TASK 79-34-02-404-006-C00
 3.  Oil Temperature Indicator Installation
______________________________________
 A.  References
 (1)  AMM 79-34-00/501, Oil Temperature Indicating System
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 79-34-02
 INDICATORS  ú
 ú C01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 401Mar 12/01 

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B. Access
 (1)  Location Zone
 101 Control Cabin

 C. Procedure
 S 434-013-C00
 CAUTION: MAKE SURE YOU CONNECT THE CORRECT ELECTRICAL CONNECTOR TO THE
_______ OIL TEMPERATURE INDICATORS. FAILURE TO DO SO CAN RESULT IN A CROSS CONNECTION OF THE CIRCUIT.
 (1) Connect the electrical connector to the oil temperature indicator.
 NOTE: The D604 connector supplies signal to the engine No. 1
____ indicator. The D606 connector supplies signal to the engine No. 2 indicator.
 S 424-008-C00
 (2)  
Put the indicator in the opening in the pilot 's center instrument panel (P2).

 S 434-009-C00

 (3)  
Tighten the clamp adjustment screw for the indicator.

 NOTE: The adjustment screw is the larger screw located above and to
____
 the right of the indicator.

 S 864-010-C00
 (4)  Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  P6 Load Control Center
 1) ENG 1 OIL TEMP & PRESS AC
 2) ENG 2 OIL TEMP & PRESS AC

 S 714-011-C00
 (5)  Do the operational test of the oil temperature indicating system (AMM 79-34-00/501).
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 79-34-02
 INDICATORS  ú
 ú C01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 402Mar 12/01 

////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL FILTER BYPASS WARNING SYSTEM -
__________________________________ DESCRIPTION AND OPERATION
_________________________
 1.  General_______
 A.  The oil filter bypass warning system provides an indication in the flight compartment of a clogged scavenge oil filter element and an impending filter bypass. The system consists of an oil filter differential pressure switch and an oil filter bypass warning light for each engine.
 2.  Oil Filter Differential Pressure Switch (Fig. 1)_______________________________________
 A.  The oil filter differential pressure switch is a snap-action pressure sensitive switch. The high pressure side of the switch is connected to the oil inlet side of the scavenge filter housing. The low pressure side is connected to the scavenge filter outlet tube. The oil filter differential pressure switch is attached to a bracket mounted on the lubrication unit.
 3.  Oil Filter Bypass Warning Light (Fig. 1)_______________________________
 A.  Two amber oil filter bypass warning lights, one for each engine, are located on the pilot's center instrument panel, P2. Lights illuminate to indicate oil scavenge filter bypass.
 4.  Operation (Fig. 1 and 2)_________
 A.  28 volts dc power is supplied to the oil filter bypass warning system from the P6-3 breaker panel.
 B.  As the scavenge filter becomes clogged, the pressure differential across the switch increases.
 C.  When it gets to 25 to 27 psig, the switch closes to complete the warning light circuit and the warning light for the oil filter bypass comes on.
 NOTE: During the first start of the day or during cold weather starts,
____ the oil pressure can go above the normal range and the oil filter bypass light can come on. Operate the engine at idle power; the filter bypass light should go off as the oil warms and the pressure returns to normal.
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