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Replacement and OEM Parts for Idler Pulley
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Idler Pulley

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  • OEM (Genuine) Tensioner Assy., Auto

    PartNumber: 31170-RAA-A02
    OEM Tensioner Assy., Auto - 31170-RAA-A02
    Product Specifications
    • Other Names: Belt Tensioner, Tensioner
    • Item Dimensions: 7.5 x 6.0 x 5.0 inches
    • Item Weight: 3.40 Pounds
    • Fitment Type: Direct Replacement
    • Part Description: Tensioner Assy., Auto
    More Info
    $111.02 MSRP: $156.82
    You Save: $45.80 (30%)
  • Dorman OE Solutions Vacuum Pump Pulley - 300-702

    Dorman® OE Solutions Vacuum Pump Pulley

    PartNumber: 300-702
    Product Specifications
    • Belt Type: Serpentine
    • Color: Black
    • Installation Hardware Included: No
    • Installation Instructions Included: No
    • Item Grade: Standard Replacement
    • Material: Steel
    • Mounting Hole Quantity: 1
    • OE Part Number: 15589757
    • Outside Diameter: 4.91
    • Package Contents: 1 Vacuum Pump Pulley
    • Pulley Type/Grooves: Smooth
    • UPC: 019495240006
    • Width: 0.98
    • Part Description: OE Solutions Vacuum Pump Pulley
    More Info
    $69.41
  • Gates Drivealign OE Exact Drive Belt Idler Pulley - 36422

    Gates® Drivealign OE Exact Drive Belt Idler Pulley

    PartNumber: 36422
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: V-Ribbed Grooved
    • Material: Steel
    • Number of Grooves: 6
    • Number Of Pulleys: 1
    • OE Comparison Rating: OE Exact
    • Outside Diameter: 2.95"
    • Pulley 1 Flanged: Yes
    • UPC: 072053073058
    • Width: 28 mm
    • Part Description: Drivealign OE Exact Drive Belt Idler Pulley
    More Info
    $167.57
  • Four Seasons Drive Belt Idler Pulley - 45030

    Four Seasons® Drive Belt Idler Pulley

    PartNumber: 45030
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 0.875
    • Belt Width MM: 22.225
    • Bore Dia. IN: 0.668
    • Color: Black
    • Description: Idler / Tensioner Pulley
    • Groove Quantity: 6
    • I.D. MM: 26.0
    • Inside Diameter: 0.90
    • Material: Plastic
    • Meets / Exceeds OEM?: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware?: Not Included
    • O.D. MM: 74.613
    • Outside Diameter: 2.9375
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1.062
    • Pulley Width MM: 26.9
    • Style: Idler / Tensioner Pulley
    • UPC: 096361450301
    • Width: 26.9
    • Part Description: Drive Belt Idler Pulley
    More Info
    $15.27
  • SKF Drive Belt Tensioner Assembly - ACT31002

    SKF® Drive Belt Tensioner Assembly

    PartNumber: ACT31002
    Product Specifications
    • Quantity Per Application: 1
    • UPC: 085311485838
    • Part Description: Drive Belt Tensioner Assembly
    More Info
    $41.42
  • Cardone Reman Remanufactured Vacuum Pump Pulley - 64-1024P

    Cardone Reman® Remanufactured Vacuum Pump Pulley

    PartNumber: 64-1024P
    Product Specifications
    • E-Waste: No
    • Height: 5.25''
    • Length: 8''
    • Type: Flat Pulley
    • Warranty: 12 Months / 18,000 Miles
    • Width: 6.125''
    • Part Description: Remanufactured Vacuum Pump Pulley
    More Info
    $29.24
  • VAICO Drive Belt Idler Pulley - V48-0436

    VAICO® Drive Belt Idler Pulley

    PartNumber: V48-0436
    Product Specifications
    • Length [mm]: 102
    • Packaging height [cm]: 6,5
    • Packaging width [cm]: 10,1
    • Weight [kg]: 0,242
    • Part Description: Drive Belt Idler Pulley
    More Info
    $43.07
  • OEM (Genuine) Pulley, Idle

    PartNumber: 31190-RRA-A00
    OEM Pulley, Idle - 31190-RRA-A00
    Product Specifications
    • Other Names: Pulley
    • Item Dimensions: 3.2 x 3.2 x 1.1 inches
    • Item Weight: 1.30 Pounds
    • Fitment Type: Direct Replacement
    • Replaces: 31190-PRA-000
    • Part Description: Pulley, Idle
    More Info
    $59.82 MSRP: $84.49
    You Save: $24.67 (30%)
  • Dorman OE Solutions Vacuum Pump Pulley - 300-701

