20430463 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Exhaust Valve Seat - 0.20 mm Oversize - Part Number: 20430463

Genuine Volvo Penta 0.20 mm oversize exhaust-valve seat for selected D12 cylinder heads. It is used when the exhaust-seat bore has been machined to the documented oversize repair dimension and is installed in place of standard exhaust seat 20412798.

⚙️ Key Features

• Exhaust-valve seat in 0.20 mm oversize specification

• Twelve used in the applicable D12 cylinder head

• Alternative to standard exhaust seat 20412798

• Used with exhaust valve 20441486

• Requires professional cylinder-head machining and final seat cutting

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 20430463 - 0.20 mm oversize exhaust-valve seat

OEM / Related Numbers:

• 20412798 - standard exhaust-valve seat

• 20441486 - exhaust valve

• 20459329 - standard inlet seat

• 20459332 - 0.20 mm oversize inlet seat

• 23134313 / 3803666 / 3803924 - related cylinder-head references

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta D12 cylinder-head exhaust-valve systems

Typically suits:

• Engine / equipment models:

• TWD1240VE

• TAD1241VE

• TAD1242VE

• TAD1250VE

• TAD1251VE

• TAD1252VE

• D12D-A MG

• Engine Type: Volvo Penta 12-litre six-cylinder diesel

• Year / Serial Range: Only for cylinder heads machined for the 0.20 mm oversize exhaust-seat repair; confirm casting and serial number

🔌 Function

Provides the hardened sealing and heat-transfer surface for the exhaust valve after an oversize seat repair.

Common signs of failure:

• Loss of compression at the exhaust valve

• Valve-seat recession or cracking

• Poor seat contact after machining

• Burnt exhaust valve

• Seat bore outside standard repair dimension

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging