471640 Reduction Valve | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta reduction valve marked Red, from the Lubricating and Oil System group, weighing 63.5 g and listed for 38 applications across TAD, D, TWD, TID, TD and TADH series engines.

🚤 Compatibility

• Engine Family: TAD, D, TWD, TID, TD, TADH

Full model list at the end of this description.

⚙️ Key Features

• Colour-coded Red
• 63.5 g
• 38 applications across six engine series including TADH
• Lubricating and Oil System group valve

🔌 Function

Limits oil pressure in its circuit by lifting against its spring once the set pressure is reached and bleeding the excess away.

⚠️ Common Signs of Failure

• Oil pressure too high, too low or wandering
• Valve stuck open so pressure never builds
• Valve seized shut, giving pressure spikes
• Debris on the seat so the valve weeps constantly
• Spring collapsed or broken

🛠️ Service Notes

• The colour is the setting, so it is the only reliable identifier: this is the Red valve at 63.5 g, while the Yellow valve 471707 and the White piston cooling valve 471646 both weigh 70.3 g
• Never substitute a different colour to change oil pressure - fit the colour the engine calls for
• Check the seat and the bore in the housing as well as the valve

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D8A2-A MP, D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A4-A MP, D8A1-A MP, D8A3-A MP
• Volvo Penta TD61A, TD61ACE, TD61AG, TD61AP, TD61AW
• Volvo Penta TWD610G, TWD610P, TWD610PB, TWD610V
• Volvo Penta TD610G, TD610M, TD610V
• Volvo Penta TAD570-72VE, TAD570-71VE-B
• Volvo Penta TAD840GE, TAD840-43VE
• Volvo Penta TAD880-82GE, TAD880-84VE
• Volvo Penta TADH880-82GE, TADH880-84VE
• Volvo Penta TD630ME, TD630VE
• Volvo Penta TAD540-42VE
• Volvo Penta TAD550-51VE
• Volvo Penta TAD552VE
• Volvo Penta TAD580-83VE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD853VE
• Volvo Penta TAD870-73VE
• Volvo Penta TID61AG