1378646 Cylinder Head Gasket | Genuine Volvo Penta Part

🔧 Product Description

Cylinder head gasket for Volvo Penta four-cylinder petrol marine engines, forming the sealing joint between the cylinder head and engine block. It seals combustion pressure in each cylinder while keeping the coolant and oil galleries isolated from one another and from the combustion chambers. This gasket supersedes the earlier part numbers 1326785 and 1332644.

🚤 Compatibility

Typically suits:

• Volvo Penta AQ125B
• Volvo Penta AQ131A
• Volvo Penta AQ131B
• Volvo Penta AQ131C
• Volvo Penta AQ131D
• Volvo Penta AQ151A
• Volvo Penta AQ151B
• Volvo Penta AQ151C
• Volvo Penta AQ171A
• Volvo Penta AQ171C
• Volvo Penta AQ145B
• Volvo Penta 230A
• Volvo Penta 230B
• Volvo Penta 250A
• Volvo Penta 250B
• Volvo Penta 251A

• Engine Family: AQ
• HP Range: Approximately 120-171 HP
• Year Range: Approximately 1985 - 1992

⚙️ Key Features

• OEM Volvo Penta part number 1378646
• System group: Engine
• Net weight approximately 0.19 kg
• Supersedes previous part numbers 1326785 and 1332644
• Fits AQ-series four-cylinder petrol engines and 230, 250 and 251 marine engines
• Engine type: Volvo Penta B230 8-valve and B234 16-valve inline 4-cylinder petrol engine
• Also supersedes Volvo part number 1276191

🔌 Function

The cylinder head gasket seals the mating surface between the cylinder head and the engine block, containing combustion pressure within each cylinder. It simultaneously prevents coolant and engine oil from leaking externally or crossing into the combustion chambers.

⚠️ Common Signs of Failure

• Coolant loss with no visible external leak, or white exhaust smoke from coolant entering the combustion chamber
• Milky or emulsified engine oil indicating coolant contamination
• Loss of compression on one or more cylinders, rough running or hard starting
• Exhaust gases pressurising the cooling system, causing bubbling or overflow in the expansion tank
• Visible oil or coolant seepage along the cylinder head to block joint

🛠️ Service Notes

• Establish why the old gasket failed before fitting a new one — overheating, a distorted or cracked head, a corroded block face or a stretched fastener will destroy the new gasket in the same way
• Have the head and block faces checked for flatness and for the surface finish the gasket requires; clean them with plastic or hardwood scrapers and solvent rather than power tools or abrasives, which round the edges of the joint and drop grit into the bores
• Make sure both faces, the bolt holes and the coolant passages are clean and dry, and wipe or blow debris out of the cylinders before the head goes on
• Fit the gasket dry and the right way round, following any orientation marking on it, and use no sealant or jointing compound unless the workshop manual for your engine specifically calls for it
• Use new head bolts wherever the manual requires them — many are designed to stretch and cannot be reused — and tighten in the sequence, stages and angles the manual gives, then carry out any re-tension or valve clearance check it specifies

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 1378646 → Supersedes 1326785

OEM / Related Numbers

• 1332644 earlier number superseded by this part
• 1326785 earlier number superseded by this part

Other-Brand OEM Numbers

• OMC / BRP 0508756
• OMC / BRP: 508756
• Elring: 599.050
• Victor Reinz: 61-25840-10

Aftermarket / Verified Equivalents

• Sierra: 18-2970
• GLM: 36090
• Recmar: REC1378646
• Ajusa: 10021300
• Elwis Royal: 0055543
• RIDEX: 318G0156

📦 Condition

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