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cowl to get access to the scavenge oil filter assembly.
Scavenge Oil Filter Assembly
The scavenge oil filter assembly has a filter bowl and a body.
The filter bowl holds the scavenge oil filter cartridge. A locking
ratchet lever prevents rotation in the direction to loosen the
filter bowl. In the body, an oil filter bypass valve opens when
debris causes the scavenge oil filter to clog. The body also
holds the scavenge oil filter clogging transmitter.
See the oil indicating section for more information on the
scavenge oil filter clogging transmitter. (SECTION 79-30)
Scavenge Oil Filter
The scavenge oil filter removes debris from the three scavenge
circuits. The scavenge oil filter prevents contamination of the oil
circuit from one of these components if it becomes defective:
* Main engine bearing
* Gear
* Gear bearing
* Scavenge pump.
Training Information Point
The scavenge oil filter is a paper filter cartridge. Discard the
filter after removal and inspection.
ENGINE OIL - DISTRIBUTION - OIL SCAVENGE FILTER ASSEMBLY
EFFECTIVITY
GUN ALL 79-20-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-070
ENGINE OIL - DISTRIBUTION - OIL SCAVENGE FILTER ASSEMBLY
ENGINE OIL - DISTRIBUTION - OIL SCAVENGE FILTER ASSEMBLY
EFFECTIVITY
GUN 001-099, 101-115 79-20-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-070
ENGINE OIL - DISTRIBUTION - OIL SCAVENGE FILTER ASSEMBLY
ENGINE OIL - DISTRIBUTION - OIL SCAVENGE FILTER ASSEMBLY
EFFECTIVITY
GUN 201-999 79-20-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-070
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79-20-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The anti-leakage valve prevents oil leakage when you
disconnect the oil tube from the anti-leakage valve to the
lubrication unit.
The oil tank is higher on the engine than the other parts of the
oil system. After engine shutdown, this may cause the oil
quantity to decrease. The anti-leakage valve prevents this.
Location
The anti-leakage valve is on the fan frame at the 6:00 position.
The anti-leakage valve is on the oil tube from the oil tank to the
lubrication unit. You open the fan cowls to get access to the antileakage
valve.
Functional Description
The anti-leakage valve is a pressure-actuated valve. When the
engine does not operate, a spring closes the valve. This
prevents oil leakage during removal of a component of the oil
distribution system. This also prevents the oil flow from the oil
tank to other oil system components.
When the engine operates, the oil pressure from the rear sump
supply line holds the valve open.
Training Information Point
You must drain the oil tank before you replace the anti-leakage
valve.
ENGINE OIL - DISTRIBUTION - ANTI-LEAKAGE VALVE
EFFECTIVITY
GUN ALL 79-20-00
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79-20-00-080
ENGINE OIL - DISTRIBUTION - ANTI-LEAKAGE VALVE
ENGINE OIL - DISTRIBUTION - ANTI-LEAKAGE VALVE
EFFECTIVITY
GUN ALL 79-20-00
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79-20-00-080
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79-20-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Supply Circuit
Oil from the oil tank goes through the anti-leakage valve to the
lubrication unit. The oil supply pump pressurizes the oil.
The pressure relief valve sends oil to the inlet of the AGB/TGB
scavenge pump when the supply pressure is too high.
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