NOTE: There can be a leak of a small quantity of oil
____ (1.5-3.5 fl oz (50-100 cc)) when you remove the N1 speed sensor.
 1) Remove and discard the O-ring from the guide tube.
 (d) Install a protective cap on the electrical connector.
 TASK 77-12-01-102-024-C00
 3. N1 Speed Sensor Cleaning
________________________
 A. Equipment
 (1)  G00371, Brush, Soft Bristle
 B. Consumable Materials
 (1)  B00113, Solvent, (CP2011) Stoddard - P-D-680
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SEE A
CLEARANCE BEFORE YOU 
TIGHTEN THE BOLTS 
0.118-0.236 INCH 
(3.0-6.0 mm) 
N1 SPEED 
FAN FRAME  BOLT  SENSOR 
GUIDE TUBE 

O-RING MOUNTING BOLT
SLEEVE
A
S-M56-MM-01044-01-B
N1 Speed Sensor Installation Figure 201
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
C.  Procedure
 S 112-021-C00
 WARNING: CLEAN THE SENSOR IN AN APPROVED CLEANING CABINET OR IN AN
_______ AREA THAT HAS A GOOD FLOW OF AIR. DO NOT BREATHE THE VAPORS. DO NOT USE THE SOLVENT NEAR FLAMES OR HEAT. DO NOT TOUCH THE SOLVENT FOR A LONG TIME, OR YOU CAN REMOVE SKIN OILS AND CAUSE DERMATITIS.
 (1)  Clean the pin contacts on the electrical receptacle of the N1 speed sensor with a soft brush and solvent.
 TASK 77-12-01-202-025-C00
 4.  N1 Speed Sensor Visual Check____________________________
 A.  Procedure
 S 212-007-C00
 (1)  Do a visual check of the metal areas on the N1 speed sensor for this type of damage:
 (a)  
Cracks
 1) No cracks are permitted.

 (b)  
Nicks, dents or scratches with a depth of more than 0.030 inch

 (0.76 mm).
 1)  Replace the N1 speed sensor if the damage is not in the limits.
 (c) Mount flange that is not flat by more than 0.04 inch (1 mm).
 1)  Replace the N1 speed sensor if the damage is not in the limits.
 S 212-009-C00
 (2)  Do a visual check of the electrical connector on the N1 speed sensor for this type of damage:
 (a)  
More than full thread damage on 30% of one entrance thread or 20% of two entrance threads or crossed threads 1) Chase the threads if the damage is in the limits. 2) Replace the N1 speed sensor if the damage is not in the

 limits.

 (b)  
Pins that do not engage freely with the connector 1) Make the bent pins straight. 2) Replace the N1 speed sensor if the pins are broken, have

 erosion or do not engage easily.

 (c)  
Dirt in the connector
 1) Clean the N1 speed sensor.

 TASK 77-12-01-402-026-C00
 5.  N1 Speed Sensor Installation____________________________
 A.  Consumable Materials
 (1)  
G02353, Lubricant, (CP2854) petrolatum - VV-P-236

 (2)  
D00601, Grease, (CP2101) graphite - GP460, Aeroshell 8

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(3)  
A00448, Tape, Adhesive

 (4)  
G00034, Cheesecloth-new, clean, dry, lint free
　
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