    Dorman® OE Solutions Vacuum Pump Pulley

    PartNumber: 300-701
    Product Specifications
    • Belt Type: V-belt
    • Color: Black
    • Installation Hardware Included: No
    • Installation Instructions Included: No
    • Item Grade: Standard Replacement
    • Material: Steel
    • Mounting Hole Quantity: 1
    • OE Part Number: E9TZ2L487A
    • Outside Diameter: 4.82
    • Package Contents: 1 Vacuum Pump Pulley
    • Pulley Type/Grooves: V-belt
    • UPC: 019495239994
    • Width: 0.75
    • Part Description: OE Solutions Vacuum Pump Pulley
    More Info
    $45.63
  • Gates Drivealign OE Exact Drive Belt Idler Pulley - 36276

    Gates® Drivealign OE Exact Drive Belt Idler Pulley

    PartNumber: 36276
    Product Specifications
    • Bearing Bore Inside Diameter 1: 8
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • OE Comparison Rating: OE Exact
    • Outside Diameter: 3.15"
    • Pulley 1 Flanged: No
    • UPC: 072053393835
    • Width: 17
    • Part Description: Drivealign OE Exact Drive Belt Idler Pulley
    More Info
    $114.29
  • Dayco No Slack Driver Side Light Duty Idler Tensioner Pulley - 89566

    Dayco® No Slack Driver Side Light Duty Idler Tensioner Pulley

    PartNumber: 89566
    Product Specifications
    • Bearing Inner Diameter 1: 30
    • Bearing Inner Diameter 2: 11.2
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 10 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 90
    • Pulley Width: 41
    • UPC: 036687915955
    • Part Description: No Slack Driver Side Light Duty Idler Tensioner Pulley
    More Info
    $109.55
  • Four Seasons Drive Belt Idler Pulley - 45922

    Four Seasons® Drive Belt Idler Pulley

    PartNumber: 45922
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 1.125
    • Belt Width MM: 28.575
    • Bore Dia. IN: .472
    • Color: Black
    • Description: Idler / Tensioner Pulley
    • Groove Quantity: 7
    • I.D. MM: 12.000
    • Inside Diameter: .472
    • Material: Steel
    • Meets / Exceeds OEM?: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware?: Not Included
    • O.D. MM: 70.0
    • Outside Diameter: 2.750
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1.062
    • Pulley Width MM: 27
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459229
    • Width: 27
    • Part Description: Drive Belt Idler Pulley
    More Info
    $44.06
  • SKF Accessory Drive Belt Pulley - ACP63002

    SKF® Accessory Drive Belt Pulley

    PartNumber: ACP63002
    Product Specifications
    • Quantity Per Application: 1
    • UPC: 085311533942
    • Part Description: Accessory Drive Belt Pulley
    More Info
    $32.24
  • OEM (Genuine) Pulley, Idler

    PartNumber: 31180-RAA-A01
    OEM Pulley, Idler - 31180-RAA-A01
    Product Specifications
    • Other Names: Tension Pulley, Tensioner Pulley
    • Item Dimensions: 3.0 x 3.1 x 1.6 inches
    • Item Weight: 0.80 Pounds
    • Fitment Type: Direct Replacement
    • Part Description: Pulley, Idler
    More Info
    $24.24 MSRP: $34.25
    You Save: $10.01 (30%)
  • Dorman OE Solutions Vacuum Pump Pulley - 300-156

    Dorman® OE Solutions Vacuum Pump Pulley

    PartNumber: 300-156
    Product Specifications
    • Belt Type: Serpentine
    • Color: Black
    • Installation Hardware Included: No
    • Installation Instructions Included: No
    • Item Grade: Standard Replacement
    • Material: Steel
    • Mounting Hole Quantity: 1
    • OE Part Number: 4C2Z2L487BA
    • Outside Diameter: 5
    • Package Contents: 1 Vacuum Pump Pulley
    • Pulley Type/Grooves: V-belt
    • UPC: 037495584562
    • Width: 1.4
    • Part Description: OE Solutions Vacuum Pump Pulley
    More Info
    $25.86
  • Gates Drivealign Drive Belt Idler Pulley - 36280

    Gates® Drivealign Drive Belt Idler Pulley

    PartNumber: 36280
    Product Specifications
    • Bearing Bore Inside Diameter 1: 8 mm
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 3.46"
    • Pulley 1 Flanged: No
    • UPC: 072053393880
    • Width: 19 mm
    • Part Description: Drivealign Drive Belt Idler Pulley
    More Info
    $100.03
  • Dayco No Slack Light Duty Idler Tensioner Pulley - 89509

    Dayco® No Slack Light Duty Idler Tensioner Pulley

    PartNumber: 89509
    Product Specifications
    • Bearing Inner Diameter 1: 8.1
    • Bearing Width: 16
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 04 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 88
    • Pulley Width: 19
    • UPC: 036687770820
    • Part Description: No Slack Light Duty Idler Tensioner Pulley
    More Info
    $87.26
  • Four Seasons Drive Belt Idler Pulley - 45041

    Four Seasons® Drive Belt Idler Pulley

    PartNumber: 45041
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 1.000
    • Belt Width MM: 25.400
    • Bore Dia. IN: .375
    • Color: Black
    • Description: Idler / Tensioner Pulley
    • Groove Quantity: Smooth
    • I.D. MM: 7.9375
    • Inside Diameter: 1.00
    • Material: Steel
    • Meets / Exceeds OEM?: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware?: Not Included
    • O.D. MM: 79.375
    • Outside Diameter: 3.125
    • Pulley Type: Back Idler
    • Pulley Width IN: 1.062
    • Pulley Width MM: 27
    • Style: Idler / Tensioner Pulley
    • UPC: 096361450417
    • Width: 27
    • Part Description: Drive Belt Idler Pulley
    More Info
    $38.29
  • SKF Drive Belt Idler Pulley Bearing - ACP36003

    SKF® Drive Belt Idler Pulley Bearing

    PartNumber: ACP36003
    Product Specifications
    • Quantity Per Application: 1
    • UPC: 886931046443
    • Part Description: Drive Belt Idler Pulley Bearing
    More Info
    $52.23
  • VAICO V-Ribbed Belt Guide Pulley - V10-0547

    VAICO® V-Ribbed Belt Guide Pulley

    PartNumber: V10-0547
    Product Specifications
    • Length [mm]: 90.2
    • Material: Polyamid 6.6
    • Packaging Depth [cm]: 5
    • Packaging height [cm]: 9
    • Packaging width [cm]: 9,3
    • Weight [kg]: 0,258
    • Part Description: V-Ribbed Belt Guide Pulley
    More Info
    $33.69
  • Dorman OE Solutions Drive Belt Idler Pulley - 419-725

    Dorman® OE Solutions Drive Belt Idler Pulley

    PartNumber: 419-725
    Product Specifications
    • Belt Type: Serpentine
    • Color: Black
    • Grade Type: Standard
    • Groove Quantity: 0
    • Inside Diameter: 17 mm
    • Material: Plastic
    • Material Thickness: 2.3 mm
    • Maximum Belt Width: 24 mm
    • Mounting Hardware Included: No
    • Mounting Hole Quantity: 1
    • Outside Diameter: 37.6 mm
    • Pulley Bearing Quantity: 1
    • Pulley Bearing Width: 12 mm
    • Pulley Width: 24.5 mm
    • UPC: 889245484468
    • Part Description: OE Solutions Drive Belt Idler Pulley
    More Info
    $11.36
  • Gates Drivealign Drive Belt Idler Pulley - 36272

    Gates® Drivealign Drive Belt Idler Pulley

    PartNumber: 36272
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 3.54"
    • Pulley 1 Flanged: No
    • UPC: 072053393798
    • Width: 30 mm
    • Part Description: Drivealign Drive Belt Idler Pulley
    More Info
    $93.89
  • Dayco No Slack Light Duty Idler Tensioner Pulley - 89508

    Dayco® No Slack Light Duty Idler Tensioner Pulley

    PartNumber: 89508
    Product Specifications
    • Bearing Inner Diameter 1: 12.1
    • Bearing Width: 13
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 04 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 70
    • Pulley Width: 19.05
    • UPC: 036687770875
    • Part Description: No Slack Light Duty Idler Tensioner Pulley
    More Info
    $79.64
  • Four Seasons Drive Belt Idler Assembly - 45059

    Four Seasons® Drive Belt Idler Assembly

    PartNumber: 45059
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 0.6875
    • Belt Width MM: 17.463
    • Color: Black
    • Description: Idlers / Tensioners
    • Groove: 4
    • Material: Plastic
    • Mounting Hole Quantity: 1
    • O.D. MM: 60.325
    • Outside Diameter: 2.375
    • Pulley Width IN: .75
    • Pulley Width MM: 19
    • Style: Idler Assembly
    • UPC: 096361450592
    • Part Description: Drive Belt Idler Assembly
    More Info
    $39.66
  • SKF Drive Belt Idler Pulley - ACP38004

    SKF® Drive Belt Idler Pulley

    PartNumber: ACP38004
    Product Specifications
    • Inner Diameter: 0.3937"
    • Length: 1.4173"
    • Number of Holes: 1
    • Outer Diameter: 2.756"
    • UPC: 085311483780
    • Width: 0.984"
    • Part Description: Drive Belt Idler Pulley
    More Info
    $37.91
  • VAICO Drive Belt Idler Pulley - V30-3119

    VAICO® Drive Belt Idler Pulley

    PartNumber: V30-3119
    Product Specifications
    • Inner diameter [mm]: 17
    • Length [mm]: 63
    • Material: Polyamid 6
    • Outer diameter [mm]: 64
    • Packaging height [cm]: 8,1
    • Packaging width [cm]: 7,2
    • Weight [kg]: 0,1637
    • Width [mm]: 22,5
    • Part Description: Drive Belt Idler Pulley
    More Info
    $29.25
  • OEM (Genuine) Tensioner Assy, Au

    PartNumber: 31170-5A2-A03
    OEM Tensioner Assy, Au - 31170-5A2-A03
    Product Specifications
    • Item Dimensions: 7.7 x 5.9 x 5.2 inches
    • Item Weight: 2.40 Pounds
    • Fitment Type: Direct Replacement
    • Replaces: 31170-5A2-A01, 31170-5A2-A02
    • Part Description: Tensioner Assy, Au
    More Info
    $111.62 MSRP: $157.66
    You Save: $46.04 (30%)
  • Gates Drivealign Lower Drive Belt Idler Pulley - 36318

    Gates® Drivealign Lower Drive Belt Idler Pulley

    PartNumber: 36318
    Product Specifications
    • Bearing Bore Inside Diameter 1: 10.2 mm
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 118 mm
    • Pulley 1 Flanged: No
    • UPC: 072053398809
    • Width: 32 mm
    • Part Description: Drivealign Lower Drive Belt Idler Pulley
    More Info
    $77.03
  • Dayco No Slack Light Duty Idler Tensioner Pulley - 89568

    Dayco® No Slack Light Duty Idler Tensioner Pulley

    PartNumber: 89568
    Product Specifications
    • Bearing Inner Diameter 1: 17
    • Bearing Width: 14
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 07 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 70.2
    • Pulley Width: 30
    • UPC: 036687915979
    • Part Description: No Slack Light Duty Idler Tensioner Pulley
    More Info
    $79.41
  • Four Seasons Drive Belt Idler Pulley - 45040

    Four Seasons® Drive Belt Idler Pulley

    PartNumber: 45040
    Product Specifications
    • Belt Type: Back Idler
    • Belt Width IN: 1.000
    • Belt Width MM: 25.400
    • Bore Dia. IN: .47
    • Color: Black
    • Description: Idler / Tensioner Pulley
    • Groove Quantity: Smooth
    • I.D. MM: 11.906
    • Inside Diameter: 0.46875
    • Material: Steel
    • Meets / Exceeds OEM?: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware?: Not Included
    • O.D. MM: 79.375
    • Outside Diameter: 3.125
    • Pulley Type: Back Idler
    • Pulley Width IN: 1
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361450400
    • Width: 25.4
    • Part Description: Drive Belt Idler Pulley
    More Info
    $35.26
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About Idler Pulley

The idler pulley is essential because it is in charge of routing the timing belt so that it remains in the correct position. There can be one or more pulleys along the timing chain and each can come in different sizes.

Idler pulley function

The main function of the idler pulley is to provide tension and conduct the engine drive belt. The belt wraps around numerous components of the engine. It wraps around components like the power steering pump, alternator, and water pump, so the idler pulley makes sure the entire system runs efficiently.

Common problems with a faulty idler pulley

A faulty idler pulley can cause overheating, stalling, and a decline in tension.