[cheezeit]

Originally Posted by Davisca455

I talked with my industrial bearing guy, Dale, at Motion Industries.
He contacted his counterpart on the Automotive side and they think they found the part number for the 65mm pulley that was on my A/C & PS Tensioner. It's listed as a Porsche part though, so....I'll get one, see if it fits and edit the post when it gets here.

*Edit: The 65mm "Porsche" pulley is the correct part for my car, same exact part number.

A/C & PS Tensioner Pulley (65mm OD):
Global Part #: 5320557100
https://www.fcpeuro.com/products/clo...or-95510211921

https://www.autohausaz.com/pn/IN-95510211921

Plastic Dust Cap:
https://www.fcpeuro.com/products/bmw...er-11287835996



Alternator & Water Pump Tensioner Pulley (70mm OD):
Global Part #: 5320342100
OEM:
https://www.fcpeuro.com/products/bmw...li-11281440237

OEM:
https://www.autohausaz.com/pn/11281440237

Plastic Dust Cap:
https://www.fcpeuro.com/products/bmw...er-11287835996




A/C & PS Fixed Idler/Deflection Pulley (80mm OD) Center Hole:

BMW:
https://www.fcpeuro.com/products/bmw...m3-11287841531
(FCP's website prompted me to ask if I wanted the less expensive (Vaico) option, but it turned out to be the offset version. FCP Euro has a glitch on their side, so be advised.)

BMW:
https://www.autohausaz.com/pn/BM-11287841531

Plastic Dust Cap:
https://www.fcpeuro.com/products/bmw...ap-11287535867


A/C & PS Fixed Idler/Deflection Pulley (80mm OD) Offset Hole:
Global Part #: 5320418100
BMW:
https://www.fcpeuro.com/products/bmw...ey-11287841228

BMW:
https://www.autohausaz.com/pn/11287841228

OEM:
https://www.autohausaz.com/pn/11281738605

Plastic Dust Cap:
https://www.fcpeuro.com/products/bmw...ap-11281730349

For anyone doing this in the future, you can also get the INA version of the centered (05/2008+) 80mm fixed idler pulley. It's $21 instead of $83 for the BMW M3 specific part.

The pulley is the exact same - the only difference is the bolt length. Discard the included bolt and re-use your very long idler bolt. You can use the new sheet metal dust shield, it is the same as the old one.

BMW 11287535860 (for N52 with short bolt)
INA 5320512100 aka 532 0512 10
https://www.fcpeuro.com/products/bmw...60#description

On the 70mm pulley, you can use a pick or small screwdriver to break the crimps (they are weak) on the included cast washer and it will slide / unscrew right off.

Also attached is a pic of my 117K mile belts compared to a new one. No cracks but the grooves are deep. The pulleys that came off my car were also still tight and greased, but replacing them at my mileage seemed like a good idea.

When re-installing the belts, I found it easiest to slide the belt over the smooth pulleys - specifically the tensioner pulley on both the alternator and AC sides. On the AC side you must have the belt already looped over the fixed idler pulley before screwing the idler pulley in or there is not enough space to squeeze the belt in between the pulley and fixed oil line.