VolvoEngine Parts

21280913 — Idler Pulley 21280913 3848896 For Volvo Penta Engine D4-180I 225A D6-330I 300D

This idler pulley is a crucial component of the engine's belt drive system, guiding and tensioning the accessory drive belt to ensure proper operation of components like the alternator and water pump. Manufactured to meet strict OEM specifications, it provides smooth rotation and durability, unlike a worn pulley that may exhibit bearing noise or wobble. Operator symptoms of a failing idler pulley include squealing noises from the engine bay, excessive belt vibration, and potential overheating if the water pump is affected.

Idler Pulley 21280913 3848896 For Volvo Penta Engine D4-180I 225A D6-330I 300D – Part No 21280913 – 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 TypeIdler Pulley
MaterialSteel, Rubber
ApplicationEngine Accessory Drive System
Service LifeReplace based on inspection or noise
CompatibilityVolvo Penta D4, D6 specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A high-pitched squealing or chirping sound from the engine, especially on startup or acceleration, is the primary symptom of a worn idler pulley. If ignored, the pulley bearing can seize, causing the belt to break or slip, leading to a loss of power to essential engine accessories. Continued operation risks damage to the belt and other driven components.

Installation Tip

Ensure the mounting bolt hole is clean and free of rust or debris before installing the new idler pulley. Do not overtighten the mounting bolt, as this can damage the pulley bearing or the engine bracket.

Service Note

Inspect the drive belt and the automatic tensioner for wear and proper function when replacing the idler pulley.