This is an interesting topic. I did not realize that there was a 'clutch' on the new alternators. After reading your reply, I decided to review the FSM to learn more about how they work:
Excerpts from the '04 FSM:
Quote:
GENERATOR DECOUPLER PULLEY
DESCRIPTION
The Generator Decoupler is a one way clutch (Fig.
3). It is attached to the generator and replaces the
standard pulley. It is a non-serviceable item and is to
be replaced as an assembly. It is a dry operation (no
grease or lubricants). The operation of it is not temperature
sensitive and has a low sensitivity to electrical
load.
OPERATION
The generator decoupler is a one way clutch and
should be replaced as an assembly. It is designed to
help reduce belt tension fluctuation, reduce fatigue
loads, improve belt life, reduce hubloads on components,
and reduce noise.
|
It is ironic and unfortunate that an item meant to
reduce noise, is creating an unwanted noise for you.
Your problem is listed in the troubleshooting section, for which you have already properly identified:
Quote:
CONDITION
Noise from generator at engine shut down.
VERIFICATION PROCEDURE
1. Start engine and allow engine to idle.
2. Shutdown engine and listen to generator.
3. Noise heard just as engine stops. Sounds like a click.
4. Remove accessory drive belt.
5. Verify rotation in counterclock wise direction is rough.
POSSIBLE CAUSES
Defective decoupler pulley bearing.
CORRECTION
Replace decoupler pulley.
|
The decoupler pulley needs to be torqued to 81 ft-lb.
Thanks for letting us know how you solved this squeel.
