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  #1  
Old 03-21-2022, 11:22 PM
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N52 AC Stretch Belt Installation Tool

What tool is everyone using or recommending for the installation of a "stretch belt" on an N52 with 4-zone climate control?

The correct BMW tool is part number 83300496084 and you can visit here for an image of what that looks like, around $165

https://www.rmeuropean.com/Products/...2-MFG1220.aspx

Alternatively for only $22 there is a CTA tool but it's for an N62 with stretch AC belt. Not sure if anyone has used a more simple tool like this for the job.

https://www.amazon.com/CTA-Tools-345.../dp/B00VX0QJUQ

Thanks
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  #2  
Old 03-22-2022, 01:46 AM
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Look at the review stars! I would buy that for sure. I may need it I think n63 might use stretch belt.

My n55 doesn't have an ac belt.
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Old 03-22-2022, 01:10 PM
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This link worked great for me.
All you need is a vise, ball pein hammer and scrap of steel bar stock

https://xoutpost.com/bmw-sav-forums/...my-2008-a.html
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Old 03-23-2022, 03:20 PM
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Great link, thanks for sharing. I'm going to make one of the tools today.
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Old 04-14-2022, 08:09 PM
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Update. I tried making the DIY tool but definitely didn't work for me. I ended up buying the BMW genuine tool, and even with that tool, it was an extremely tight fit to get the belt up onto the pulleys. Takes about 1 minute with the tool, feels like you're going to injure yourself while using it.
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Old 04-15-2022, 10:57 AM
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Lisle 59370
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Old 04-15-2022, 01:55 PM
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In the info for that tool it says not for bmw however in the reviews somebody used on e70 but they didn't say which motor.

It's cheap I put in my cart for later. I believe wifes n63 uses. I think my n55 does not (only one serp belt with a ludicrously tight tensioner. )
Come to think of it, the tool would likely help install on my car also.
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Old 04-15-2022, 02:42 PM
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Actually I could be mistaken here. Did not realize the ac belt was inboard on the n52. I have used it on my 2 M57s and it works great for those. Still may be worth a try at <$20.

Last edited by Mistercamp; 04-15-2022 at 02:51 PM.
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Old 04-16-2022, 11:09 AM
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After installing using the BMW genuine tool, I would recommend anyone needing the tool to get the genuine tool. Even with it, installation was extremely tight to get the belt on. Using the wrong/cheap tool could result in damaging the pulley on the AC compressor which itself has a unique design, unlike most other BMW compressors.
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Old 04-16-2022, 11:35 AM
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Just looked up for N63 and it has a sliding crank pulley; remove the 4 bolts and turn the crank 180° and it loosens, replace belt and turn crank 180° to tighten and move the pulley back where you can reinstall the bolts.

So wife's and my car I'm good.

Have a customer with n52 motor however so I'm glad for this thread I'll likey be changing that belt this summer when I change his belt tensioner.
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