VolvoEngine Parts

21587366 Belt Tensioner — Volvo FMX FE Series trucks — FH400

This belt tensioner is an essential part of the engine's accessory drive system, maintaining optimal tension on the serpentine or V-belt to ensure proper operation of components like the alternator, power steering pump, and air conditioning compressor. It is manufactured to meet high OEM quality standards, providing consistent tension and durability compared to a worn tensioner with a weak spring or damaged pulley. Operators may notice a squealing noise from the belt, premature belt wear, or intermittent operation of driven accessories.

Belt Tensioner – Part No 21587366 – 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 TypeBelt Tensioner Assembly
MaterialSteel and reinforced polymer
ApplicationEngine accessory drive system
Service LifeReplace every 100,000 miles or as needed
CompatibilityVolvo FH, FM, FMX, FL, FE Series
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a faulty belt tensioner is often a loud squealing noise from the engine compartment, especially on startup or under load. If ignored, the belt may slip, leading to reduced performance or complete failure of critical accessories like the alternator or power steering. This can result in a loss of electrical power, steering assist, or engine overheating.

Installation Tip

Ensure the mounting bolt is clean and properly torqued to prevent the tensioner from loosening over time. Do not use excessive force when retracting the tensioner arm to install the belt, as this can damage the internal mechanism.

Service Note

Inspect the drive belt and all accessory pulleys for wear or damage whenever the belt tensioner is replaced.