Mercury Outboard Lower Units

Start with the engine serial/model number and current gearcase or OEM number. Then verify engine family, year, shaft length, ratio, rotation and any application-specific identifiers.

No, Mercury engines with the same horsepower can use different gearcases based on engine family, year, shaft, ratio, rotation and internal configuration.

Use the engine and current gearcase identification information, supplier application data or the appropriate service documentation. Match the original application unless a qualified technician confirms otherwise.

Confirm the existing engine and gearcase specification rather than estimating from boat size. Shaft designations must match the application shown on the selected product.

They are designed for different propeller-rotation requirements. Verify the current unit and engine documentation because engine position alone does not prove the required rotation.

No, Verado gearcases can differ by generation, bullet diameter, shaft, ratio and rotation. A 4.8-inch and 5.44-inch unit should not be selected by horsepower alone.

A new unit is sold in new condition, while a remanufactured unit has been professionally restored from a serviceable core. Warranty, testing, included parts and core requirements vary by listing.

Some do and some do not. Check the exact product’s core deposit, return window, acceptable-core condition and freight instructions before purchase.

Possible signs include lubricant leaks, milky or metallic gear lubricant, abnormal noise, shifting problems or loss of propeller drive. Have the unit diagnosed before deciding whether repair or replacement is required.

No universal warranty should be assumed. Coverage depends on manufacturer, supplier, condition and product, so read the warranty attached to the selected listing.