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The INA F-559401 is a 7-groove alternator freewheel (overrunning) clutch pulley to suit Mitsubishi alternators.
Brand: INA | Replacement For: Mitsubishi | Outer Diameter: 52.5mm | Grooves: 7 | Thread: M17x1.5 | Part No: F-559401
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A freewheel pulley has a one-way clutch that drives the alternator under acceleration but lets it overrun when the engine slows. This reduces belt slip, vibration and wear on the belt and tensioner, which matters most on diesel engines. It suits Mitsubishi alternators, including Nissan applications.
A rattling belt, chirping at idle or a pulley that turns both ways or locks solid are common signs of failure. Fitting needs the correct splined or Torx tool for the M17x1.5 thread. Check the pulley dimensions and cross-references against the original, and replace the belt and tensioner if they are worn.
| Specification | Value |
|---|---|
| Brand | INA |
| Replacement For | Mitsubishi |
| Inner Diameter | 17.0mm |
| Outer Diameter | 52.5mm |
| Length (L1 / L2) | 42.0mm / 14.5mm |
| Grooves | 7 |
| Thread | M17x1.5 |
| Cross Reference | INA 535014710, Nissan 23151-6N210 |
| Part Number | F-559401 |
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