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5) Install woodruff key (8).
6) Install pulley (3).
7) Secure the assembly with a new lockwasher (1) and nut (2).
8) Immobilize pulley (3).
9) Torque - refer to 20-00-01.
10) Install alternator (5) - refer to Paragraph 2.
1 - Pulley
2 - Noise filter
3 - Bolt
4 - Washer (if installed)
5 - Washer
6 - Nut
7 - Cotter pin
8 - Pulley
9 - Alternator
10 - Belt
11 - Bolt
12 - Washer
13 - Support
Alternator - Removal / Installation
Figure 401
1 - Lockwasher
2 - Nut
3 - Pulley
4 - Spacer
5 - Alternator
6 - Fan
7 - Plate
8 - Woodruff key
Alternator - Disassembly / Assembly
Figure 402
PAGE INTENTIONALLY LEFT BLANK
ALTERNATOR
ADJUSTMENT/TEST
1. ADJUSTMENT OF THE BELT TENSION (Figure 501)
A. Tools and consumable materials
- Torque wrench 0 to 180 lbf.in (0 to 20 N.m)
- Socket, dia. 15/16"
- Stainless steel lockwire dia. 0.032 in (0.8 mm)
B. Procedure
CAUTION : AN INCORRECT ADJUSTMENT OF THE ALTERNATOR BELT TENSION MAY GENERATE THE DAMAGE OF THE DRIVE SHAFT BEARING AND MAY CAUSE THE ALTERNATOR DAMAGE.
1) Make sure that the main switch-breaker is open.
2) Install the warning sign prohibiting main switch-breaker operation.
WARNING
DO NOT OPERATE
MAINTENANCE WORK IN PROGRESS
WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE KEY IS REMOVED FROM MAGNETO SELECTOR AND THAT "MAIN SWITCH" IS OFF.
IF AIRCRAFT IS EQUIPPED WITH DISCONNECT PLUG ON FIREWALL, DISCONNECT "MAGNETO DISCONNECT" PLUG AND CONNECT IT TO "GROUND MAGNETO FOR SERVICING" PLUG.
WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE ENGINE, EXHAUST PIPE AND MANIFOLDS ARE COLD. IF NOT, TAKE NECESSARY PRECAUTIONS TO AVOID SEVERE BURNS.
3) Remove the engine cowlings - refer to 71-10-01.
4) Position a torque wrench fitted with a socket, dia. 15/16", on nut (2) securing alternator pulley.
5) Hold propeller firmly and turn torque wrench clockwise ; record the value when the pulley slides.
6) Adjustment is correct if the value lies within :
- 11 and 13 ft.lbs (14.9 and 17.6 N.m) for a new belt.
- 7 and 9 ft.lbs (9.5 and 12.2 N.m) for an in-service belt.
7) If adjustment is not correct, perform the following operations :
a) Cut off the lockwire and and loosen bolt (4).
b) Pivot alternator (3) to tension belt (1), then tighten bolt (4).
c) Perform two or three propeller rotations to evenly distribute the stresses.
d) Repeat steps 4), 5) and 7) until you obtain the recommended value.
e) Lockwire bolt (4).
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