{"product_id":"21484834-valve-seat-genuine-volvo-penta","title":"21484834 Valve Seat | Genuine Volvo Penta Part","description":"\u003ch2\u003e\n 🔧 Product Description\n\u003c\/h2\u003e\n\u003cp\u003e\n A hardened exhaust-valve seat used during overhaul of Volvo Penta D12 and TAD12 cylinder heads.\n\u003c\/p\u003e\n\u003ch2\u003e\n ⚙️ Key Features\n\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n  Exhaust-valve position\n \u003c\/li\u003e\n \u003cli\u003e\n  High-temperature alloy construction\n \u003c\/li\u003e\n \u003cli\u003e\n  Interference-fit cylinder-head installation\n \u003c\/li\u003e\n \u003cli\u003e\n  Requires precision seat machining\n \u003c\/li\u003e\n \u003cli\u003e\n  Designed for heavy-duty turbocharged diesel service\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\n 🔌 Function\n\u003c\/h2\u003e\n\u003cp\u003e\n The seat forms the heat-resistant sealing surface for the exhaust valve and transfers combustion heat into the cylinder head.\n\u003c\/p\u003e\n\u003ch2\u003e\n ⚠️ Common Signs of Failure\n\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n  Burnt or pitted seat\n \u003c\/li\u003e\n \u003cli\u003e\n  Valve recession\n \u003c\/li\u003e\n \u003cli\u003e\n  Cracked or displaced seat\n \u003c\/li\u003e\n \u003cli\u003e\n  Exhaust leakage during cylinder-head testing\n \u003c\/li\u003e\n \u003cli\u003e\n  Repeated exhaust-valve failure\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\n 🛠️ Service Notes\n\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n  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\n \u003c\/li\u003e\n \u003cli\u003e\n  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\n \u003c\/li\u003e\n \u003cli\u003e\n  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\n \u003c\/li\u003e\n \u003cli\u003e\n  Use the interference fit, insert size and seat angles specified for your engine rather than any general figure, as they differ between heads\n \u003c\/li\u003e\n \u003cli\u003e\n  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\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\n 🔄 Supersession \u0026amp; Cross Reference\n\u003c\/h2\u003e\n\u003ch3\u003e\n OEM Supersession Chain\n\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003e\n  21484834 → Supersedes 20412798\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n OEM \/ Related Numbers\n\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003e\n  3169366 earlier number superseded by this part\n \u003c\/li\u003e\n \u003cli\u003e\n  20412798 earlier number superseded by this part\n \u003c\/li\u003e\n \u003cli\u003e\n  1547583 related reference\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n Other-Brand OEM Numbers\n\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003e\n  TRW 92-47020\n \u003c\/li\u003e\n \u003cli\u003e\n  TRW 92-47027\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n Aftermarket \/ Verified Equivalents\n\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003e\n  OE Germany 030123D12001\n \u003c\/li\u003e\n \u003cli\u003e\n  SLP: VS-366\n \u003c\/li\u003e\n \u003cli\u003e\n  DT Spare Parts: 2.10591\n \u003c\/li\u003e\n \u003cli\u003e\n  VTP: 6210008\n \u003c\/li\u003e\n \u003cli\u003e\n  LASO: 9805 3216\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\n 📦 Condition\n\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n  Genuine Volvo Penta part\n \u003c\/li\u003e\n \u003cli\u003e\n  Brand new\n \u003c\/li\u003e\n \u003cli\u003e\n  Supplied in original or equivalent packaging\n \u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Volvo Penta","offers":[{"title":"Default Title","offer_id":53384313209124,"sku":"837464M","price":104.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8115\/7924\/files\/original_06f01532-4ac4-4709-b600-d7f617226a84.png?v=1788057717","url":"https:\/\/www.sawleysautoandmarine.com.au\/products\/21484834-valve-seat-genuine-volvo-penta","provider":"Sawley's Auto and Marine","version":"1.0","type":"link"}