VolvoEngine Parts

20827109 — V-Ribbed Belt Tensioner 20827109 21576596 For Volvo Bus 7700 7900 8300 8500 8900 B9

This is a V-ribbed belt tensioner, critical for maintaining proper tension on the engine's serpentine belt, which drives accessories like the alternator and water pump. It is constructed from high-grade steel and bearings to ensure smooth operation and long service life, unlike a worn tensioner that can cause belt slippage or noise. Operators may hear a persistent chirping or squealing noise from the engine bay, or observe excessive belt vibration.

V-Ribbed Belt Tensioner 20827109 21576596 For Volvo Bus 7700 7900 8300 8500 8900 B9 – Part No 20827109 – Volvo Spare Part
Part Specifications
BrandVolvo
CategorySpare 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

Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.

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, rubber
ApplicationEngine accessory drive system
Service LifeReplace every 100,000 miles or when noisy
Compatibility21576596
ConditionNew — OEM specification aftermarket

Failure Symptoms

The most common symptom is a high-pitched squealing or chirping noise from the engine compartment, especially on startup or acceleration. If ignored, the belt can slip, leading to loss of power to critical engine accessories like the alternator or water pump.

Installation Tip

Before installing, ensure the mounting surfaces are clean and free of corrosion. Always release tension slowly to avoid damaging the new tensioner's spring mechanism.

Service Note

Inspect the serpentine belt for wear, cracks, or glazing, and check the condition of the accessory pulleys.