2021 Ford Explorer Drive Belts – Maintain Accessory Power with OEM Precision

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Explorer Drive Belts 2021 – Quiet, Durable, and Built for Long-Term Performance

Your 2021 Ford Explorer depends on its serpentine belt to power critical systems like the alternator, A/C compressor, power steering pump, and water pump. If the belt becomes cracked, stretched, or noisy, it can lead to engine overheating, charging system issues, or loss of steering assist—leaving you stranded at the worst time.

OEM drive belts are designed to Ford’s exact specifications, ensuring precise alignment, ideal tension, and long-lasting reliability. Made from reinforced, heat-resistant materials, these belts deliver quiet operation and consistent power transfer under all driving conditions.

Protect your Explorer’s performance by replacing worn belts with genuine OEM components.

Motorcraft™ Idler Pulley

Part Number: YS-363
Ford Ford
Other Names: Motorcraft™ Accessory Drive Belt Idler Pulley, Motorcraft™ Serpentine Idler Pulley, Kit Tension Pulley
Fits:
  • Ford:
    • Bronco,
    • Edge,
    • Explorer,
    • F-150,
    • Fusion,
    • Police Interceptor Utility,
    • Ranger
  • Lincoln:
    • Aviator,
    • Continental,
    • MKX,
    • MKZ,
    • Nautilus
MSRP $37.27
$23.99

Idler Pulley

Part Number: KX6Z-8678-A
Ford Ford
Notes: Does Not Included Manifolds Or Engine Electrical.
Applications: 2.3L.
Other Names: Tension Pulley, Accessory Drive Belt Idler Pulley, Serpentine Idler Pulley, Engine, Kit Tension Pulley, ys369
Fits:
  • Ford:
    • Bronco,
    • Bronco Sport,
    • Edge,
    • Escape,
    • Explorer,
    • Maverick,
    • Ranger,
    • Transit Connect
  • Lincoln:
    • Corsair,
    • Nautilus
MSRP $45.62
$29.36

Tension Pulley Bolt

Part Number: W503299-S437
Ford Ford
Other Names: Power Steering Pump Mount Bolt, Mount Bracket Lower Bolt, Alternator Bracket Bolt, Belt Tensioner Pulley Bolt, Bolt
Description: 3.3L hev. 2007-12. 6.7L diesel with dual alternators. 3.5L.
Fits:
  • Ford:
    • Edge,
    • Explorer,
    • F-250 Super Duty,
    • F-350 Super Duty,
    • F-450 Super Duty,
    • Fusion,
    • Police Interceptor Utility
  • Lincoln:
    • MKX,
    • MKZ
MSRP $9.25
$5.42

Knock Sensor Bolt

Part Number: W500311-S437
Ford Ford
Other Names: Engine Intake Manifold Bolt, Ignition Knock (Detonation) Sensor Bolt, Intake Manifold Bolt, Bracket Bolt, Belt Tensioner Bolt, Bolt
Replaces: W500311-S1309, W500311-S309
Description: 2.0L dohc. 3.3L. 3.5L with turbo, 2015-16. 3.7L. 1.6L non turbo without ac. 3.5L without turbo. 2017-20. 2021-23, 3.5L.
Fits:
  • Ford:
    • C-Max,
    • EcoSport,
    • Edge,
    • Escape,
    • Expedition,
    • Explorer,
    • F-150,
    • Fiesta,
    • Focus,
    • Fusion,
    • Maverick,
    • Police Interceptor Utility,
    • Police Responder Hybrid,
    • SSV Plug-In Hybrid,
    • Transit Connect,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Continental,
    • MKZ,
    • Navigator
MSRP $12.00
$7.02

Motorcraft™ Idler Pulley

Part Number: YS-369
Ford Ford
Notes: Does Not Included Manifolds Or Engine Electrical.
Applications: 2.3L.
Other Names: Motorcraft™ Accessory Drive Belt Idler Pulley, Motorcraft™ Serpentine Idler Pulley, Motorcraft™ Tension Pulley, Motorcraft™ Engine,...
Fits:
  • Ford:
    • Bronco,
    • Bronco Sport,
    • Edge,
    • Escape,
    • Explorer,
    • Maverick,
    • Ranger,
    • Transit Connect
  • Lincoln:
    • Corsair,
    • Nautilus
MSRP $45.62
$29.36

Upper Hinge Mount Bolt

Part Number: W716291-S439
Ford Ford
Other Names: Upper Hinge Bolt, Lower Hinge Bolt, Lower Hinge, Lower Hinge Upper Bolt, Upper Hinge Upper Bolt, Lower Hinge Mount Bolt, Belt...
Description: M10x26mm. To door. Upper. With spare tire carrier, m10x28mm.
Fits:
  • Ford:
    • Bronco Sport,
    • EcoSport,
    • Edge,
    • Escape,
    • Explorer,
    • Fusion,
    • Maverick,
    • Mustang,
    • Mustang Mach-E,
    • Police Interceptor Utility,
    • Police Responder Hybrid,
    • SSV Plug-In Hybrid,
    • Transit Connect
  • Lincoln:
    • Aviator,
    • Continental,
    • Corsair,
    • MKC,
    • MKX,
    • MKZ,
    • Nautilus
MSRP $5.00
$2.93

Stabilizer Bar Screw

Part Number: W505274-S439
Ford Ford
Notes: Part cannot be reused/reinstalled. Part is not reusable, replace only.
Other Names: Carrier Bolt, Seat Belt Assembly Screw, Carrier Assembly Mount Bolt, Under Cover Screw, Stabilizer Bar Bolt, Suspension Stabilizer...
Description: M10x25mm. Without 4wd. 2wd, 2010-12. Awd, 2010-12. With awd, 2013-16. Awd 2013-19. 2wd 2013-19.
Fits:
  • Ford:
    • Explorer,
    • F-150,
    • Flex,
    • Police Interceptor Sedan,
    • Police Interceptor Utility,
    • Special Service Police Sedan,
    • Taurus,
    • Taurus X
  • Lincoln:
    • Aviator,
    • MKS,
    • MKT,
    • MKX
  • Mercury:
    • Montego
MSRP $5.00
$2.93

Power Steering Pump Mount Bolt

Part Number: W503302-S442
Ford Ford
Other Names: Tensioner Bolt, Water Pump Assembly Upper Bolt, Water Pump Assembly Bolt, Water Pump Assembly Lower Bolt, Water Pump Upper Bolt,...
Replaces: W503302-S437
Fits:
  • Ford:
    • Bronco,
    • Edge,
    • Explorer,
    • F-150,
    • Fusion,
    • Police Interceptor Utility,
    • Ranger,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Aviator,
    • Continental,
    • MKX,
    • MKZ,
    • Nautilus
MSRP $37.00
$21.65

Lower Bushing Nut

Part Number: W520114-S442
Ford Ford
Notes: Included with crossmember. Included with trans c''member. Included with drive shaft assembly. Part cannot be reused/reinstalled.
Other Names: Trailer Hitch Nut, Suspension Stabilizer Bar Link Nut, Seat Belt Assembly Nut, Cross Bar Nut, Axle Beam Nut, Stabilizer Link Nut,...
Replaces: N620483-S301
Description: Exc.Mono Beam Axle. To 12/04/2005. Apron & rails. Rwd. 5.0L, manual trans, without dark horse. 5.2L.
Fits:
  • Ford:
    • E-Transit,
    • Explorer,
    • F-150,
    • F-250 Super Duty,
    • F-350 Super Duty,
    • Mustang,
    • Mustang Mach-E,
    • Police Interceptor Utility,
    • Ranger,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Aviator
MSRP $0.91
$0.53

Genuine Ford Bolt

Part Number: -W503278-S437
Ford Ford
Notes: Included with water pump. Included with thermostat housing.
Other Names: Auxiliary Pump Bolt, Water Pump Bolt, Adapter Bolt, Water Outlet Bolt, Belt Tensioner Bolt, Connector Tube Bolt, Thermostat Outlet...
Description: Sold Individually M6 x 27mm
Fits:
  • Ford:
    • E-350 Super Duty,
    • E-450 Super Duty,
    • Edge,
    • Expedition,
    • Explorer,
    • F-150,
    • F-250 Super Duty,
    • F-350 Super Duty,
    • Flex,
    • Fusion,
    • Mustang,
    • Police Interceptor Sedan,
    • Police Interceptor Utility,
    • Ranger,
    • Taurus,
    • Taurus X,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Continental,
    • MKS,
    • MKT,
    • MKX,
    • MKZ,
    • Navigator
  • Mercury:
    • Sable
MSRP $4.00
$2.34

Upper Center Pillar Trim Retainer Clip

Part Number: W710338-S451
Ford Ford
Notes: Included with guide. Included with bracket. Included with end cover. Included with front trim. Included with front panel. Included with...
Other Names: Lower Center Pillar Trim Retainer, Upper Center Pillar Trim Clip, Front Sill Plate Clip, Lower Center Pillar Trim Clip, Front Trim...
Fits:
  • Ford:
    • Bronco,
    • Bronco Sport,
    • Expedition,
    • Explorer,
    • Maverick,
    • Mustang,
    • Police Interceptor Utility
  • Lincoln:
    • Aviator,
    • Continental,
    • Navigator
MSRP $6.75
$3.95

