21780358 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

Precision valve-seat insert manufactured for the assigned Volvo Penta cylinder head. Seat angle, outside diameter, material and installed interference are engine-build controlled.

🚤 Compatibility

• Engine Family: TAD, D, TWD
• Serial Range: SN2016074099-

Full model list at the end of this description.

⚙️ Key Features

• Precision-machined valve-contact angle
• Heat- and wear-resistant material
• Correct cylinder-head interference fit
• Supports valve sealing and heat transfer
• Requires professional machining and installation

🔌 Function

Provides the sealing and heat-transfer surface for an intake or exhaust valve.

⚠️ Common Signs of Failure

• Burned or pitted seating face
• Compression leakage
• Seat recession
• Loose or cracked insert
• Uneven contact pattern after valve lapping

🛠️ 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

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D16C-A MG, D16C-A MH, D16C-B MH, D16C-C MH, D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C-D MH, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
• Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640VE-B, TAD1640-42VE-C
• Volvo Penta TAD1641VE-B, TAD1641GE, TAD1641VE
• Volvo Penta TAD1642VE-B, TAD1642GE, TAD1642VE
• Volvo Penta TAD1650VE-B/51VE, TAD1650GE, TAD1650VE
• Volvo Penta TAD1643VE-B, TAD1643VE
• Volvo Penta TWD1683GE-B, TWD1683VE
• Volvo Penta TAD1651GE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TWD1643GE
• Volvo Penta TWD1644-45GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TWD1663GE
• Volvo Penta TWD1672-1673GE
• Volvo Penta TWD1682-83GE
• Volvo Penta TWD1744GE