Hayden 5054 Accessory Drive Belt Idler Assembly - Alternator
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Hayden
 Idler Assembly

Hayden 5054 Accessory Drive Belt Idler Assembly - Alternator

Brand Hayden 5054
Position Alternator
Belt Type Back Idler
Belt Width IN 1.125
Belt Width MM 28.575
Color Black
Description Idlers / Tensioners
Groove Smooth
Inside Diameter 0.31
Length 6.25
Material Plastic
Mounting Hole Diameter .32
Mounting Hole Quantity 2
O.D. MM 69.850
Outside Diameter 2.750
Pulley Width IN 1.18
Pulley Width MM 28
Style Idler Assembly
Type Tensioners and Pulleys
Product line Idler Assembly
Fits BMW · 8 vehicles

Idler assembly. Smooth pulley design helps keep the accessory drive belt tracking properly.

Plastic construction. Lightweight black housing for a clean, durable replacement.

Back idler. Built as a tensioner and pulley component for the belt drive system.

Cross-references Four Seasons 45054, Four Seasons 89091 and Gates 38065 for the same application. See all 9.

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Hayden 5054 Idler Assembly for BMW 840Ci

The Hayden 5054 idler assembly is a black plastic accessory drive belt component built for specific BMW applications that use a back idler, smooth groove pulley, and bracket-mounted layout. It is a direct-fit style part for 1994-1997 BMW 840Ci models with alternator-related and accessory drive routing requirements.

Key Features

  • Brand: Hayden Idler Assembly
  • Part number: 5054
  • Accessory drive belt idler assembly with smooth groove design
  • Plastic construction with black finish
  • Back idler belt type for accessory drive belt system service
  • Mounting hole quantity: 2
  • Outside diameter: 2.750 in. / 69.850 mm
  • Belt width: 1.125 in. / 28.575 mm
  • Pulley width: 1.18 in. / 28 mm

Product Details

The Hayden 5054 idler assembly is part of Hayden’s Idler Assembly line for accessory drive belt system components. It is engineered as a smooth, back-idler style pulley assembly with a 2-hole mounting pattern and dimensions that match the specified BMW application. This part cross-references Gates 38065 for the same application. For BMW 840Ci service, the Hayden 5054 supports accessory belt routing where the idler assembly is used with bracket-mounted configurations.

Compatible With 1994-1997 BMW 840Ci, N/A, w/ Bracket; Alternator, Water Pump, Power Steering; Idler Assembly. Compatible With 1994-1997 BMW 840Ci, Alternator, w/ Bracket; Idler Assembly. Search terms such as BMW 840Ci accessory drive belt idler assembly, BMW 840Ci alternator idler pulley, and Hayden 5054 idler assembly apply to this part.

Common Issues This Part Addresses

  • Worn or noisy accessory drive belt idler pulley
  • Belt tracking problems caused by pulley wear
  • Improper belt routing in bracket-mounted accessory drive systems
  • Visible pulley damage, cracking, or surface wear
  • Accessory belt vibration related to a failing idler assembly

Installation Notes and Tips

Verify the mounting hole pattern, pulley width, outside diameter, and belt type before installation. Confirm the vehicle uses the listed bracket-mounted configuration and smooth back-idler layout. Inspect the accessory drive belt, brackets, and adjacent pulleys for wear before replacing the idler assembly. Match the application to the correct BMW 840Ci position listed in the fitment data.

Quality Assurance

Hayden supplies this idler assembly as a cataloged accessory drive belt system component with application-specific dimensions and interchange references for identification. Confirm part number 5054 against the vehicle’s belt routing and bracket configuration before ordering.

Related reading

This part fits 8 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1997BMW840CiN/Aw/ Bracket; Alternator, Water Pump, Power Steering; Idler Assembly
1997BMW840CiAlternatorw/ Bracket; Idler Assembly
1996BMW840CiN/Aw/ Bracket; Alternator, Water Pump, Power Steering; Idler Assembly
1996BMW840CiAlternatorw/ Bracket; Idler Assembly
1995BMW840CiN/Aw/ Bracket; Alternator, Water Pump, Power Steering; Idler Assembly
1995BMW840CiAlternatorw/ Bracket; Idler Assembly
1994BMW840CiN/Aw/ Bracket; Alternator, Water Pump, Power Steering; Idler Assembly
1994BMW840CiAlternatorw/ Bracket; Idler Assembly
Directly replaces or cross-references 9 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 45054Four Seasons — 89091Gates — 38065Hayden — 5054Wix — 4905883521311281742013A89343CWK835213