1556149 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. Standard-size exhaust valve seat; approximately 48.043 mm OD × 37.5 mm ID × 12.4 mm high, 45° seat. In service, it provides the standard-size hardened seating surface for the exhaust valve and transfers valve heat into the head. Fitment is controlled by the exact engine or product configuration and serialised parts list; confirm OEM number 1556149 against the installed assembly before ordering.

🚤 Compatibility

Typically suits:

• Volvo Penta TWD1620G
• 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 TAMD165P
• Volvo Penta TAD1631G

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

⚙️ Key Features

• Genuine Volvo Penta OEM part number 1556149
• Standard (Std) size version - not an oversize service seat
• System group: Engine
• Net weight: 0.05 kg
• Fits TWD1620G/1630, TID162, TD164, TAD1630/1631 and TAMD162/163/165 series marine and industrial diesel engines

🔌 Function

The valve seat provides the hardened, precisely machined sealing surface in the cylinder head against which the valve face closes, sealing the combustion chamber during compression and firing. It also conducts heat from the valve head into the cylinder head coolant passages.

⚠️ Common Signs of Failure

• Loss of compression or hard starting on one or more cylinders
• Burnt, pitted or recessed sealing face causing valve leakage
• Excessive valve recession leading to loss of valve clearance and repeated adjustment
• Cracked or loose seat insert, often accompanied by ticking or knocking from the cylinder head
• Exhaust blow-by, misfire or elevated exhaust temperature on the affected cylinder

🛠️ 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

Other-Brand OEM Numbers

• TRW 92-47041

Aftermarket / Verified Equivalents

• DT Spare Parts 2.10841
• LASO 98053222
• ATP-Diesel VS-149
• SLP VS-149

📦 Condition

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