TM 55-2840-231-23
CHAPTER 8
OIL SYSTEM
This chapter contains procedures for the maintenance and preservation of the oil system. Paragraphs
following outline disassembly, inspection, repair and additional requirements needed to maintain the oil
system and related parts. Procedures requiring maintenance on the Aviation Intermediate Maintenance
(AVIM) level are specified and must be performed as such. Paragraphs in which the maintenance level is
not specified shall be considered Aviation Unit Maintenance (AVUM) and may be performed at this level
or a higher level of maintenance.
Oil System Maintenance Procedures
Oil Filter Housing - Removal and Installation
Oil Filter - Removal
Oil Filter - Cleaning
Oil Filter - Installation
Oil Pressure Regulator - Removal, Installation, Inspection, Testing and
Adjustment
Internal Oil Check Valve - Removal and Installation
External Oil Check Valve - Removal, Cleaning, Inspection and Installation
Oil Pressure Reducer - Removal and Installation
Oil Tubing and Fittings - Inspection and Replacement
8-1
8-2
8-4
8-5
8-6
8-7
8-10
8-11
8-14
8-15
8-1. OIL SYSTEM MAINTENANCE PROCEDURES.
Visually inspect all subassemblies and accessories removed from the engine’s oil system. Check for
loose or missing parts. Note any damage or excessive wear. Repair damaged parts where possible.
Replace damaged parts that cannot be repaired. Disassembly procedures provided enable required
cleaning, inspection, repair or replacement.
Change 11
8 -
1
