TAIL SEAL KIT 26-830749A01

Function and technical context

The tail seal kit is an essential component in the gearbox and propulsion system of Mercury, Mariner and MercCruiser marine engines. These seals act as sealing barriers between the drive shaft and tail housing, preventing salt water from penetrating the interior of the gear system and stern unit. Its correct operation guarantees the integrity of the lubrication fluids and prevents internal corrosion, being critical to maintaining propulsion efficiency and the durability of the powertrain in salt or fresh water environments.

When to replace this part?

Typical symptoms of seal wear include water leaking into the tail housing, presence of milky slurry in the stern unit oil (oil-water emulsion), or visible corrosion on internal components after opening the housing. It is recommended to inspect and consider preventive replacement at each seasonal maintenance check or when any intervention is carried out on the gearbox. Preventive replacement of the complete kit prevents costly progressive damage to the gear system and seawater ingress that could render the entire propulsion unit unusable.

Compatible engines

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers