Quicksilver Gasket 8M0155369 | Mercury MerCruiser OEM Seal

Quicksilver Gasket — Part #8M0155369

A genuine OEM gasket for Mercury and MerCruiser assemblies. Manufactured to factory specifications for proper sealing, crush, and material compatibility. Using the correct OEM gasket ensures a leak-free seal and prevents premature failure at the mating surface.

Part Details

• Part Number: 8M0155369 (catalog reference: 27-8M0155369)
• Brand: Quicksilver (Mercury OEM)
• Official Product Type: Gasket
• System: Mercury / MerCruiser sealing assembly (verify diagram for exact location)
• Sold: Individually

Compatible Applications

• Mercury and MerCruiser engines and drives where part number 8M0155369 appears in the parts diagram
• The "27-" catalog prefix identifies this as a Mercury-series gasket/seal component
• Verify fitment using your engine or drive serial number and the current Mercury parts diagram before ordering — gasket dimensions and material can vary between assemblies that appear similar

What This Part Does

Gaskets create a pressure- or fluid-tight seal between two mating surfaces. When a gasket is crushed, hardened, torn, or contaminated, it can allow oil, water, or exhaust gases to leak past the joint. Replacing it with an OEM part restores the correct sealing surface and material properties for that specific assembly.

Related Parts & Service Items

• Mercury MerCruiser Quicksilver O-Ring 8M0204645
• Mercury MerCruiser Quicksilver O-Ring 20863
• Mercury MerCruiser Alpha Bell Housing Rubber Gasket 27-8M0204656
• Quicksilver 94996Q2 Bell Housing Gasket Kit — MerCruiser R, MR & Alpha One Gen II
• Mercury MerCruiser Quicksilver Bell Housing Installation Gasket Kit 94996T2

Service Interval

Replace any time the assembly is disassembled for service, when leakage is present at the mating surface, or when the existing gasket shows signs of crushing, hardening, tearing, or contamination. Gaskets should never be reused once compressed.

Technical FAQ

Q: How do I confirm this is the right gasket for my engine?
A: Cross-reference part number 8M0155369 against the Mercury parts diagram for your specific engine model and serial number. The diagram position is the most reliable confirmation for gasket fitment.

Q: Can I reuse this gasket after disassembly?
A: No. Once a gasket has been compressed and torqued, it conforms to the mating surfaces and cannot reliably seal again. Always install a new gasket on reassembly.

Q: Should I replace adjacent seals or O-rings at the same time?
A: Yes, where practical. If the assembly is already apart, replacing nearby seals and O-rings at the same time avoids having to revisit the job if an adjacent seal fails shortly after.

Parts Desk Insights

Best use case: This gasket is the right choice when you need an exact OEM replacement for a specific Mercury or MerCruiser assembly and the part number appears in your engine's parts diagram. OEM gaskets are especially important in high-temperature or high-pressure locations where aftermarket materials may not hold up.

Common issues we see: The most frequent problem with gasket orders is ordering by appearance or general size rather than by part number. Mercury uses different gasket materials and thicknesses across similar-looking assemblies. Always order by the part number shown in your diagram — not by what the old gasket looks like.