Description and Operation
Oil Quantity Indicator
Oil Quantity Tank Unit
Trouble Shooting
Adjustment/Test
Oil Quantity Indicator ............................................................................................... 79-31-02 Adjustment/Test (CPSD60-1 Tester)
Oil Quantity Tank Unit.............................................................................................. 79-31-11 Removal/Installation
OIL PRESSURE INDICATING SYSTEM.................................................................... 79-32-0
Description and Operation
Oil Pressure Indicator
Oil Pressure Transmitter
Trouble Shooting
Adjusting/Test
Oil Pressure Transmitter.......................................................................................... 79-32-11 Removal/Installation Subject Subject No.
5C8
Contents 79 Page 2 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/00
LOW OIL PRESSURE WARNING SYSTEM.............................................................. 79-33-0
Description and Operation
Low Oil Pressure Indicating Light
Low Oil Pressure Switch
Trouble Shooting
Adjustment/Test
Low Oil Pressure Switch .......................................................................................... 79-33-11 Removal/Installation
OIL TEMPERATURE INDICATING SYSTEM ............................................................ 79-34-0
Description and Operation
Oil Temperature Bulb
Oil Temperature Indicator
Trouble Shooting
Adjustment/Test
Oil Temperature Indicator ........................................................................................ 79-34-11 Adjustment/Test
Oil Temperature Bulb............................................................................................... 79-34-21 Removal/Installation
OIL FILTER BYPASS WARNING SYSTEM ............................................................... 79-35-0
Description and Operation
Filter Bypass Indicating Light
Filter Bypass Switch
Trouble Shooting
Adjustment/Test
Oil Filter Bypass Switch ........................................................................................... 79-35-11 Removal/Installation
*[1] GJ ALL EXCEPT B-2509 and B-2510
5C8
Feb 20/92 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 79 Page 3
OIL - DESCRIPTION AND OPERATION
1. General
A. The engine oil system is comprised of an oil storage and an oil distribution system together with the necessary indicating systems which provide measurements of oil quantity, oil pressure, and oil temperature. A low oil pressure warning system and filter bypass warning system are also provided.
B. Each engine is provided with an independent oil system which provides cooling and lubrication of engine gears and bearings. An oil storage tank, mounted on the lower left side of the engine, furnishes a continuous supply of oil to the engine driven oil pressure pump in the accessory drive gearbox housing. An external line carries oil from the pump to a full flow type fuel/oil cooler. Cooled oil is then delivered to the engine bearings through a distribution manifold and galleries formed in the engine structure.
C. An oil filter is provided downstream of the oil pump. The filter housing is made integral with the accessory drive gearbox casing. A removable cover is located on the outside of the gearbox to allow replacement or cleaning of the filter core. A bypass valve is arranged between the inlet and outlet of the filter. If the filter becomes clogged, this valve will open and allow a flow of unfiltered oil to circulate in the engine.
D. Oil is scavenged from the engine bearing cavities by pumps and returned to the accessory drive gearbox. From there it is pumped back into the engine oil tank.
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Apr 15/66 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-00 Page 1
OIL - SERVICING
1. General
A. Servicing of the engine oil system is accomplished by either changing or replenishing the oil supply. This procedure outlines the steps required to change the engine oil supply. Refer to Chapter 12, Servicing for engine oil tank replenishment procedures.
2. Equipment and Materials
A. Engine oil conforming to PWA Specification 521B. (See PWA Service Bulletin No. 238.)
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