420874 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta valve seat marked Std D, from the Engine group, weighing 0.043 kg and listed for 10 applications across the TAMD, TWD and TD series engines. This is one of the standard-size seats in a four-seat group here.

🚤 Compatibility

Typically suits:

• Volvo Penta TAMD63L-A
• Volvo Penta TWD610V
• Volvo Penta TWD630ME
• Volvo Penta TAMD63P-A
• Volvo Penta TD630ME
• Volvo Penta TD630VE
• Volvo Penta TWD630VE
• Volvo Penta TD640VE
• Volvo Penta TD610M
• Volvo Penta TD610V

• Engine Family: TAMD, TWD, TD

⚙️ Key Features

• Marked Std D — standard size
• 0.043 kg
• 10 applications across the TAMD, TWD and TD series
• 6 used per assembly

🔌 Function

Provides the hardened face in the head that the valve closes onto and seals against.

⚠️ Common Signs of Failure

• Compression down on one cylinder with hard starting
• Popping or spitting back through the inlet or exhaust
• Seat face burnt, pitted or with a channel cut in it
• Seat recessed so the valve sinks into the head
• Seat cracked or loose in its recess

🛠️ Service Notes

• Seat 420875 is the other Std D seat here at 0.041 kg and seats 420876 and 420877 are the oversize pair — the published notes do not say which of each pair is inlet and which exhaust, so order by part number against the engine's parts list
• Oversize seat 420877 shares an identical weight with the standard seat 420875, so weight cannot even separate standard from oversize here
• Renew the valve with the seat and cut the seat to the manual's angle and width

📦 Condition

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