Drive Motor Battery Compartment Cooling Fan Duct Bolt***sold individually***

Part Number: W505423-S439
Ford Ford
Notes: Included with blind.
Other Names: Window Regulator Bolt, Fender Front Bolt, Fender Lower Bolt, Front Bracket Bolt, Shield Bolt, Run Channel Bolt, Lower Brace Bolt,...
Fits:
  • Ford:
    • Bronco,
    • C-Max,
    • Edge,
    • Escape,
    • Expedition,
    • Explorer,
    • F-150,
    • F-250 Super Duty,
    • F-350 Super Duty,
    • F-450 Super Duty,
    • Flex,
    • Fusion,
    • Mustang Mach-E,
    • Police Interceptor Sedan,
    • Police Interceptor Utility,
    • Police Responder Hybrid,
    • Ranger,
    • Special Service Police Sedan,
    • SSV Plug-In Hybrid,
    • Taurus
  • Lincoln:
    • Aviator,
    • MKC,
    • MKT,
    • MKX,
    • MKZ,
    • Nautilus,
    • Navigator,
    • Zephyr
  • Mercury:
    • Milan
MSRP $4.00
$2.34

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Why Choose OEM Drive Belts for the 2021 Ford Explorer?

OEM Fitment – Designed for factory specifications to ensure precise performance. 

Prevents Failures – Maintains optimal operation and longevity. 

Durable Construction – Made from high-quality, corrosion-resistant materials. 

Efficient Operation – Ensures proper function and system protection. 

Easy Installation – Direct bolt-on replacement with no modifications required.

Compatible Ford Explorer Trims

These OEM serpentine belts are compatible with the following 2021 Ford Explorer engine configurations:

  • 2.3L EcoBoost I4

  • 3.3L V6 Hybrid

  • 3.0L EcoBoost V6 (ST and Platinum)

Belt design and routing may vary depending on engine, accessory configuration, and drivetrain. Always verify compatibility with your VIN or OE part number before ordering.

Signs Your 2021 Explorer Needs a New Drive Belt

🚙 Squealing or chirping during engine start-up 

🚙 Cracks, fraying, or glossy spots on the belt surface 

🚙 Alternator or power steering failure 

🚙 Battery warning light or fluctuating voltage 

🚙 Engine overheating due to water pump disruption

Proactive belt replacement avoids sudden breakdowns and costly accessory damage.

How to Replace Drive Belts on a 2021 Ford Explorer

Serpentine belt replacement is a straightforward process with the proper tools and routing reference.

Tools Needed: 

✔ Serpentine belt tool or breaker bar 

✔ Socket and ratchet set 

✔ Torque wrench 

✔ Flashlight or inspection mirror 

✔ Belt routing diagram (under the hood or in the owner's manual)

Installation Steps:

  1. Check the Routing Diagram – Confirm correct path before removal.

  2. Relieve Belt Tension – Rotate the tensioner and slide the old belt off.

  3. Inspect Pulleys – Check for wobble, cracks, or corrosion.

  4. Install New OEM Belt – Route it exactly as shown in the diagram.

  5. Release the Tensioner – Ensure correct tension and belt seating.

  6. Start Engine & Observe – Confirm smooth, quiet belt operation.

Popular Related Parts for 2021 Explorer

🔹 2021 Explorer Belt Tensioner – Maintains proper belt tension and prevents slippage 

🔹 2021 Explorer Idler Pulley – Replace if noisy or misaligned 

🔹 2021 Explorer Alternator – Driven by the belt; inspect during belt service 

🔹 2021 Explorer A/C Compressor – Check for function and belt-driven performance 

🔹 2021 Explorer Water Pump – Replace if coolant circulation is compromised

Get Your 2021 Explorer Drive Belts Today!

Avoid breakdowns and keep your Explorer’s engine running reliably. OEM serpentine belts are engineered for exact fit, dependable performance, and long-term durability.

🛒 Stay Powered – Shop OEM Drive Belts Now!

FAQs About 2021 Ford Explorer Drive Belts

How long do serpentine belts typically last? Between 100,000–150,000 km, depending on driving conditions and engine load.

What happens if the serpentine belt fails while driving? You may lose power steering, battery charging, A/C, and cooling—resulting in a potential breakdown.

Should I replace the tensioner when I replace the belt? Yes—especially if it’s the original or shows signs of wear like noise or slack.

Can I install the belt myself? Yes—it’s a common DIY job with basic tools and reference to the belt routing diagram.

Why choose OEM belts over aftermarket options? OEM belts are designed specifically for your Explorer’s engine configuration, offering perfect tension, alignment, and lifespan.