VolvoEngine Parts

20487079 Fan Belt Tensioner — Volvo FMX FE Series trucks — FH400

This is a fan belt tensioner assembly for Volvo engines, crucial for maintaining the correct tension on the serpentine belt. It ensures optimal performance of accessories driven by the belt, such as the alternator and water pump, by preventing slippage and premature wear. A failing tensioner often presents as a chirping or squealing noise from the engine bay, especially on startup or under load, and can lead to belt slippage or detachment.

Fan Belt Tensioner – Part No 20487079 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeSerpentine Belt Tensioner
MaterialSteel and rubber
ApplicationEngine accessory drive system
Service LifeReplace every 100,000 miles or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing fan belt tensioner is typically an audible chirping or squealing noise emanating from the engine's accessory drive. If left unaddressed, the tensioner may lose its ability to maintain proper belt tension, leading to intermittent slippage and reduced performance of driven components. Continued operation with a faulty tensioner risks belt detachment, causing a sudden loss of power steering, alternator charging, and engine cooling.

Installation Tip

Ensure the new tensioner is the correct type for your specific engine model and that the mounting bolt is properly seated. Avoid overtightening the tensioner pulley bolt, as this can damage the bearing.

Service Note

Inspect the serpentine belt for any signs of cracking, fraying, or glazing, and check the condition of all accessory pulleys for smooth rotation.