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Marine propulsion

The largest folding fin stabiliser systems on the world’s most prestigious cruise liners rely on James Walker seals for reliable operation even in the most extreme conditions.

•    Bearing seals
The standard arrangement for the top bearing seal is for a pair of opposed Walkersele® D6 or Walkersele® D8 profile seals. The inner seal prevents any loss of lubricant from the bearing assembly whilst the outer seal protects the assembly from foreign matter, dirt, etc.

The central lantern ring gives provision for additional grease lubrication to the seals and this can also act as an additional barrier to contamination.

•    Fin & Crux seals
The seal arrangements recommended for both upper and lower crux positions and for the fin itself are similar, consisting of four Walkersele® D7  or Walkersele® D8 profile seals with each pair grease lubricated.

Two alternative configurations are possible, with either both of the outer seals facing externally and the two inners facing internally, or the option of the inner two seals facing each other.


The former arrangement affords maximum protection from seawater ingress and oil loss, whereas the latter can provide early warning of primary seal failure by collecting any leakage through the central leak detection port.