BMW N54 Engine Drive Belt Tensioner & Idler Pulley Kit with Billet Aluminium Power Steering Pulley for E82 / E88 135i & E90 / E91 / E92 / E93 335i / 335xi 2007 - 2010

Address the most critical accessory drive failure on your BMW N54 engine with this comprehensive drive belt tensioner and pulley kit, featuring an upgraded billet aluminium power steering pulley that permanently solves one of the N54's most well-known and dangerous failure modes. The factory plastic power steering pulley on N54-equipped 135i, 335i, and 335xi models is notorious for cracking and breaking apart — when this happens, the pulley can strike the front subframe, the serpentine belt comes off, and worst of all, the broken belt can be sucked into the engine timing cover where it causes catastrophic timing chain damage. This complete maintenance kit replaces all the high-wear accessory drive components (serpentine belt, tensioner assembly, both idler pulleys) and includes the critical billet aluminium power steering pulley upgrade that prevents the entire failure cascade from ever occurring.

Features:

• Complete N54 accessory drive maintenance kit – addresses all critical wear components in a single comprehensive package
• Billet aluminium power steering pulley upgrade – permanently replaces the failure-prone factory plastic pulley with rigid aluminium construction that will not crack, shatter, or fail under sustained load
• Premium serpentine drive belt – manufactured to OE specifications for proper power transfer to the alternator, power steering pump, and A/C compressor
• Drive belt tensioner assembly – maintains correct belt tension across all driving conditions and engine RPM ranges
• Dual idler pulleys included (80mm and 90mm) – complete idler set for full accessory drive system refresh
• Direct OE replacement design – matches factory specifications for clean, modification-free installation
• Engineered specifically for the BMW N54 twin-turbo engine – addresses the platform-specific failure modes common to high-performance N54 applications

Specifications:

• Condition: 100% Brand New
• Type: N54 Drive Belt Tensioner & Pulley Kit with Power Steering Pulley Upgrade
• Power Steering Pulley Material: Billet Aluminium (Upgrade)
• Quantity: 5-piece complete kit
• Position: Accessory Drive Belt System & Power Steering Pulley
• Purpose: Performance Replacement / Failure Prevention / Maintenance Kit

OE / Replacement Part Numbers:

• Power Steering Pulley: 32427553955
• Drive Belt & Tensioner Components:
• 11 28 7 628 652 / 11287628652
• 11 28 7 563 927 / 11287563927
• 11 28 7 556 251 / 11287556251
• 11 28 7 557 851 / 11287557851
• 11 28 7 568 247 / 11287568247
• 11 28 7 557 858 / 11287557858
• 7PK1855 (Serpentine Belt)

Fitment:

BMW N54 twin-turbo engine only. Verify your engine code before ordering.

• BMW E82 135i N54 (2008 – 2010)
• BMW E88 135i N54 (2008 – 2010)
• BMW E90 335i N54 Sedan (2007 – 2010)
• BMW E91 335i N54 Touring (2007 – 2010)
• BMW E92 335i N54 Coupe (2007 – 2010)
• BMW E93 335i N54 Convertible (2007 – 2010)
• BMW E90 / E91 / E92 / E93 335xi N54 (2007 – 2010)
• Compatible with N54 twin-turbo engines only – not compatible with N55 single-turbo, N52 naturally aspirated, or other engine variants
• Confirm engine code is N54 before ordering

Contents:

• 1x Serpentine Drive Belt
• 1x Accessory Drive Belt Tensioner Assembly
• 1x Accessory Drive Belt Idler Pulley (80mm)
• 1x Accessory Drive Belt Idler Pulley (90mm)
• 1x Billet Aluminium Power Steering Pulley

Tightening Torque Specifications:

• Drive Belt Tensioner Bolt: 40 Nm (30 ft-lbs)
• Drive Belt Idler Pulley 90mm Bolt: 38 Nm (~28 ft-lbs)
• Drive Belt Idler Pulley 80mm Bolt: 38 Nm (~28 ft-lbs)

Benefits:

• Permanently prevents the catastrophic N54 power steering pulley failure mode – billet aluminium construction will not crack, shatter, or break apart like the factory plastic pulley, eliminating the cascade of damage that occurs when the belt comes off and gets sucked into the timing cover
• Protects against catastrophic engine damage – timing chain damage from a sucked-in serpentine belt is one of the most expensive N54 repair scenarios. This kit eliminates the root cause
• Complete accessory drive refresh in a single kit – addresses all wear components simultaneously rather than replacing them piecemeal as failures occur
• Restores quiet, reliable accessory drive operation – eliminates the screeching, rumbling, and friction noises that develop as factory pulleys age
• Maintains all critical accessory functions – proper belt tension and pulley operation ensures reliable alternator charging, power steering assist, and A/C operation
• Significant cost savings compared to replacing components individually as they fail – complete kit pricing typically beats summed individual part costs
• Significant cost savings compared to BMW dealer N54 maintenance pricing while delivering equivalent quality and the critical billet aluminium pulley upgrade
• Particularly valuable for high-mileage N54 owners who have not yet replaced these components – proactive replacement prevents stranding and catastrophic damage

Installation Notes:

• Critical maintenance product: The N54 power steering pulley failure is one of the most well-documented and dangerous failure modes in the entire BMW platform. If your factory plastic pulley has not been replaced, install this kit immediately to prevent catastrophic damage
• Allow the engine to fully cool before beginning belt service to avoid burns from hot engine components
• Document the original belt routing before removal – take photos of the serpentine belt path before removing for accurate reinstallation
• Inspect the alternator pulley, water pump pulley, and crankshaft pulley during installation – worn components in the same drive system should be addressed simultaneously
• Use the specified tightening torque values for each component – over-tightening can damage threads or distort components, under-tightening can result in component loosening and failure
• Verify quiet, smooth accessory drive operation after installation – any continued noise indicates additional worn components requiring inspection
• Inspect the front timing cover area for any signs of previous belt damage – if your factory pulley has already failed, additional repair may be required
• Professional installation strongly recommended unless you have experience with BMW N54 accessory drive system service procedures
• If unsure about compatibility with your specific BMW variant or engine code, contact our team with your year, model, and engine code (must be N54) before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues