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3.2L: Power system service urgent and screech

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
carboncow
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carboncow

3.2L: Power system service urgent and screech

Post by carboncow » Fri Nov 03, 2017 6:06 am

Helping a friend a few hundred miles away with them. I'm a transplant from the P2 XC70 world but looking into a 3.2L myself, so interested.

She has a 2007 3.2 with 100K miles FWD.

This am 50F and raining she said it lit up with "power system service urgent" message and got a terrible screech sound but went away over 40mph and she said she got to work just fine.

Belt/tensioner?
alternator?
Something else?
Shawn F.

2001 V70 T5
2003 XC70
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2004 Chevy Suburban LT 5.3L
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jimmy57
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Re: 3.2L: Power system service urgent and screech

Post by jimmy57 » Fri Nov 03, 2017 8:27 pm

Loose alt drive cog for the alternator cuff. The alternator driven cog has a one way clutch and it is likely seized or slip then catching and has stressed and loosened the drive cog. The drive cog is a faint interference fit onto a faintly tapered stubby shaft.

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