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POWER PLANT - TROUBLE SHOOTING
______________________________ (VISUAL CHECKS)
_______________
 1.  General_______
 A.  Trouble shooting visual checks are provided to illustrate and provide details for simple checks required during trouble shooting.
 B.  Visual Checks are defined as checks which require only visual observation to complete. Although opening of fan cowl panels or fan duct cowl and thrust reverser halves may be required, no special check/test equipment is used; no components are removed; and no engine operation is required.
 2.  Visual Checks Listing_____________________
 Visual Check____________  Figure Location
 Engine Fuel System Leak Check Fig. 101
 Engine Oil System Plumbing and Leak Check Fig. 102
 MEC Specific Gravity Setting Check Fig. 103
 CIT Sensor Tubing Check Fig. 104
 T2 Temperature Sensor Check Fig. 105
 T12 Temperature Sensor Check Fig. 106
 Engine Pneumatic Duct Check Fig. 107
 Engine Inlet Check Fig. 108
 Fan Blade Check Fig. 109
 1st-Stage Stator Vane Check Fig. 110
 Abradable Shroud Check Fig. 111
 Scavenge Oil Filter Clogging Indicator Check Fig. 112
 Engine Oil System Drain Check Fig. 113
 Oil Indicating System Plumbing Check Fig. 114
 Flame Arrestor Check Fig. 115
 Constant Speed Drive (CSD) Oil Cooler Check Fig. 116

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 71-00-58
 ALL  ú ú C01 Page 101 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL NOZZLE
FWD
SEE A  (20 PLACES)
SEE B FUEL SUPPLY AND MANIFOLD SHROUD DRAIN
LEFT VSV
ACTUATOR
SEAL AND
SHROUD DRAIN

VBV FUEL GEAR MOTOR SEAL DRAIN
FWD
CHECK ENGINE FUEL SYSTEM FOR LEAKS FUEL SUPPLY SHROUD DRAIN MANIFOLD
FUEL MANIFOLD
NOTE:  ENGINE BUILDUP EQUIPMENT NOT SHOWN FOR CLARITY.
A
HPT CLEARANCE CONTROL VALVE DRAIN AND RIGHT VSV ACTUATOR SEAL AND SHROUD DRAIN
CIT SENSOR SHROUD DRAIN
FUEL PUMP PAD DRAIN
MEC SHAFT DRAIN
MAIN OIL/FUEL 
MEC CASING  HEAT EXCHANGER 
DRAIN  DRAIN 

Fuel Drain Lines
B

1.  
OPEN FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).

2.  
CHECK FOR EVIDENCE OF FUEL LEAKAGE FROM FUEL MANIFOLD AND FUEL DRAIN MANIFOLD ON ENGINE CORE.

3.  
CHECK FOR EVIDENCE OF INTERNAL FUEL LEAKS, INDICATED AS FUEL DRIPPING FROM FUEL DRAIN LINES (REFER TO 71-71-00 I/C FOR ALLOWABLE LEAKAGE AND CORRECTIVE ACTION).

4.  
CLOSE FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).

Engine Fuel System Leak Check
Figure 101

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 71-00-58
 ALL  ú ú C01 Page 102 ú Feb 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
2
1
A
ENGINE OIL SYSTEM PLUMBING AND LEAK CHECK
SEE A
3
SEE B
SEE C
4
1.
OPEN FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).

2.
EXAMINE THE FOLLOWING FOR DAMAGE AND/OR LEAKS:

A. MAIN OIL/FUEL HEAT EXCHANGER (1)
B. SERVO FUEL HEATER (2)
C. "OIL IN" TUBE (3) FROM SCAVENGE OIL FILTER (13) TO SERVO FUEL HEATER (2)
D. "OIL OUT" TUBE (4) FROM SERVO FUEL HEATER (2) TO OIL TANK (14)
E. SCAVENGE OIL FILTER (13)
F. OIL SUPPLY FILTER (9)
G. MAGNETIC CHIP DETECTORS (8)
H. LUBRICATION UNIT (7)
I. FORWARD SUMP OIL SUPPLY TUBE (5) FROM LUBRICATION UNIT (7) TO FORWARD SUMP AND TGB
J. AFT SUMP OIL SUPPLY TUBE (6) FROM LUBRICATION UNIT (7) TO AFT SUMP VIA 6 O'CLOCK STRUT
K. AGB OIL SUPPLY TUBE (11) FROM LUBRICATION UNIT (7) TO AGB
L. SCAVENGE OIL FILTER INLET TUBE (10) FROM LUBRICATION UNIT (7) TO SCAVENGE OIL FILTER (13)
M. TGB SCAVENGE TUBE (12) FROM TGB TO AGB
　
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