(5)
Install the MCD's (AMM 79-21-05/201).

 S 426-032-C00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 79-00-00
 ALL  ú ú C01 Page 614 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 216-036-C00
 (6)  Do a check for clogged indicators on the oil supply filter and the scavenge oil filter. (a) If there is an indication of a clogged oil filter, do the trouble-shooting procedure for the oil filter (AMM 71-00-44/101).
 S 416-037-C00
 (7)  Close the fan cowl panels (AMM 71-11-02/201).

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 79-00-00
 ALL  ú ú C01 Page 615 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL STORAGE - DESCRIPTION AND OPERATION
_______________________________________
 1.  General_______
 A.  The engine oil tank keeps and provides a continuous supply of oil for
 distribution. It is found on the lower right side of the fan case.

 B.  The oil tank can be filled with oil at the filler cap and drained through the magnetic drain plug boss. The tank has an air/oil separator and has a mounting boss for an oil quantity transmitter.
 2.  Oil Tank (Fig. 1)________
 A.  The oil tank is a fabricated light alloy weldment envelope with a sealed
 cast light alloy cover. It has an external flame-resistant layer and
 five inner bulkheads to decrease sloshing and strengthen the tank. A
 sight glass is given on the outboard side of the tank to measure the oil
 level and a magnetic drain plug is found at the bottom of the tank.

 B.  Total volume (usable oil + residual oil + air) of the oil tank is 5.3
 U.S.
 gallons (20 liters). It has an oil capacity (usable oil + residual oil) of 4.8 U.S. gallons (18 liters) and an usable oil capacity of 4.6

 U.S.
 gallons (17 liters). Engine No. 1 oil tank has 2% less capacity and Engine No. 2 oil tank has 3% more capacity due to the wing inclination angle.

 C.  Seven operational components are included in the tank cover:
 (1)  
The filler cap with a scupper, a scupper drain and a screen.

 (2)  
Lube supply port, suction tube and screen.

 (3)  
Lube scavenge port, located adjacent to the lube supply port.

 (4)  
Air vent outlet to the forward sump.

 (5)  
Antisiphon device and tube.

 (6)  
Air/oil separator and tube.

 (7)  
Oil quantity transmitter mounting boss.

 3.  Oil Tank Filler Cap (Fig. 2)___________________
 A.  The oil tank filler cap includes: a locking plug assembly fastened to
 the filler cap body by a chain, a sampling tube, a strainer and a check
 valve incorporated in the filler cap body.

 (1)  
The locking plug assembly includes: a piston, a spring, washers, a ball and a plug. When the locking handle is lowered, the ball compresses the spring which applies a force on the seal against the body.

 (2)  
The check valve includes: a diaphragm which seals the lower filler cap body with oil tank pressure. The check valve makes sure no oil leakage occurs while the oil tank is pressurized or if the locking plug is not installed correctly.

 4.  Operation_________
 A.  Oil is drawn from the bottom of the oil tank through a suction tube
 attached to the tank cover. Return oil discharges tangentially into the
 air/oil separator where the air is spun out through the air vent to the
 forward oil sump.

 B.  The antisiphon device prevents the oil from being siphoned through the oil supply when the engine is not operating. After engine shut down, the oil pressure downstream of the supply pump falls below the oil tank internal pressure. This lets the lubrication unit to be unprimed by air in the oil tank. The oil is forced back into the oil tank through the antisiphon tube.
　
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