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 2.  Variable Stator Vane Actuator (Fig. 2)
_____________________________
 A.  Two VSV actuators are mounted on the HPC forward stator case at the 1:30 and 7:30 o'clock positions. Each VSV actuator is connected through a clevis link and the stage 3 bellcrank to a master rod which unites the bellcranks to mechanically position the actuation rings which control VSV angular positions.
 B.  The VSV actuators are single-ended, uncushioned hydraulic cylinders, which are driven in either direction by high pressure fuel (PF). The actuator rod end is sealed against fuel leakage by dual-stage preformed seals. Fuel, which could leak past the preformed seals, is drained overboard through the starter air discharge duct fitting. The piston incorporates a capped preformed packing to prevent leakage across the piston and controls stroke by internal stops. The piston rod is ensured of dirt-free operation by means of a wiper which cleans the rod as it retracts past the dual-stage seals. The rod end is threaded and fitted with an adjustable extension that includes a clevis for connection to the VSV bellcrank assembly.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
RIGHT VSV
ACTUATOR

SEE C
SEE A
LEFT VSV
ACTUATOR
SEE B CONTROL
MAIN ENGINE
VSV FEEDBACK CABLE
G-M56-MM-0140(1)-01-B
A
ADJUSTABLELINK STAGE 2
STAGE 1 ADJUSTABLEBELLCRANKBELLCRANK LINK
ROD END ADJUSTABLE
HEAD END
LINK STAGE 3
BELLCRANK
VSV DRAIN  VSV
IGV ACTUATOR
BELLCRANK CLEVIS LINK
IGV 
CLEVIS LINK  BELLCRANK 
VSV  MASTER  STAGE 3 
ACTUATOR  ROD  BELLCRANK 
HEAD END  ADJUSTABLE 
ADJUSTABLE  LINK 
LINK 
ROD END  STAGE 1 
FEEDBACK CABLE  STAGE 2  BELLCRANK 
FWD  VSV DRAIN  BELLCRANK MASTER  ADJUSTABLE  FWD 
ROD  LINK 
LEFT VSV ACTUATOR  RIGHT VSV ACTUATOR 
B  C 

Variable Stator Vane (VSV) Actuation System Component Location
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
C.  ON ENGINES WITH CFMI SB 75-023; a new VSV Actuator is introduced with a thinner piston rod diameter and a new end cap for the CFM56-3C-1 engine.
 (1)  
The introduction of the new VSV Actuator is completely
 interchangeable with the old VSV Actuator.

 (2)  
The new VSV Actuators must be replaced on the engine in pairs to maintain the balanced forces in the VSV system.

 (3)  
Do not install an old VSV actuator with a new VSV actuator.

 3.  Variable Stator Vane Bellcrank Assembly (Fig. 1 and 3)_______________________________________
 A.  Each VSV bellcrank assembly consists of four bellcranks (IGV, stage 1, stage 2 and stage 3) which are mechanically driven by the VSV actuator through connections to the master rod. Adjustable links, consisting of a tie rod and bearing, connect each bellcrank to the actuation rings.

PISTON
LEFT VSV ACTUATOR) G-M56-MM-0056(1)-03-B
Variable Stator Vane (VSV) Actuator Cross Section Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
　
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