TAIL SEAL KIT 823547A2

Function and technical context

The tail seal kit is a critical component of the marine transmission system on Mercury engines, responsible for hermetically sealing the area where the drive shaft passes through the engine casing. These seals prevent the entry of water into the transmission system, protecting the gears and lubrication components from contact with sea or fresh water. Its integrity is essential to maintain the correct hydrostatic pressure in the transmission and preserve the useful life of the engine, since any water infiltration causes rust, corrosion and loss of transmission power.

When to replace this part?

Tail seals wear when transmission fluid leaks around the base of the engine, loss of acceleration performance, or water ingress into the housing (identifiable by changes in the color of the transmission oil). It is recommended to inspect and replace preventively every two or three boating seasons, especially after operations in salt water or after the engine has been in prolonged storage. Replacing these seals preventively avoids costly transmission repairs and ensures safe and reliable navigation.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers