This set includes two belt tensioners (21714847 and 20582558) crucial for maintaining the correct tension on the Volvo D13 engine's accessory drive belts. They utilize a spring-loaded mechanism to automatically compensate for belt stretch and vibration, ensuring optimal performance of components like the alternator and air conditioning. Worn tensioners can cause belts to slip, leading to undercharging of the battery, overheating, or loss of power steering.
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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.
A worn belt tensioner will often manifest as a persistent squealing or chirping noise from the engine's accessory drive, especially on startup or under load. If ignored, the belt may slip intermittently, leading to reduced charging system output or overheating. A failed tensioner can allow the belt to completely detach, disabling critical engine functions.
Ensure the new tensioners are correctly aligned with the pulleys; misalignment can cause premature wear on both the tensioner and the belt. Do not use excessive force to retract the tensioner arm, as this can damage the internal spring mechanism.
Inspect all accessory drive pulleys for damage or wear, and check the condition of the drive belts for cracks or glazing when replacing the tensioners.