozzle Installation
6-12
