1556333 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta valve seat is a precision cylinder-head valve-seat insert used in the cylinder-head exhaust-valve seating. It is manufactured to the original Volvo Penta dimensions and interface requirements so the valve closes concentrically with the specified contact width and recession. 0.20 mm oversize exhaust valve seat. In service, it provides a 0.20 mm oversize repair seating surface for the exhaust valve. Fitment is controlled by the exact engine or product configuration and serialised parts list; confirm OEM number 1556333 against the installed assembly before ordering.

🚤 Compatibility

Typically suits:

• Volvo Penta TWD1630G
• Volvo Penta TWD1630P
• Volvo Penta TWD1630V
• Volvo Penta TID162AG
• Volvo Penta TID162AGP
• Volvo Penta TD164KAE
• Volvo Penta TAMD162C-C
• Volvo Penta TAD1630G
• Volvo Penta TAD1630GE
• Volvo Penta TAD1630P
• Volvo Penta TAD1631GE
• Volvo Penta TAMD163A-A
• Volvo Penta TAMD163P-A
• Volvo Penta TAMD165A
• Volvo Penta TAMD165C
• Volvo Penta TAD1631G

• Engine Family: TWD, TID, TD, TAMD, TAD

⚙️ Key Features

• OEM Volvo Penta part number 1556333
• Oversize specification: O.S = 0.20 mm
• System group: Engine
• Net weight: 0.066 kg
• Fits TWD1630, TID162, TD164, TAD1630/1631 and TAMD162/163/165 series marine and industrial diesel engines

🔌 Function

The valve seat forms the machined sealing surface in the cylinder head against which the intake or exhaust valve face closes, sealing the combustion chamber during compression and firing. It also conducts heat away from the valve head into the cylinder head for cooling.

⚠️ Common Signs of Failure

• Loss of compression or hard starting on one or more cylinders
• Valve recession or seat wear causing reduced valve clearance over time
• Burnt, pitted or eroded sealing face allowing combustion blow-by
• Rough idle, misfire or loss of power under load
• Loose or dropped seat insert causing severe valve and piston damage

🛠️ 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

• 1556149 related reference

📦 Condition

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