4-21.PRESSURE RELIEF VALVE AND TUBING REPLACEMENT.
This task covers:
Equipment Conditions - continued
General Mechanics Tool Kit (Appendix B, Section
Defrost door and shroud removed. Refer to para 4-13.
III. Item 1)
General Safety Instructions
Thread Sealant (Appendix F. Section II, Item 2)
· Do not smoke within 100 feet of filter-separator.
Filter-separator remove from system, tank drained
· Fuel is toxic to skin, eyes, and respiratory tract.
and water drain valve open. Refer to para 2-6.
· Sealant is toxic to skin, eyes, and respiratory tract.
Air vent valve open. Refer to para 2-6.
Refer to figure 4-11.
Fuel is toxic to skin, eyes and respiratory tract Wear skin and eye protection when handling
components. Provide adequate ventilation.
Pressure relief valve is preset at 150 psig and sealed by the manufacturer. If seal is broken
notify unit maintenance.
Remove tube assembly (1) from pressure relief valve (2) b
y unscrewing nut (3) while holding adapter (4)
with wrench to keep it from turning.
Remove adapter (4) from pressure relief valve (2).
Unscrew pressure relief valve (2) from outlet port (5) on tank.
Do not apply excessive pressure with fingers when cleaning or applying sealant onto threads.
Sharp threaded edges could cause injury.
Apply sealant to pipe threads on pressure relief valve (2) and install pressure relief valve in outlet port
(5) on tank.
Apply sealant to threads on adapter (4) and install in pressure relief valve (2) outlet port.
Position sleeve on tube assembly (1) against adapter (4) and tighten nut(3) to secure tube assembly on