Restore smooth alternator operation with this OEM 6-groove decoupler pulley, designed for compatible Denso Hairpin IR/IF alternators. This original equipment replacement helps reduce accessory belt vibration and supports reliable alternator performance. Fits select Acura and Honda applications, including the MDX, RDX, RLX, Accord, Odyssey, Pilot, Passport, and Ridgeline. Replaces Honda 31141-RV0-A01 and is compatible with Lester numbers 11573, 11600, 11670, 11672, 11773, and 11774.
Product Type: OEM Alternator Decoupler Pulley
Alternator Manufacturer: Denso
Alternator Series: Denso Hairpin IR/IF
Pulley Type: Decoupler
Number of Grooves: 6
Condition: 100% New
Application: Alternator Rebuilding and Repair
11573, 11600, 11670, 11672, 11773, 11774
Honda: 31141-RV0-A01
Acura:
06311-5J6-505RM, 31100-5J6-A01, 31100-5J6-A01RM, 31100-R8A-A01, 31100-R8A-A01RM, 31100-R9P-A01, 31100-R9P-A01RM, CSJ89, CSK51
Denso:
104210-1240, 104210-1600, 104210-1890, 104210-1990, 104211-8300, 104211-8510, TN104210-1600, TN104211-8300
Honda:
06311-5J6-505RM, 06311-RV0-505RM, 31100-5G0-A02, 31100-5G0-A02RM, 31100-5J6-A01, 31100-5J6-A01RM, 31100-5J6-A51, 31100-R70-A11, 31100-R70-A11RM, 31100-R9P-A01, 31100-R9P-A01RM, 31100-RV0-A01, 31100-RV0-A01RM, CSJ24, CSJ60, CSJ99, CSK30 6T, CSK51
| Make | Model | Year | Engine |
|---|---|---|---|
| Acura | MDX | 2014–2020 | V6 3.5L 3471cc |
| Acura | MDX | 2018 | V6 3.0L 2997cc |
| Acura | RDX | 2013–2015 | V6 3.5L 3471cc |
| Acura | RDX | 2016–2018 | V6 3.5L 3471cc |
| Acura | RLX | 2014–2020 | V6 3.5L 3471cc J35Y4 |
| Honda | Accord Crosstour | 2011 | V6 3.5L 3471cc |
| Honda | Accord | 2011–2012 | V6 3.5L 3471cc J35Z2 |
| Honda | Accord | 2013–2014 | V6 3.5L 3471cc J35Y1 |
| Honda | Accord | 2015–2017 | V6 3.5L 3471cc J35Y1; J35Y2 |
| Honda | Crosstour | 2012 | V6 3.5L 3471cc |
| Honda | Odyssey | 2011–2013 | V6 3.5L 3471cc |
| Honda | Odyssey | 2018–2026 | V6 3.5L 3471cc |
| Honda | Passport | 2019–2025 | V6 3.5L 3471cc |
| Honda | Pilot | 2012–2015 | V6 3.5L 3471cc |
| Honda | Pilot | 2016–2022 | V6 3.5L 3471cc |
| Honda | Ridgeline | 2012–2014 | V6 3.5L 3471cc |
| Honda | Ridgeline | 2017–2026 | V6 3.5L 3471cc |
Fitment Note: Verify the original alternator number, Lester number, Denso Hairpin IR/IF series, OEM 6-groove decoupler design, Honda 31141-RV0-A01 cross-reference, and product photographs before ordering. Vehicle compatibility may vary by engine configuration, alternator equipment, and production revisions.
Genuine OEM replacement clutch / decoupler pulley for compatible alternators
Manufactured to original equipment specifications for proper fit and function
Helps maintain smooth and efficient alternator drive operation
Designed to reduce excessive accessory belt vibration and unwanted noise
Helps minimize sudden belt loading during engine speed changes
Supports proper operation of the alternator and accessory belt drive system
Designed to replace worn, damaged, or malfunctioning original equipment pulleys
Maintains the original pulley design and operating characteristics for compatible applications
Engineered for dependable performance, durability, and long service life
Ideal for professional rebuilders, automotive repair shops, and DIY technicians
Suitable for alternator rebuilding, maintenance, and repair
Cross-referenced to OEM alternator and pulley part numbers for easier identification
An OEM alternator clutch / decoupler pulley is an original equipment mechanical drive component designed to transfer rotational power from the engine's accessory belt to the alternator while helping manage changes in rotational speed and belt tension.
