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EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-020
ENGINE OIL - DISTRIBUTION - COMPONENT LOCATIONS
ENGINE OIL - DISTRIBUTION - COMPONENT LOCATIONS
EFFECTIVITY
GUN 201-999 79-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-020
THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE OIL - DISTRIBUTION - COMPONENT LOCATIONS
79-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The lubrication unit supplies pressurized oil to lubricate the
engine bearings and gears. It also takes the oil that collects in
the sumps and the gearboxes and sends it back to the oil tank.
Location
The lubrication unit is on the rear face of the accessory gearbox
at the 6:00 position. You open the left fan cowl to get access to
the lubrication unit.
Physical description
The lubrication unit contains these parts:
* Oil supply pump (not shown)
* Supply oil filter
* Supply oil filter bypass valve
* Pop-out indicator
* Pressure relief valve
* Oil scavenge pump (3) (not shown)
GUN 001-099, 101-115
* Chip detector (3).
GUN 201-999
* Debris monitoring system (DMS) detector (3).
GUN ALL
A V-band clamp attaches the lubrication unit to the accessory
gearbox.
Functional Description
The accessory gearbox turns the oil supply pump and the three
scavenge pumps in the lubrication unit. The pumps are on a
common shaft.
The oil supply pump does not control the output pressure. When
the engine speed changes, the oil pressure changes.
Training Information Point
When you remove the lubrication unit from the accessory
gearbox, be careful to avoid damage to the hollow drive shaft
and splines. The hollow drive shaft will separate from the
lubrication unit when it is removed from the accessory gearbox.
ENGINE OIL - DISTRIBUTION - LUBRICATION UNIT
EFFECTIVITY
GUN ALL 79-20-00
Page 10
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-030
ENGINE OIL - DISTRIBUTION - LUBRICATION UNIT
ENGINE OIL - DISTRIBUTION - LUBRICATION UNIT
EFFECTIVITY
GUN 001-099, 101-115 79-20-00
Page 11
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-030
ENGINE OIL - DISTRIBUTION - LUBRICATION UNIT
ENGINE OIL - DISTRIBUTION - LUBRICATION UNIT
EFFECTIVITY
GUN 201-999 79-20-00
Page 12
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-030
THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE OIL - DISTRIBUTION - LUBRICATION UNIT
79-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The supply oil filter removes and holds unwanted material from
the supply oil. The supply oil filter prevents the contamination of
the downstream oil circuit.
Location
The supply oil filter is in the lubrication unit. The lubrication unit
is on the rear face of the accessory gearbox at the 6:00 position.
You open the left fan cowl to get access to the supply oil filter.
Physical Description
The supply oil filter is a paper filter cartridge. You discard the
filter after use.
The lubrication unit housing holds the supply oil filter. The cover
keeps the supply oil filter in the housing. The oil filter housing
cover has a drain plug.
Training Information Point
When the filter clogs, the supply oil filter bypass valve opens.
The bypass valve is in the lubrication unit housing. The pop-out
indicator comes out before the bypass valve opens. You see a
red button in the sight glass dome when the pop-out indicator
comes out. This tells you there is a clogged condition and to
change the filter. This can prevent contamination of the
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