20509465 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta valve seat is an OEM service component used in the Cylinder-Head Inlet Valve Seat. It is manufactured to the original Volvo Penta dimensional, material and interface requirements for the documented Volvo Penta 11-litre D11/TAD11 diesel application. Technical identification: Replaceable inlet-valve seat insert for the D11 cylinder head; selection is controlled by cylinder-head casting and repair size. In service, it provides the hardened, gas-tight seating surface required for compression and combustion sealing at the specified inlet or exhaust valve. Selection must be confirmed by OEM part number 20509465, the exact model/product number, serial number and installed assembly configuration.

🚤 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
• Volvo Penta D11B3-A MP
• Volvo Penta D11B4-A MP
• Volvo Penta D11A-A
• Volvo Penta D11A-B
• Volvo Penta D11A-C
• Volvo Penta D11A-E
• Volvo Penta D11B2-A MP
• Volvo Penta D11A-C MP
• Volvo Penta D11A-D MP
• Volvo Penta D11A-E MP
• Volvo Penta D11A-C (IPS)
• Volvo Penta D11B1-A MP
• Volvo Penta TAD1170-72VE
• Volvo Penta TAD1150-52VE
• Volvo Penta TAD1140-42VE

• Engine Family: D, TAD

⚙️ Key Features

• OEM part number 20509465
• Technical distinction: Replaceable inlet-valve seat insert for the D11 cylinder head; selection is controlled by cylinder-head casting and repair size
• 12 used per assembly

🔌 Function

Provides the hardened, gas-tight seating surface required for compression and combustion sealing at the specified inlet or exhaust valve. Inspect all matched valve-train parts, lubricate contact surfaces, set valve recession/clearance where applicable and recheck after initial operation.

⚠️ Common Signs of Failure

• Low cylinder compression or leakage during a leak-down test
• Hard starting, misfire or uneven running
• Loss of power, high exhaust temperature or excessive smoke
• Burned, recessed, cracked or pitted valve/seat surfaces
• Incorrect valve clearance or repeat leakage caused by guide/head wear

🛠️ Service Notes

• Seat inserts are an interference fit in the head, so the counterbore has to be clean, round, flat and square before a new seat goes in; normal practice is to chill the insert and warm the head so it drops into place rather than forcing it
• This is machine-shop work — the seat must be cut concentric with the valve guide after installation, so check or renew the guides at the same time and cut the seat angles once the insert is secure
• Inspect the head casting for cracks and for a pounded or spread counterbore before committing to a new seat; a seat that has come loose has usually damaged its pocket
• Use the interference fit, insert size and seat angles specified for your engine rather than any general figure, as they differ between heads
• Check each valve on its finished seat for an even contact band right the way round, and confirm valve position and any permitted recession against the workshop manual for your engine

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21427620 inlet valve
• 20510743 valve-spring retainer washer
• 20510747 valve cotter

Other-Brand OEM Numbers

• TRW Engine Component: 92-47030

Aftermarket / Verified Equivalents

• DT Spare Parts: 2.10849
• Sampa: 030.3117

📦 Condition

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