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Description
Alternator Overunner Pulley Bmw E87,E46 ,E90,E61 N42B20,N46B20,N52B30 (MAP-100797)Alternator Freewheel Clutch for BMW MINI MAP 100797 This alternator freewheel clutch is a direct replacement part for the vehicle applications listed below. 6 grooves, width 38,3 mm, diameter 49,0 17,0 mm. This part requires special tools for mounting observe service information. Confirm compatibility by matching OEM reference numbers, engine chassis details, and model year. VIN check is recommended where variants exist. Key Details SKU MAP 100797
Alternator Freewheel Clutch for BMW / MINI – MAP-100797
This alternator freewheel clutch is a direct replacement part for the vehicle applications listed below. 6 grooves, width 38,3 mm, diameter 49,0/17,0 mm. This part requires special tools for mounting — observe service information. Confirm compatibility by matching OEM reference numbers, engine/chassis details, and model year. VIN check is recommended where variants exist.
Key Details
- SKU
- MAP-100797
- Component
- Alternator freewheel clutch
- OEM References
-
- 12 31 7 516 105 (BMW)
- 12 31 7 516 723 (BMW)
- 12 31 7 516 724 (BMW)
- 12 31 7 521 178 (BMW)
- 12 31 7 521 382 (BMW)
- 12 31 7 521 385 (BMW)
- 12 31 7 521 491 (BMW)
- 12 31 7 525 376 (BMW)
- 12 31 7 532 271 (BMW)
- 12 31 7 532 965 (BMW)
- 12 31 7 532 967 (BMW)
- 12 31 7 532 968 (BMW)
- 12 31 7 516 105 (MINI)
- 12 31 7 516 723 (MINI)
- 12 31 7 516 724 (MINI)
- 12 31 7 521 178 (MINI)
- 12 31 7 521 382 (MINI)
- 12 31 7 521 385 (MINI)
- 12 31 7 521 491 (MINI)
- 12 31 7 525 376 (MINI)
- 12 31 7 532 271 (MINI)
- 12 31 7 532 965 (MINI)
- 12 31 7 532 967 (MINI)
- 12 31 7 532 968 (MINI)
- Primary Fitment
- BMW 118i [E87] N46B20 (2005–2007)
- Included
- Alternator freewheel clutch
- Specs
- 6 grooves; distance to first groove 11,6 mm; width 38,3 mm; diameter 49,0/17,0 mm; requires special tools for mounting
Key Benefits
- OEM reference numbers listed for cross-checking before ordering
- 6-groove pulley specification provided to match the alternator drive setup
- Dimensions supplied to help confirm compatibility where variations exist
- Service note: requires special tools for mounting (observe service information)
OEM Reference Numbers
- BMW: 12 31 7 516 105; 12 31 7 516 723; 12 31 7 516 724; 12 31 7 521 178; 12 31 7 521 382; 12 31 7 521 385; 12 31 7 521 491; 12 31 7 525 376; 12 31 7 532 271; 12 31 7 532 965; 12 31 7 532 967; 12 31 7 532 968
- MINI: 12 31 7 516 105; 12 31 7 516 723; 12 31 7 516 724; 12 31 7 521 178; 12 31 7 521 382; 12 31 7 521 385; 12 31 7 521 491; 12 31 7 525 376; 12 31 7 532 271; 12 31 7 532 965; 12 31 7 532 967; 12 31 7 532 968
Product Specifications
| Specification | Value |
|---|---|
| Number of grooves | 6 |
| Distance to first groove [mm] | 11,6 |
| Width [mm] | 38,3 mm |
| Diameter 1 / 2 [mm] | 49,0/17,0 mm |
| For manufacturer number | F-238005.XX; F-230329.XX |
| Supplementary info | Requires special tools for mounting; Observe service information |
Vehicle Fitment
- BMW – 118i [E87] N46B20 (2005–2007)
- BMW – 120i [E87] N46B20 (2005–2007)
- BMW – 120i [E87] N46B20B,C (2007–2011)
- BMW – 130i [E87] N52B30 (2006–2011)
- BMW – 318i [E46] N42B20 (2001–2005)
- BMW – 318Ti [E46] N42B20 (2001–2005)
- BMW – 320D [E46] M47D20 (2000–2005)
- BMW – 320D [E90] M47D20 (2005–2007)
- BMW – 320i [E90/E91] N46B20 (2005–2012)
- BMW – 323i [E90] N52B25 (2005–2007)
- BMW – 325i [E90] N52B25 (2005–2013)
- BMW – 330i [E90] N52B30 (2005–2007)
- BMW – 330i [E90/E91] N53B30A (2007–2013)
- BMW – 523i [E60] N52B25 (2005–2010)
- BMW – 523i [E60] N52B25A (2007–2010)
- BMW – 525I [E60] N52B25 (2004–2010)
- BMW – 530i [E60] N52B30 (2005–2007)
- BMW – 530i [E60] N53B30 (2007–2010)
- BMW – X1 sDRIVE 18i [E84] N46B20B (2010–2014)
- BMW – X3 2.0i [E83] N46B20 (2005–2010)
- BMW – Z4 2.0i [E85] N46B20 (2006–2008)
Fitment Notes
- Always match by OEM reference number(s) and vehicle details before ordering.
