Wärtsilä Sternguard OLS seals
The Wärtsilä Sternguard OLS is an oil lubricated outboard (OLS3-P and OLS4-P) and inboard (OLS2-P) lip sealing solution which can be suited to many applications including merchant, cruise and ferry, offshore, inland water way (IWW) and thrusters.
This seal is a conventional solution for these applications due to its high wear resistant seal rings and liner. The seal rings are made of Viton® rubber, a durable and long-lasting material tested to withstand turbulent weather conditions. The liner provides a running surface for the seal rings and protects the propeller shaft from wear. This solution is provided as a partially split offering but is also available as fully-split, with the possibility to perform retrofits without removing any shaft line components.
The majority of the different executions are suitable for stern tubes, but also can be adapted for thrusters and electric pods. Additionally, we offer the Wärtsilä Bio Seal ring which provides a longer service interval of at least 5 years when used with EALs (Environmentally acceptable lubricants), compared to conventional seal rings which are recommended to be changed every 2.5 years.