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Location
The lubrication unit housing holds the DMS detectors. They are
at the inlet of the scavenge pumps. The lubrication unit is on the
rear of the accessory gearbox at the 6:00 position. You open the
DMS detectors/pressure relief door to get access to the
detectors.
See the engine cowling section for more information on the
DMS detectors/pressure relief door. (SECTION 71-11)
Physical Description
Each DMS detector has two magnets on a common post with a
space between them. Each detector also has a metallic-mesh
screen. Each detector attaches to the lubrication unit housing
through a bayonet lock. There is an electrical connector on each
detector. A check-valve in the lubrication unit housing prevents
an oil leak when you remove a detector.
Functional Description
The two magnets on each detector collect ferrous material. The
magnets are part of an electrical circuit that connects with the
DMS box. The two magnets complete the circuit when they
collect a sufficient amount of ferrous material to fill the space
between them. With the circuit complete, a DMS message
shows on the engine maintenance pages of the CDUs.
See the engine indicating section for more information on the
DMS messages that show on the CDUs. (SECTION 77-00)
Training Information Point
You can remove and visually inspect the magnets and screen
on each DMS detector. The name of the scavenge line on the
lubrication unit body, near each detector, identifies the area for
each detector. This lets you find the area that has the failure.
The three detectors are interchangeable. There is no mark to
identify a detector for each scavenge circuit.
ENGINE OIL - DISTRIBUTION - DEBRIS MONITORING SYSTEM
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
79-20-00-051
ENGINE OIL - DISTRIBUTION - DEBRIS MONITORING SYSTEM
ENGINE OIL - DISTRIBUTION - DEBRIS MONITORING SYSTEM
EFFECTIVITY
GUN 201-999 79-20-00
Page 21
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
79-20-00-051
Purpose
The main oil/fuel heat exchanger uses fuel from the low
pressure fuel pump to decrease the temperature of the
scavenge oil.
See the fuel distribution system section for more information on
the fuel system. (SECTION 73-11)
Location
The main oil/fuel heat exchanger attaches to the fuel pump
assembly. The fuel pump assembly is at the 8:00 position. You
open the left fan cowl to get access to the main oil/fuel heat
exchanger.
Physical Description
The main oil/fuel heat exchanger has these parts:
* Exchanger core (inside the housing)
* Housing
* Cover.
The exchanger core is where the oil temperature decreases as
the oil heats the fuel. The cover holds the exchanger core in the
housing.
The main oil/fuel heat exchanger has an oil bypass valve. The
oil bypass valve opens when the exchanger core is clogged.
This permits the oil to flow around the core exchanger. Thus,
the oil temperature increases when the oil bypass valve opens.
But the oil continues to flow.
Training Information Point
You replace the main oil/fuel heat exchanger as an assembly.
When the main oil/fuel heat exchanger has a leak, the fuel goes
into the oil circuit. This occurs because the fuel pressure is
higher than the oil pressure. If you smell fuel in the oil tank or if
the oil quantity increases, refer to the AMM for more
information.
ENGINE OIL - DISTRIBUTION - MAIN OIL/FUEL HEAT EXCHANGER
EFFECTIVITY
GUN ALL 79-20-00
Page 22
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
79-20-00-060
ENGINE OIL - DISTRIBUTION - MAIN OIL/FUEL HEAT EXCHANGER
ENGINE OIL - DISTRIBUTION - MAIN OIL/FUEL HEAT EXCHANGER
EFFECTIVITY
GUN ALL 79-20-00
Page 23
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
79-20-00-060
Purpose
The scavenge oil filter assembly contains the scavenge oil filter
and the scavenge oil filter clogging transmitter.
Location
The scavenge oil filter assembly is on the rear face of the
accessory gearbox at the 7:00 position. You open the left fan
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