Mercury 40-60hp STD Gear Box Repair Kit (812966A12)

Maintain peak performance and prevent costly breakdowns with the Mercury 40-60hp std gear box repair kit (812966A12). This genuine OEM gearcase rebuild kit is engineered for Mercury 40HP, 50HP, and 60HP outboards equipped with the standard gearcase, and includes all the essential components needed to restore proper lower unit function.

Over time, gearcase components like seals, gaskets, and O-rings wear out—leading to water intrusion, gear noise, and eventual failure if left unaddressed. The product includes factory-tested and approved parts that restore your lower unit’s integrity, prevent leaks, and help maintain smooth, reliable shifting and performance.

This all-in-one OEM kit includes:

• Drive shaft oil seals

• Propshaft seals

• Carrier seals

• O-rings

• Gaskets

• Drain/fill screw gaskets

Each component is manufactured to Mercury Marine’s stringent specifications for perfect fit and lasting durability. No aftermarket substitutions—just the same parts used at the factory to assemble your outboard.

This gearbox repair kit is perfect for scheduled maintenance, lower unit rebuilds, or water intrusion repairs. Whether you’re a DIY boater or marine technician, having all required seals and gaskets in one package saves time and ensures you won’t miss a critical part during reassembly.

Compatible with Mercury and Mariner 2-stroke and 4-stroke 40–60HP outboards using the standard gearcase, this kit is not for use with BigFoot or Command Thrust gearcases—be sure to confirm your gearcase type before ordering.

Proper gearcase sealing is vital for protecting your investment. A fresh set of seals from the Mercury 40-60hp std gear box repair kit (812966A12) helps guard against water damage, oil loss, and costly repairs down the line.

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