TM 55-2840-231-23
8-7. Internal Oil Check Valve - Removal and Installation - Continued
GEARBOX/
The internal oil check valve is located under
the oil filter housing, inside the gearbox. It
serves to prevent oil from draining out of the
oil tank and into the gearbox while the
engine is shut down.
1. Removal
Refer to paragraph 8-2.
2. Installation
Refer to paragraph 8-2.
8-8. External Oil Check Valve - Removal, Cleaning, Inspection and Installation
INITIAL SETUP
Applicable Configuration
Consumable Materials
A l
l
ENGINE/
External Oil Check Valve
1. Removal
Drycleaning Solvent (item 1, Appendix D)
The external check valve (4) is located in the
oil supply tube to the turbine. It serves to
prevent oil from draining into the turbine
bearing cavities while the engine is shut
down.
Remove self-locking nut
(5) and bolt (1) that
secure clamps (2 and 3)
together.
Configuration B only —
remove self-locking nut
(9) and bolt (6) that
secure clamps (7 and 8)
together.
Loosen the two oil tube
coupling nuts and remove
check valve (4) from the
engine.
Change 11
8-11
