VolvoEngine Parts

3979980 — Belt Tensioner 3979980 For Volvo Engine D13 Bus B7R B9L Truck Fh12

This belt tensioner is a crucial component in the engine's accessory drive system, maintaining optimal tension on the drive belt to ensure proper operation of components like the alternator, power steering pump, and air conditioning compressor. It is built to OEM specifications, providing consistent tension and long service life, unlike worn tensioners with weak springs or damaged bearings that cause belt slippage. Operators may notice a squealing noise from the belt area, premature belt wear, or intermittent failure of accessories driven by the belt when this tensioner is faulty.

Belt Tensioner 3979980 For Volvo Engine D13 Bus B7R B9L Truck Fh12 – Part No 3979980 – 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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Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

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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 high-strength spring
ApplicationEngine accessory drive belt system
Service LifeReplace every 100,000 miles or when signs of wear appear
CompatibilityVolvo D13 Engine, Bus B7R, B9L, Truck FH12
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing belt tensioner typically manifests as a persistent squealing noise from the engine bay, especially during startup or acceleration, and visible belt oscillation. If the tensioner fails completely, the drive belt can slip or break, leading to a loss of power to critical accessories like the alternator and water pump. This can result in rapid engine overheating and electrical system failure.

Installation Tip

Ensure the mounting bolt is torqued to the manufacturer's specification to prevent premature failure or loosening. Do not use excessive force to retract the tensioner arm when installing the new belt.

Service Note

Always inspect the drive belt and all accessory pulleys for wear or damage when replacing the belt tensioner.