VolvoEngine Parts

8149855 — Alternator Belt Tensioner 8149855 20966526 For Volvo Engine D12

This is an alternator belt tensioner, a crucial component that maintains the correct tension on the alternator drive belt, ensuring efficient power transfer from the engine to the alternator. Manufactured to strict tolerances, it provides consistent belt pressure, unlike a worn tensioner that may allow the belt to slip or become loose. Operators may notice a squealing noise from the belt area, intermittent battery charging issues, or the alternator warning light illuminating if the tensioner fails.

Alternator Belt Tensioner 8149855 20966526 For Volvo Engine D12 – Part No 8149855 – 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 TypeAlternator Belt Tensioner
MaterialSteel, rubber
ApplicationEngine accessory drive system
Service LifeReplace as needed based on inspection or noise
CompatibilityVolvo D12 Engine
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first noticeable symptom of a failing alternator belt tensioner is often a persistent squealing or chirping noise from the engine's accessory drive. If ignored, the belt may slip excessively, leading to intermittent charging system failure and potential overheating if the water pump is belt-driven. Continued operation risks belt breakage, causing a loss of all engine-driven accessories.

Installation Tip

Before removing the old tensioner, note the direction of spring tension to ensure correct installation of the new unit. Ensure the mounting bolts are tightened securely to the manufacturer's specifications.

Service Note

Always replace the alternator drive belt when replacing the belt tensioner to ensure optimal performance and prevent premature wear of the new component.