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Dayco OE Fan Belt Tensioner, Volvo D13 / Mack MP8 (89935)

Dayco OE fan belt tensioner for Volvo D13 and Mack MP8 engines (2018+). Maintains correct fan belt tension; replaces tensioners with weak springs or noisy bearings.

  • Brand (legacy)
  • Truck Make
  • Fitment
  • OEM Reference
  • Brand
  • Condition
  • Warranty
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Shipping: 2-3 Business Days

Internal Reference: 89935

  • Same-day shipping before 12PM CT from our Illinois warehouse
  • Part requests and quotes answered within one business hour
  • 30-day returns
  • 1-Year FleetPro Warranty
  • Wholesale and fleet pricing for approved business accounts
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Automatic Belt Tensioner, Specifications & Fitment

The Dayco 89935 is an OE-quality automatic accessory drive belt tensioner for Volvo D13 and Mack MP8 engines. It maintains constant spring tension across the serpentine drive so the belt tracks correctly through the full RPM range. A worn tensioner shows up as belt squeal on cold start, belt flutter or chirp, accelerated belt wear, and a noisy or wobbling pulley. Replacing it restores proper grip on the alternator, water pump, and fan drive.

Specifications
  • Type: Automatic spring-loaded tensioner assembly
  • Belt design: 12-rib serpentine (K-section)
  • Pulley diameter: 74 mm
  • Pulley width: 46.3 mm
  • Rotation: Counter-clockwise
  • Spring: Flat coil spring for reduced bearing load and quieter operation
Where it's used

Volvo D13 and Mack MP8 engines across Volvo VNL, VNM, VNR, VHD and Mack Anthem, Pinnacle, Granite, CHU, CXU and GU series. Installs on the front accessory drive, pivoting against the serpentine belt that turns the alternator, water pump and fan hub.

Cross references: Volvo 21714847 • Volvo 21461221 • Volvo 21417563 • Volvo 20582557 • Volvo 20582558 • Volvo 20860873

Product Details

Truck Make Volvo, Mack
Fitment Volvo D13, Mack MP8 2018+
OEM Reference Volvo 21714847
Brand Dayco
Condition New
Warranty 1-Year FleetPro Warranty