1326517 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta exhaust-valve seat insert for the 16-valve AQ171A and AQ171C cylinder head. The hardened insert is machined into the cylinder head and provides the sealing and heat-transfer surface for exhaust valve 1317792. Four exhaust seats are normally required for the four-cylinder head. Installation requires specialist cylinder-head machining, correct interference fit and final seat cutting to the specified valve angle and installed depth.

🚤 Compatibility

Typically suits:

• Volvo Penta AQ171A
• Volvo Penta AQ171C
• Volvo Penta 251A

• Engine Family: AQ
• HP Range: Approximately 167-171 HP
• Year Range: Approximately late 1980s - early 1990s

⚙️ Key Features

• OEM Volvo Penta part number 1326517
• Standard (Std) size seat, not an oversize service dimension
• System group: Engine
• Net weight 0.013 kg
• Fits AQ171 series and 251A marine engines
• Engine type: Volvo Penta 4-cylinder 16-valve marine petrol engine
• 8 used per assembly

🔌 Function

The valve seat provides the hardened sealing surface in the cylinder head that the intake or exhaust valve closes against, sealing the combustion chamber during compression and firing. It also conducts heat away from the valve head into the cylinder head.

⚠️ Common Signs of Failure

• Loss of compression on one or more cylinders
• Rough idle, misfire or hard starting
• Burnt, pitted or recessed sealing face found during head inspection
• Valve seat recession causing loss of valve clearance
• Exhaust leakage past the valve with noisy or uneven running

🛠️ 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

• 1317792 related exhaust valve
• Volvo Penta AQ171A / AQ171C B234 cylinder-head components

📦 Condition

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