477657 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta valve seat from the Engine group in the standard size, marked Std, weighing 0.034 kg and listed for 24 applications across TWD, TID, TD, TAMD and TAD series engines. Four valve seats appear in this listing, two standard and two oversize, and only the size marking and weight separate them, so measure the head recess and order by number.

🚤 Compatibility

• Engine Family: TWD, TID, TD, TAMD, TAD

Full model list at the end of this description.

⚙️ Key Features

• Standard size, marked Std
• 0.034 kg, the lighter of the two standard seats, with 477659 at 0.045 kg
• 24 applications across TWD, TID, TD, TAMD and TAD engines
• Oversize seats for this head are 477658 and 477667

🔌 Function

Forms the hardened sealing ring the valve closes against in the cylinder head, sealing the combustion chamber and carrying heat out of the valve.

⚠️ Common Signs of Failure

• Compression loss with hard starting and low power on one cylinder
• Hissing back through the inlet or out of the exhaust at cranking
• Seat face pitted, burnt or recessed into the head
• Seat loose or dropped in its recess
• Valve head burnt or the seat width outside specification

🛠️ Service Notes

• Measure the recess in the head and confirm whether standard or oversize is needed, as 477658 and 477667 are the oversize seats
• The published details do not state which of the two standard seats is inlet and which is exhaust, so identify by measurement and order by number
• Seat fitting and cutting is machine shop work, and the valves should be renewed or refaced and the seat width and valve recession checked afterwards

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TAMD74P-A, TAMD74P-B, TAMD74A, TAMD74C-A, TAMD74C-B, TAMD74L-A, TAMD74L-B
• Volvo Penta TD71A, TD71ACE, TD71AW
• Volvo Penta TAD730G, TAD730V
• Volvo Penta TD730ME, TD730VE
• Volvo Penta TWD740GE, TWD740VE
• Volvo Penta TAD740GE
• Volvo Penta TAD741GE
• Volvo Penta TAMD75P-A
• Volvo Penta TD710G
• Volvo Penta TID71A
• Volvo Penta TWD710G
• Volvo Penta TWD730ME
• Volvo Penta TWD731VE