- Confirm exact fitment using your VIN, engine code, or chassis/platform details if multiple variants exist.
- Trust signal: OEM references and fitment details are provided to support accurate cross-checking.
- Service note: this part requires special tools for mounting — observe service information.
- South Africa nationwide delivery available – contact us for fitment assistance.
Common Questions
Does this alternator freewheel clutch fit my BMW?
This part (MAP-100797) is listed for the fitments shown on this page. Confirm by matching OEM reference numbers and verifying VIN/engine/chassis where variants exist.
What OEM part numbers does this replace?
Cross-references include 12 31 7 516 105, 12 31 7 516 723, 12 31 7 516 724, 12 31 7 521 178, 12 31 7 525 376, and others listed above (BMW/MINI). Match at least one OEM reference to your original part before ordering.
Do I need special tools to install this?
Yes. The supplied service information notes that this part requires special tools for mounting. Installation should follow the manufacturer service procedure.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 747 reviews
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Product Reviews
★★★★★ 5
Comfortable and easy to set up
Color: Black, Color: Black
I’m happy with this chair. It was not hard to assemble, and it feels stable after putting everything together. The mesh back is comfortable and breathable, so it doesn’t feel too hot when sitting for a while. The seat cushion is also thicker than I expected and feels soft enough for daily use. I like the adjustable headrest and the back support, especially for working at a desk. The chair looks simple and clean, and the wheels move smoothly. Good value for a home office chair.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
★★★★★ 5
Exactly the Desk Chair I Was Looking For
Color: Black
had been needing a new desk chair for a while, and this one has been a great addition to my workspace. I use it every day while working, and it feels very comfortable, even when sitting for long periods of time. The seat provides good support, and the backrest helps me stay comfortable throughout the day.
Assembly was straightforward, and the instructions were easy to follow. I also like how well it fits in my workspace and how nice it looks. So far, I am very happy with the comfort and overall quality. It has definitely made my workdays more enjoyable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2026
★★★★★ 4
very ergonomic
Color: Deep Black, Color: Deep Black
I bought this as a replacement for one of those gaming chairs that kills your back with a little lumbar pillow and this one is muuuuch better. the back support is everything you’d need and got rid of my neck pain after long periods of sitting and the seat cushion is supportive but still comfortable. It’s the kind of chair that you don’t really think about much because it’s so natural to sit in that you forget it’s there. The armrests flipping is a really nice feature too. One star off only because the head rest is so far back that i can’t really rest my head on it and every part of the chair that’s cloth is made of the same mesh texture like the armrests and seat. but i have no other complaints this is a good chair
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Reviewed in the United States on March 14, 2026
★★★★★ 5
Comfortable Ergonomic Chair for Long Workdays
Color: Black, Color: Black
I’ve been using this chair for my home office, and it’s been a great addition to my workspace. The seat cushion is thick and comfortable, even after several hours of sitting, and the mesh back keeps good airflow throughout the day. I especially like the adjustable headrest, which provides extra neck support when leaning back during breaks. Assembly was straightforward, the chair feels sturdy, and the wheels roll smoothly on my floor. The all-black design also gives it a professional look that fits well in any office setup. Overall, it’s a comfortable and affordable ergonomic chair that offers excellent value for the price.
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Reviewed in the United States on May 28, 2026
★★★★★ 3
Sturdy but uncomfortable
Color: Black
The seat itself is sturdy and easy to put together, I’ve now had the product for 8 months and had no issues wear/tear despite nearly daily use, but… it’s not comfy, at all. The seat cushion has a texture to it that scrapes at my legs if I don’t have an extra pillow on it or am wearing shorts. Additionally, the seat pillow is just kind of hard. It doesn’t give very much at all, so if I sit on it for more than an hour or two at a time my butt starts to get really sore. It works as a budget option, but invest in a good seat pillow if you plan to sit in it for any length of time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026