DIAGNOSIS AND TESTING - GENERATOR DECOUPLER
CONDITION POSSIBLE CAUSES CORRECTION
Does not drive generator
(generator not charging)
Internal failure Replace decoupler
Noise coming from decou-
pler
Internal failure Replace decoupler
REMOVAL
Th e g e ner a to r d ec o up l e r i s us e d o n ly w i t h
certain engines.
Two different t ype generat or decoupler pulleys a re
used. On e can be identified by the u se of machined
splines (Fig. 3). The oth er can be iden tified by a hex
openin g (Fig. 4) and will not use splines.
Different special tools a re required to service each
differen t decoupler. Refer t o following procedure.
INA Decoupler
(1) Disconn ect nega tive battery cable.
(2) Remove gen erat or and accessory dr ive belt.
Refer to Gener ator Rem oval.
(3) Position Special Tool #8823 (VM.1048) in to
decoupler (F ig. 5).
(4) Deter mine if end of generator shaft is h ex
sh aped (Fig. 6) or is splined (Fig. 7). If h ex is used,
inser t a 10MM deep socket int o tool #8823 (VM.1048)
(Fig. 8). If splined, insert a 5/16” 6-point hex driver,
or a 10MM 12-point triple squar e driver into tool
#8823 (VM.1048) (Fig. 9).
(5) The gen erat or sha ft uses conventional right-
hand thr eads t o attach decoupler. To break decoupler
loose from generator th reads, rot ate en d of tool clock-
wise (Fig. 8) or, (Fig. 9).
(6) After br eaking loose with t ool, unthread decou-
pler by han d fr om gener ator.
Fig. 3 GENERATOR DECOUPLER PULLEY (INA)
1 - GENERATOR
2 - DECOUPLER (INA)
3 - MACHINED SPLINES
Fig. 4 GENERATOR DECOUPLER PULLEY (LITENS)
1 - DECOUPLER (LITENS)
2 - HEX OPENING
8F - 20 CHARGING SYSTEM VA
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