984054 Flange Lock Nut | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta flange lock nut weighing 0.011 kg and listed for 11 applications across D-series engines and DPI drives. It combines a locking feature with a flanged bearing face, so it resists loosening and spreads its load without a separate washer.

🚤 Compatibility

Typically suits:

• Volvo Penta D6-300A-G
• Volvo Penta D6-340A-G
• Volvo Penta D6-380A-G
• Volvo Penta DPI-A
• Volvo Penta D6-400A-G
• Volvo Penta D6-440A-G
• Volvo Penta D4-150A-G
• Volvo Penta D4-230A-G
• Volvo Penta D4-270A-G
• Volvo Penta D4-320A-G
• Volvo Penta D4-300A-G

• Engine Family: D, DPI
• HP Range: 150-440 HP

⚙️ Key Features

• 0.011 kg
• Listed for 11 applications across D-series engines and DPI drives
• Locking feature with an integral flange
• Quantity varies by assembly, most commonly four

🔌 Function

Locks onto a stud or bolt and resists loosening under vibration, with the flange spreading the load across the mating face.

⚠️ Common Signs of Failure

• Nut backing off under vibration despite being tightened
• Locking feature spinning freely by hand, showing it is spent
• Flange face bruised or dished so it will not seat flat
• Thread stripped or pulled on removal

🛠️ Service Notes

• Fit a new lock nut rather than reusing one, since the locking feature is spent once it has been run down a thread
• Clean the stud thread before fitting so the torque reading reflects clamp load rather than drag

📦 Condition

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