Mercury 8M0000190 Gearcase O-Ring 4.475 x .210

Mercury 8M0000190 Gearcase O-Ring 4.475 x .210

Mercury 8M0000190 is a genuine Mercury gearcase O-ring used in compatible Mercury and MerCruiser gearcase assemblies where this exact part number and size are specified by the factory parts diagram.

Key Features

• Genuine Mercury marine replacement O-ring
• Gearcase sealing component for compatible lower unit assemblies
• Size: 4.475 x .210
• Direct replacement when Mercury part number 8M0000190 is specified
• Helps maintain proper gearcase sealing during service or reassembly

Fitment / Product Details

• Brand: Mercury
• Part Number: 8M0000190
• Product: Gearcase O-Ring
• Size: 4.475 x .210
• System: Gearcase / Lower Unit

Gearcase O-ring fitment depends on engine or drive model, serial number, gearcase configuration, and the specific assembly being serviced. Verify fitment with your Mercury or MerCruiser serial number and factory parts diagram before ordering.

What’s Included

• Mercury 8M0000190 gearcase O-ring

Gearcase seals, bearings, shims, drain plug gaskets, carriers, shafts, tools, and other lower unit parts are not included unless listed separately.

Why You Should Buy

Gearcase sealing parts require exact size and part-number matching. Replacing the O-ring during gearcase service helps support proper sealing and reliable lower unit operation on compatible Mercury marine applications.

Common Applications

Used in Mercury and MerCruiser gearcase assemblies where the factory parts diagram calls for O-ring part number 8M0000190.

FAQ

Is this a complete gearcase seal kit?

No. This listing is for the O-ring only.

Does this replace a drain plug gasket?

No. This is a gearcase O-ring, not a drain plug gasket.

Can Wakeboss help confirm fitment?

Yes. Send your engine or drive model and serial number through Ask a Parts Pro and we can help check the correct gearcase diagram.