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BO CL PULLEY-21577 RAM INA OEM
17mm BORE, 55mm OD, 36mm W, 11mm DEEP, 16x1.5mm THREAD, 22mm BELT, 10mm TO FIRST GROOVE, 6 GROOVE, CW, CLUTCH, INA
Specifications
- DIM 1:55mm OD x 17mm Bore
- DIM 2:M16 x 1.50 Thread
- DIM A (MM):17
- DIM B (MM):55
- DIM C (MM):35.5
- DIM D (MM):9.8
- FEATURE 1:100% New
- GROOVES:6
- SPECS FOR:Bosch IR Alternator
- SPECS:6-Groove Clutch Pulley
- TYPE:OAP
USED ON
- Porsche (2013-2016)
Replaces
- Bosch F 00M 599 441, Fiat 504088796, INA Bearing Co 535 0103 10, F-550532, F-550532.01, F-550532.02, F-550532.1, Porsche 9A160395501, PSA Peugeot Citroen 574087, Valeo 588129
LESTER NUMBERS
- 11726, 20895, 21092, 21555, 23834, 23835, 23836
UNIT NUMBERS
- Bosch 0 124 325 122, 0 124 525 064, 0 124 525 125, 0 125 711 039, 0 125 711 083, 0 125 711 111, 0 125 711 112, 0 125 711 117, 0 125 711 118, 0 125 811 039, 0 125 811 040, 0 125 811 061, 0 125 811 062, 1 986 A00 533, F 000 BL0 777, F 000 BL0 778; Citroen 5705 KL, 5705EH; Fiat 504057813, 504087183, 504204173; Iveco 5 801 580 939, 504 0578 13, 504087183, 504204173, 5801580941, 5801671985; Peugeot 5705 KL; Porsche 9A1-603-018-01, 9A1-603-018AX, 9A160301802, 9A2 603 018 00
Features & Benefits
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Genuine OEM replacement part
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Manufactured to original factory specifications
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Designed to match original fit, function, and performance
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Helps reduce belt vibration and accessory drive noise
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Supports smooth alternator operation during engine acceleration and deceleration
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Engineered for dependable long-term reliability
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Ideal for alternator rebuilding and repair
What Does an Alternator Clutch Pulley Do?
An alternator clutch pulley, also known as an overrunning alternator pulley (OAP) or overrunning alternator decoupler (OAD), allows the alternator rotor to continue spinning independently during engine deceleration. This helps reduce belt vibration, minimizes stress on the serpentine belt drive system, and improves overall accessory drive performance.
A properly functioning clutch pulley helps reduce belt noise, improves belt tensioner stability, and protects the alternator and related drive components from excessive shock loads. Replacing a worn or seized clutch pulley with a genuine OEM component helps restore the original operating characteristics intended by the manufacturer and promotes long-term charging system reliability.
Common Signs Replacement Is Needed
Replace the alternator clutch pulley if you notice:
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Chirping or squealing belt noise
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Excessive belt vibration
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Failing or bouncing belt tensioner
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Seized or locked pulley
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Free-spinning pulley in both directions
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Rough or noisy pulley bearing
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Premature serpentine belt wear
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Clutch pulley failure discovered during alternator rebuilding
Installation Recommendations
Installation should be performed by a qualified technician or experienced alternator rebuilder. Always use the correct clutch pulley removal and installation tools designed for your alternator application. Before installation, inspect the alternator shaft, threads, front bearing, belt tensioner, serpentine belt, and accessory drive components for signs of wear or damage.
Verify that the replacement pulley matches the original OEM pulley design, rotation, thread specifications, and overall dimensions. After installation, ensure the pulley operates smoothly and verify proper belt alignment and tension before returning the alternator to service.
While You're Rebuilding
Inspect other common wear components to help maximize charging system reliability:
Why Buy From RC Auto Electric?
RC Auto Electric specializes in genuine OEM and premium aftermarket alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of OEM and aftermarket electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.
Disclaimer
Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original OEM part, pulley style, thread specifications, dimensions, cross-reference numbers, and product photographs before installation. If you are unsure about compatibility, contact RC Auto Electric before ordering.
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Frequently Asked Questions
How do I confirm compatibility? +
Compare part numbers, dimensions and photos with the original component.
Is this OEM or aftermarket? +
This listing is for an aftermarket replacement part.
What should I verify before ordering? +
Check all fitment and application details before purchase.
Is professional installation recommended? +
Professional installation is recommended.
Where can I find related parts? +
Browse related starter and alternator categories on RCAutoElectric.