463739 Valve Spring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta valve spring from the Engine group, weighing 0.061 kg and listed for 19 applications across AQ and BB series engines. Do not confuse it with the plain spring 463389 at 0.039 kg, which covers the same 19 applications.

🚤 Compatibility

Typically suits:

• Volvo Penta AQ120B
• Volvo Penta AQ125B
• Volvo Penta AQ125A
• Volvo Penta AQ131A
• Volvo Penta AQ131B
• Volvo Penta AQ131C
• Volvo Penta AQ131D
• Volvo Penta AQ151A
• Volvo Penta AQ151B
• Volvo Penta AQ151C
• Volvo Penta AQ145B
• Volvo Penta 230A
• Volvo Penta 230B
• Volvo Penta 250A
• Volvo Penta 250B
• Volvo Penta BB140A
• Volvo Penta BB145A
• Volvo Penta AQ145A
• Volvo Penta AQ140A

• Engine Family: AQ, BB

⚙️ Key Features

• 0.061 kg
• 19 applications across AQ and BB series engines
• Distinct from spring 463389, which is lighter at 0.039 kg
• Engine group
• 8 used per assembly

🔌 Function

Closes the valve and holds it hard against its seat, keeping the valve gear in contact with the cam through the whole cycle.

⚠️ Common Signs of Failure

• Valve gear noisy, or valve float and misfiring at higher revs
• Spring shorter than new when measured against a fresh one
• Coil cracked or broken, often at the end turn
• Rubbing marks or bright spots along the coils
• Compression falling on one cylinder as the valve fails to seat

🛠️ Service Notes

• Renew the springs as a full set across the head so the valve gear is loaded evenly
• Check the spring washers and retainers for bedding-in at the same time
• Compare free length against a new spring rather than judging by eye

📦 Condition

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