DIAGNOSIS AND TESTING - GENERATOR DECOUPLER
CONDITION POSSIBLE CAUSES CORRECTION
Does not drive generator
(generator not charging)
Internal failure Replace decoupler
Noise coming from
decoupler
Internal failure Replace decoupler
REMOVAL
The generator decoupler is used only with
certain engines.
Two different type generator decoupler pulleys are
used. One can be identified by the use of machined
splines (Fig. 6). The other can be identified by a hex
opening (Fig. 7) and will not use splines.
Different special tools are required to service each
different decoupler. Refer to following procedure.
INA Decoupler
(1) Disconnect negative battery cable.
(2) Remove generator and accessory drive belt.
Refer to Generator Removal.
(3) Position Special Tool #8823 (VM.1048) into
decoupler (Fig. 8).
(4) Determine if end of generator shaft is hex
shaped (Fig. 9) or is splined (Fig. 10). If hex is used,
insert a 10MM deep socket into tool #8823 (VM.1048)
(Fig. 11). If splined, insert a 5/16” 6-point hex driver,
or a 10MM 12-point triple square driver into tool
#8823 (VM.1048) (Fig. 12).
(5) The generator shaft uses conventional right-
hand threads to attach decoupler. To break decoupler
loose from generator threads, rotate end of tool clock-
wise (Fig. 11) or, (Fig. 12).
(6) After breaking loose with tool, unthread decou-
pler by hand from generator.
Fig. 6 GENERATOR DECOUPLER PULLEY (INA)
1 - GENERATOR
2 - DECOUPLER (INA)
3 - MACHINED SPLINES
Fig. 7 GENERATOR DECOUPLER PULLEY (LITENS)
1 - DECOUPLER (LITENS)
2 - HEX OPENING
8Fa - 4 CHARGING WG
GENERATOR DECOUPLER PULLEY (Continued)
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