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    Schaeffler INA
    Supplementary article/info 2 requires special tools for mounting
    Width (mm) 36.5
    Ø1/ Ø2 (mm) 52,0/17,0
    For manufacturer number
    • f-238419.xx
    • f-239973.xx
    Number of grooves 5
    Svhc no svhc present!
    Distance to first groove (mm) 14.9
    Product number: 535 0129 10

    Ina Overrunning Alternator Clutch Pulley For Mercedes-benz A-class B-class

    Price excl. vat.
    £ 31,45

    Description


    INA Belt Drive Technology

    Overrunning Alternator Pulley (OAP)

    The INA OAP uses a one-way clutch so the alternator can “free-wheel” during sudden belt deceleration. This calms belt vibration, reduces noise at shut-down/gear changes, and protects the tensioner and belt for longer life.

    Lower NVH Stabilised FEAD OE-grade reliability
    INA Overrunning Alternator Pulley main view
    INA OAP packaging view INA OAP close-up view INA OAP installed view

    What It Does

    • One-way clutch: allows the alternator rotor to coast when the belt slows suddenly (overrun), reducing belt snap and chirp.
    • Smoother accessory drive: helps the tensioner work within its normal range and limits oscillation.
    • Longer component life: less stress on belt, tensioner, alternator bearings, and other FEAD parts.

    When to Replace

    • Chirping at engine shut-down or during shifts; rumble/squeal from alternator area.
    • Tensioner arm “flutters” or sits off-center at idle; belt tracking issues.
    • Alternator charging faults due to belt slip or pulley clutch seizure.
    • Excessive play/roughness when the pulley is checked off-vehicle.
    Important: Fit the same type the vehicle was built with. Don’t swap an OAP for an OAD (decoupler) or a solid pulley — they are not interchangeable.

    How to Fit (Universal Guide)

    1. Preparation: Engine cold, battery disconnected. Photograph belt routing. Remove the FEAD belt.
    2. Lock the rotor: Use the correct alternator holding tool (insert in the rotor shaft) and a matching OAP removal socket for the pulley splines/hex.
    3. Remove old pulley: Hold the rotor steady; loosen the pulley in the correct direction (usually standard thread, but verify OE info). Remove any dust cap/shroud.
    4. Check & clean: Inspect alternator shaft and threads; clean and lightly degrease. Do not grease the belt or pulley grooves.
    5. Install new INA OAP: Thread on by hand to avoid cross-threading. Hold rotor and torque the pulley to the manufacturer’s spec. Refit the protective cap.
    6. Refit belt & test: Route belt, ensure all ribs seat. Start engine, watch tensioner movement, listen for noise, and confirm charging performance.

    Always follow the exact torque values and procedures in the workshop manual. Use the proper INA/REPXPERT special tools to avoid alternator damage.

    Quick Function Check (Off-Vehicle)

    • Pulley should rotate freely in the overrun direction and lock in the drive direction.
    • Any grinding, binding, or free-wheeling both ways = replace.
    Manufacturer Productnumber
    mercedes-benz 266 154 09 02 , 2661540902
    mercedes-benz 266 154 13 02 , 2661541302
    mercedes-benz 266 155 01 15 , 2661550115
    mercedes-benz 2661540902
    mercedes-benz 2661541302
    mercedes-benz 2661550115
    mercedes-benz A 266 154 09 02 , A2661540902
    mercedes-benz A 266 154 13 02 , A2661541302
    mercedes-benz A 266 155 01 15 , A2661550115
    mercedes-benz A2661540902
    mercedes-benz A2661541302
    mercedes-benz A2661550115
    Usage numbers
    AS-PL AFP3015
    AUTEX 654320
    BREDA LORETT CR 3690
    BREDA LORETT CR3690
    CONTINENTAL CTAM AP9011
    DAYCO ALP2408
    FEBI BILSTEIN 27841
    GATES 7789-10056
    GATES 778910056
    GATES OAP7064
    IPD 15-3315
    IPD 153315
    RUVILLE 55186
    SCHAEFFLER GRUPPE 535 0129 10
    SCHAEFFLER GRUPPE 535012910
    Schaeffler INA F-239973
    Schaeffler INA F-239973.01
    Schaeffler INA F-239973.02
    Schaeffler INA F-239973.03
    Schaeffler INA F-239973.04
    Schaeffler INA F-239973.05
    Schaeffler INA F-239973.06
    Schaeffler INA F239973
    Schaeffler INA F23997301
    Schaeffler INA F23997302
    Schaeffler INA F23997303
    Schaeffler INA F23997304
    Schaeffler INA F23997305
    Schaeffler INA F23997306
    SKF VKM 03818
    SKF VKM03818
    SNR GA751.18
    SNR GA75118
    TRIPLE FIVE 238339
    TRIPLE FIVE 3 5366 0
    TRIPLE FIVE 3 5366 1
    TRIPLE FIVE 353660
    TRIPLE FIVE 353661
    VAICO V30-1365
    VAICO V301365
    VALEO 2601991
    VALEO 593977
    VALEO 595386
    VALEO TG11C035
    VALEO TG11C074
    ZEN 5510
    Manufacturer Model Version Engine code Construction type Construction start Construction end Pk Power kw
    mercedes-benz mercedes-benz

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