Unlike a conventional solid alternator pulley, an overrunning clutch pulley (OAP) incorporates a one-way clutch mechanism that allows the alternator rotor to continue rotating when engine speed decreases. This helps reduce sudden belt loading, vibration, and unnecessary stress on the accessory drive system.
An overrunning decoupler pulley (OAD) provides a similar overrunning function while incorporating a torsional spring mechanism that helps absorb engine speed fluctuations and reduce belt vibration.
A worn, seized, or malfunctioning clutch / decoupler pulley can contribute to excessive belt movement, abnormal tensioner operation, unwanted noise, or premature wear of related accessory drive components. Replacing a faulty pulley with the correct OEM replacement can help restore the original pulley operating characteristics and support reliable accessory belt performance.
OEM clutch and decoupler pulley designs vary by alternator manufacturer, series, and vehicle application. Always verify the original equipment part number, pulley type, specifications, and compatibility before ordering.
Consider inspecting or replacing the clutch / decoupler pulley if you notice:
Excessive serpentine belt vibration or flutter
Unusual rattling, chirping, or squealing noises near the alternator
Excessive belt tensioner movement during engine operation
Pulley seized or locked in both directions when tested according to its design
Pulley slipping or failing to engage properly
Grinding, rattling, or abnormal mechanical noise from the pulley
Excessive pulley wobble or noticeable mechanical play
Premature serpentine belt or tensioner wear
Visible cracks, damage, or deterioration of the pulley assembly
Irregular accessory belt operation during acceleration or deceleration
Note: These symptoms may also be caused by worn belts, tensioners, bearings, or other accessory drive components. Proper diagnosis is recommended before replacement.
Installation should be performed by a qualified technician or experienced alternator rebuilder. Before replacing the OEM clutch / decoupler pulley, disconnect the battery and inspect the alternator shaft, accessory belt, belt tensioner, mounting hardware, and surrounding drive components for damage or deterioration.
Inspect the original pulley for excessive wear, mechanical play, seized operation, or damage to the clutch or decoupling mechanism. Use the appropriate alternator pulley removal and installation tools to prevent damage to the alternator shaft and internal components.
Ensure the replacement OEM pulley matches the original pulley type, groove count, outside diameter, shaft connection, thread specifications, and rotational characteristics. Overrunning clutch pulleys and overrunning decoupler pulleys are not automatically interchangeable.
Always verify the Lester number, OEM alternator number, original pulley part number, alternator series, pulley specifications, cross-reference numbers, and product photos before ordering. Follow the applicable manufacturer's installation and torque specifications.
After installation and reassembly, inspect pulley alignment, verify proper belt operation, and bench-test the alternator to confirm charging output and overall operation before returning it to service.
When replacing an OEM alternator clutch / decoupler pulley, consider inspecting other components that may require replacement:
Important: Components listed above are inspection recommendations and are sold separately unless specifically stated otherwise in the product description.
R&C AUTO ELECTRIC PARTS specializes in 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 detailed specifications and cross-reference information to help simplify part identification and reduce ordering mistakes.
Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect OEM alternator clutch / decoupler pulley compatibility. Always compare the Lester number, OEM alternator number, original pulley part number, alternator series, pulley type, groove count, outside diameter, shaft connection, specifications, cross-reference numbers, and product photographs before ordering.
Overrunning clutch pulleys (OAP) and overrunning decoupler pulleys (OAD) are different designs and should not be considered interchangeable unless specifically approved for the application.
This listing is for the OEM alternator clutch / decoupler pulley only unless otherwise specified in the product description. If you are unsure about compatibility or product specifications, contact R&C AUTO ELECTRIC PARTS before ordering.
