23280920 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta exhaust valve seat weighing 0.020 kg, listed for five applications across D and TAD series engines. The exhaust designation is critical - inlet and exhaust seats differ in material and size. It supersedes 20509467.

🚤 Compatibility

Typically suits:

• Volvo Penta D11C1-A MP
• Volvo Penta D11C3-A MP
• Volvo Penta D11C2-A MP
• Volvo Penta D11C4-A MP
• Volvo Penta TAD1180-83VE

• Engine Family: D, TAD

⚙️ Key Features

• Exhaust valve seat
• 0.020 kg
• Supersedes 20509467
• Listed for five applications across D and TAD series engines
• Inlet and exhaust seats differ in material and size

🔌 Function

Forms the hard ring in the cylinder head that the exhaust valve closes onto, sealing the combustion chamber and carrying heat out of the valve head.

⚠️ Common Signs of Failure

• Compression down on one cylinder, with hard starting and a misfire
• Exhaust valve found burnt or receded into the head
• Valve clearances closing up between services
• Seat cracked, pitted or sunk into the head
• Seat loose in its bore, or dropped, with impact damage in the chamber

🛠️ Service Notes

• Seat renewal is a machine shop job - the bore must be measured and the new seat cut to the correct angle after fitting
• Renew the valve, guide and stem seal with the seat, then reset the clearances
• Order the exhaust seat specifically; the inlet seat is a different part

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 23280920 → Supersedes 20509467

OEM / Related Numbers

• 20509467 earlier number superseded by this part

📦 Condition

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