27853702005 Mercury MerCruiser 278M0214960 Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Pump / Gearcase Gasket - Part Number: 27-8M0214960

Genuine Quicksilver gasket used in Mercury / Mariner lower-unit water pump and gearcase assemblies. This gasket supersedes 27-853702005 and is used on 75HP to 125HP DFI / OptiMax and related gearcase applications where the lower unit diagram specifies 27-8M0214960.

⚙️ Key Features

• Genuine Quicksilver OEM gasket

• Correct current Mercury part number 27-8M0214960

• Supersedes 27-853702005

• Used in lower-unit water pump / gearcase sealing applications

• Recommended replacement during pump or lower-unit service

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 27-8M0214960 → Supersedes 27-853702005

• 27-853702005 earlier OEM gasket reference

OEM / Related Numbers:

• 27-8M0214960

• 8M0214960

• 278M0214960

• 27-853702005

• 853702005

• 27853702005

• Lower-unit gasket

• Gearcase gasket

• Water pump gasket

Aftermarket / Verified Equivalents:

• Aftermarket water pump / gearcase gasket equivalents where matched to 27-853702005 / 27-8M0214960

• Use exact gasket shape match to avoid blocking or opening incorrect cooling passages

🚤 Compatibility

Commonly used on:

• Mercury / Mariner 1.5L DFI / OptiMax gearcase water pump assemblies

• Mercury 75HP to 125HP lower-unit service

• Gear housing gasket replacement during pump or lower-unit work

Typically suits:

• Engine models:

• Mercury 75 DFI 1.5L 3-cylinder - serial 0T980000 to 1B226999

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736884

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 80 Jet DFI 1.5L - serial 1B586067 to 1B736884

• Mercury 80 Jet DFI 1.5L - serial 1B736885 and up

• Mercury 90 DFI 1.5L - serial 0T801000 to 1B226999

• Mercury 90 DFI 1.5L - serial 1B227000 to 1B417701

• Mercury 90 DFI 1.5L - serial 1B417702 to 1B736884

• Mercury 90 DFI 1.5L - serial 1B736885 and up

• Mercury 115 DFI 1.5L - serial 0T801000 to 1B226999

• Mercury 115 DFI 1.5L - serial 1B227000 to 1B417701

• Mercury 115 DFI 1.5L - serial 1B417702 to 1B736884

• Mercury 115 DFI 1.5L - serial 1B736885 and up

• Mercury 115 Pro XS 1.5L - serial 1B751825 and up

• Mercury 125 DFI 1.5L - serial 1B736885 and up

• HP Range: 75HP - 125HP where specified

• Engine Type: Mercury / Mariner 1.5L DFI / OptiMax outboard

• System Type: Water pump / gearcase gasket

🔌 Function

The gasket seals the water pump or gearcase joint to maintain cooling-water pressure and prevent leakage at the lower-unit mating surface.

Common signs of failure:

• Weak cooling water output

• Overheating after impeller service

• Gasket torn during disassembly

• Water pump not priming correctly

• Cooling water leakage around pump base

• Replacement required during lower-unit rebuild

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging