Volvo Penta D4 Alternator Pulley 3809128

Volvo Penta 3809128 is a genuine OEM pulley used in select Volvo Penta diesel engine charging-system assemblies. Current parts references place this part in the alternator component group for later D4 diesel applications, where it appears directly with alternator 3840181 and related charging hardware.

Key Features

• Genuine Volvo Penta OEM part number 3809128.
• Identified in current Volvo Penta parts references as a pulley in the alternator assembly.
• Strongest application reference places it with alternator 14V 115A setups.
• Dealer weight references place it at approximately 0.244 kg.

Engine Compatibility

The strongest supportable fitment for 3809128 is within Volvo Penta D4-F series diesel applications. Current parts references tie it to D4-180I-F, D4-225A-F, D4-225I-F, D4-260A-F, D4-260D-F, D4-260I-F, D4-300A-F, D4-300D-F, and D4-300I-F, specifically in the alternator component assembly. Because pulley and charging-system hardware can vary by alternator configuration and serial break, the safest fitment path is to match this pulley to the exact Volvo Penta engine diagram and serial-number-based application before ordering.

Serial Number Fitment Notice

Match Volvo Penta part number 3809128 to your engine serial number and the correct Volvo Penta charging-system or alternator diagram before ordering. Alternator pulleys can vary by alternator type, belt arrangement, and engine version, even within the same D4 family.

When This Part Needs Replacement

This pulley should be replaced when it shows groove wear, wobble, cracking, corrosion, belt-slippage damage, or damage found during alternator service. It is also worth inspecting anytime the alternator or nearby charging-system hardware is already apart. This service guidance is based on the part’s placement in the alternator component assembly.

Installation Notes

Confirm the exact application in the correct Volvo Penta schematic before installation, and compare the removed pulley carefully against the replacement part. Inspect the alternator shaft, belt condition, and adjacent charging-system hardware before reassembly. On alternator-drive parts, exact application matters more than a quick visual match.

Alternate/Superseded Part Numbers

The reviewed sources continue to list 3809128 as the active Volvo Penta OEM number. No clearly supported Volvo Penta superseded replacement number surfaced in the current source set.

Parts Desk Insight

With alternator pulleys like this, the easy mistake is matching only by diameter. Checking the exact alternator assembly first usually saves time, especially when Volvo Penta used different pulley and charging combinations across closely related D4 variants.

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