Volvo Penta Idler Pulley 3847482

Volvo Penta 3847482 is a genuine OEM idler pulley used in Volvo Penta front-end accessory drive service. The strongest current public parts-diagram trail places this pulley in the alternator / charging / electric drives assembly, where it appears as schematic object key 7 in a D6-280A-A application. Broader current fitment references consistently associate this same pulley with Volvo Penta D4 and D6 diesel engine families, making it the correct replacement where part number 3847482 is specified in the accessory-belt drive system.

Key Features

• Genuine Volvo Penta OEM idler pulley, part number 3847482.
• Strongest current public diagram support places it in the alternator / charging / electric drives assembly as object key 7.
• Used in the same assembly group as belt tensioner 21344508, generator and power-steering belts, and related alternator bracket hardware.
• Current public fitment references associate it broadly with Volvo Penta D4 and D6 engines.
• One current listing shows approximate weight around 0.68 lb (0.308 kg).

Engine Compatibility

The strongest supportable fitment trail for Volvo Penta 3847482 is with D4 and D6 diesel engine accessory-belt systems. Current fitment references associate it with a wide range of D4 and D6 variants, including many D4-150 through D4-320 applications and D6-280 through D6-480 applications, while the clearest diagram-based placement is in D6-280A-A. Because front-end drive layouts can vary by engine version and accessory configuration, the safest fitment standard is the exact Volvo Penta serial-number-based parts diagram for the engine being serviced.

Serial Number Fitment Notice

Fitment can vary by engine family, front-end accessory layout, and serial-number range. Confirm Volvo Penta part number 3847482 against your engine serial number and the correct Volvo Penta alternator / belt-drive diagram before ordering, especially on D4 and D6 engines where nearby pulleys, belts, and tensioner components can look similar once removed.

When This Part Needs Replacement

Replace this idler pulley when the original pulley shows bearing noise, wobble, rough rotation, belt-tracking issues, visible wear, or damage to the pulley surface. It is also a smart replacement during adjacent belt-drive service if the pulley feels rough by hand or if a failed belt or tensioner has already stressed the front-end drive system.

Installation Notes

Match this pulley to the exact Volvo Penta application before installation. The strongest public reference places it in the alternator / charging / electric drives assembly with the related belt tensioner and accessory-drive hardware, so confirming both the part number and exact diagram position is the safest cross-check before ordering or reassembly. Inspect the belt, tensioner, and adjacent pulleys at the same time to help avoid repeat belt-drive issues after service.

Alternate/Superseded Part Numbers

Current public sources mostly present 3847482 as the active OEM ordering number. One current seller listing also notes 3848896 as a replaced number associated with this pulley family. Use 3847482 as the primary Volvo Penta ordering number for this listing.

Parts Desk Insight

Idler pulleys are easy to overlook during belt service because they often fail quietly before they fail completely. Matching the exact Volvo Penta belt-drive diagram first is usually much safer than comparing pulley size by eye alone, especially on D4 and D6 front-end accessory layouts.

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