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Serpentine Belt Tensioner Pulley 11281748131 70mm for BMW - size: 11281748131

Serpentine Belt Tensioner Pulley 11281748131 70mm for BMW - size: 11281748131

Regular price $23.22 USD
Regular price Sale price $23.22 USD
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About this item

  • 70mm Serpentine Belt Tensioner Pulley — Replaces BMW 11281748131 / INA 532000110 Direct aftermarket accessory drive belt tensioner pulley (roller)​ for BMW inline-6 hydraulic tensioner systems. Replaces BMW 11281748131, 11-28-1-748-131, prior 11281726343 / 11-28-1-726-343​ and crosses INA 532 0001 10, FAG equivalent, Gates 38030, Continental V55006, Dayco APV2109, SKF VKM38004, Febi 06051, SNR GA350.21. Specs: 70mm OD, 24.8mm width, sealed precision deep-groove ball bearing, steel hub + GRP (glass-fiber reinforced plastic) rim with rubber dampening layer, centered bolt hole, ~0.175kg. Match old stamp 11281748131​ before order. This is the pulley roller only.
  • For BMW Inline-6 M50/M52/M54/S54 Hydraulic Tensioner (1991-2009) Engineered for M50, M50TU, M52, M52TU, S52, M54, M56, S54​ on E36/E46/E34/E39/E38/E53 X5/E83 X3/E85 Z4/Z3 with hydraulic serpentine tensioner. Covers 2.5/2.8/3.0/3.2L six-cyl (318/320/323/325/328/330/M3, 525/528/530, 728, X5 3.0i, X3 2.5/3.0, Z3/Z4 2.5/3.0/M).
  • Fixes Cold-Start Chirp, Idle Squeal & Bearing Growl Resolves pulley faults: belt chirps on cold start, squeals at idle/AC load, rhythmic growl from front of engine, visible rim cracks, belt starts jumping grooves. Original bearing seals dry out after 100k+ mi; rubber dampening layer cracks. New pulley restores smooth belt tracking. Spin test old: any roughness/play = dead; compare OD to 70mm.
  • Center-Bolt to Tensioner Arm, Reuse Factory Bolt + Torque Remove serpentine belt, hold tensioner arm with T60/M10 wrench, remove 1× center bolt (often 24mm internal or E-socket depending year), slide old pulley off shoulder, clean arm shaft, seat new pulley, reuse original M8 class-10.9 bolt, torque to 28 N·m (21 ft-lb), refit belt checking alignment in all grooves. Critical:​ this pulley has a centered bore​ — if your old pulley has an offset/elongated hole, you need the eccentric version (different number), not this one.
  • Confirm 70mm + Centered Hole + Hydraulic Arm Before Ordering This pulley has 70mm OD, 24.8mm width, centered 10mm-class bore, GRP rim, single sealed bearing, and mounts on the hydraulic tensioner swing arm​ (not a fixed idler bracket). Before ordering, photo old pulley and confirm (1) ~70mm OD, (2) centered hole, (3) stamp 11281748131, (4) engine is M50-M54/S54 inline-6 with hydraulic tensioner. Applications outside this scope (N42/N46/N52/N54/N55 chain-driven or mechanical-tensioner six, V8/V10, mechanical-tensioner E36, M20/M30) use different pulley numbers and are not covered.
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