21680904 Pulley | Genuine Volvo Penta Part

🔧 Product Description

Drive pulley used on Volvo Penta D8 coolant-pump assemblies. It transfers belt rotation to the coolant pump and maintains the correct pulley offset and speed for the engine cooling system.

🚤 Compatibility

Typically suits:

• Volvo Penta D8A5-A MH
• Volvo Penta D8A6-A MH
• Volvo Penta D8A5-A MG
• Volvo Penta D8A6-A MG
• Volvo Penta D8A4-A MP
• Volvo Penta D8A1-A MP
• Volvo Penta D8A2-A MP
• Volvo Penta D8A3-A MP

• Engine Family: D

⚙️ Key Features

• Genuine Volvo Penta machined rotating component
• Factory tooth/groove geometry
• Correct diameter, offset and mounting interface
• Designed for the original bearing or belt load
• Serial-specific ratio or application
• Engine type: 7.7-litre inline-six turbocharged diesel

🔌 Function

Transfers rotational force while maintaining the designed speed ratio, alignment or engagement.

⚠️ Common Signs of Failure

• Tooth or groove damage
• Excessive backlash or run-out
• Fretting at the mounting interface
• Misalignment or uneven wear

🛠️ Service Notes

• Inspect the belt running surfaces before fitting — a pulley with glazed, scored, pitted or rust-roughened grooves will chew through a new belt in very little running time
• Check that the pulley runs true and that its bearing or bush turns smoothly with no roughness or side play; fit a new belt whenever a pulley is changed
• Confirm that every pulley in the drive lies in the same plane and that the belt profile matches each groove — misalignment shows up as belt dust, squeal or a worn belt edge and will destroy a new belt quickly
• Fit onto a clean, dry, burr-free shaft or hub face and tighten the retaining fasteners in the sequence and to the figures given in the workshop manual for your engine
• Turn the engine over by hand before starting to confirm the belt is fully seated in every groove and that nothing fouls, then recheck belt tension after the first running period

🔄 Supersession & Cross Reference

Other-Brand OEM Numbers

• VOE21680904

Aftermarket / Verified Equivalents

• Coolant pumps: 3801728, 21931911, 3801749 and 23033741
• Pump housings: 22329334 and 23002903
• Associated gasket: 979099

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging