Wärtsilä Stern Tube Seals (Oil Lubricated)

The technologies behind all Wärtsilä oil lubricated sealing products are a result of many years of experience and development.

Maximising longevity while facilitating servicing and maintaining exemplary sealing performance has been our fundamental philosophy.

Within the oil lubricated seal product range, there are both face and lip seal variants to deal with a wide variety of operating profiles including abrasive waters and compliance to anti-pollution requirements.

Following the acquisitions of John Crane - Lips, Japan Marine Technologies and Cedervall Businesses as well as the acquisitions of the brand names DSS - Deep Sea Seals, Lips and JMT - Japan Marine Technologies by Wärtsilä, the products have been renamed.

    Anti-Pollution

    LONG LIFE SEAL RING FOR USE WITH EALs

    Wärtsilä Bio Seal Ring with EALs (Environmentally Acceptable Lubricants)

    The Wärtsilä Bio Seal Ring has been developed to meet the latest environmental regulations regarding the use of biodegradable oils / EAL’s in stern tubes (for fixed pitch propeller only at this time).

    It allows customers to upgrade from conventional seal rings which are currently recommended to be changed at 2.5 year intervals when used with biodegradable oils

    The Wärtsilä Bio Seal Ring properties allow for long life with service intervals of at least 5 years.

    • For use with Ester type biodegradable oils.
    • New build and retrofit markets (bonded around the shaft using current techniques)

    Available for all Wärtsilä conventional seal ring sizes

    Wärtsilä Stern Tube Seals  Bio Seal ring

    ANTI-POLLUTION SEALS, MERCHANT APPLICATIONS

    Wärtsilä Airguard - OLS3A-P & OLS4A-P

    Formerly known as JMT (Japan Marine Technologies) Airguard 3AS & 4AS, oil lubricated outboard stern tube lip type seals consist of the following key components: casing set, high wear resistant seal rings and liner. The seal rings are made of Viton® rubber. The liner provides a running surface for the seal rings and protects the propeller shaft from wear.

    Although as standard, they are partially split solutions, they are also available as fully split providing the possibility to remove and replace without disturbing any components in the shaftline.

    The Wärtsilä Airguard range, OLS3A-P & OLS4A-P, contains an automatic air pressure control seal systems with air control unit, drain collection unit, oil tank and pump.

    Shaft sizes ø286 to ø1172 mm
    Serviceability Partially split and fully split options
    Internal lubricant Oil and air
    Max, draft pressure 1.85 bar
    Optional extras In water survey wear down gauge, net protection ring, spacer ring, zinc anodes, tungsten coating for the liner, adaptable interfacing
    Wärtsilä Stern Tube Seals - OLS3A, OLS4A-P
    Commercial

    STANDARD SEALS, COMMERCIAL APPLICATIONS

    Wärtsilä Sternguard - OLS2-P, OLS3P & OLS4-P

    Formerly known as JMT (Japan Marine Technologies) Sternguard MK2, MK2M & 4BL, oil lubricated outboard, OLS3-P & OLS4-P, and inboard, OLS2-P, stern tube lip type seals consist of the following key components: casing set, high wear resistant seal rings and liner.

    The seal rings are made of Viton® rubber. The liner provides a running surface for the seal rings and protects the propeller shaft from wear.

    Although as standard, they are partially split cost efficient solutions, they are also available in a fully split option providing the possibility to perform retrofits without removing any components in the shaft line.

    Shaft sizes ø80 to ø1172 mm (OLS2-P & OLS3-P)
    ø286 to ø1172 mm (OLS4-P)
    Serviceability Partially and fully split options
    Internal lubricant Oil
    Max, draft pressure 2.0 bar
    Optional extras In water survey wear down gauge, net protection ring, spacer ring, zinc anodes, tungsten coating for the liner, adaptable interfacing
    Wärtsilä Stern Tube Seals - OLS2, OLS3, OLS4
    Inland Waterways

    STANDARD SEALS, INLAND WATERWAYS & COASTAL APPLICATIONS

    Wärtsilä Sternguard - OFS1R-N, OFS1R-N-X & OFS1R-N-Z

    Formerly known as DSS (Deep Sea Seals) Sternguard Manebar EJ & EK, oil lubricated outboard, OFS1 R-N, and inboard, OFS1R-N-Z, stem tube face type seals are designed for robust and reliable service in small to medium sized vessels such as trawlers, coasters, dredgers, tugs and offshore supply vessels.
    OFS1R-N-X, high abrasion resistance seals

    Shaft sizes ø50 to ø330 mm
    Serviceability Non-split
    Internal lubricant Oil
    Max, draft pressure 0.8 bar
    Wärtsilä Stern Tube Seals -OFS1R-N-Z
    Offshore

    STANDARD SEALS, OFFSHORE APPLICATIONS

    Wärtsilä Sternguard - OFS1H-F, OSF1H-N, OFS1HW-F & OFS1HW-N

    Formerly known as Cedervall, SeaQual range, SQA, SQL, SQF & MDL, oil lubricated outboard, OFS1H-F & OFS1H-N, and inboard, OFS1HW-F & OFS1HW-N, stem tube seals are designed to offer a durable solution suitable for the harsh working conditions of propeller shaft seals. As standard, they are fully split providing the possibility to perform retrofits and overhauls without removing the shaft line or propeller. Non-split cost efficient solutions are also available.

    Shaft sizes ø66 to ø1029 mm (depending on application)
    Serviceability Non-split, partially and fully split options
    Internal lubricant Oil
    Max, draft pressure 2.5 bar
    Optional extras In water survey wear down gauge, adaptable interfacing,
    Inner Rope Guard for added protection
    Wärtsilä Stern Tube Seals -OFS1H-F, OSF1H-N, OFS1HW-F, OFS1HW
    Abrasion Resistant

    ABRASION RESISTANT & ANTI-POLLUTION SEALS

    Wärtsilä Sandguard - OLS3AW-P, OLS4AW-P, OLS3W-P & OLS4W-P

    Formerly known as JMT (Japan Marine Technologies) Sandquard 3AS-D, 4AS-D MK2-D & 4BL-D, the Wärtsilä Sandguard oil lubricated outboard stern tube lip type seals are specially designed for dirty water conditions. They consist of the following key components: casing set, high wear resistant seal rings and liner. The seal rings are made of Viton® rubber. The liner provides a running surface for the seal rings and protects the propeller shaft from wear. Although as standard, they are partially split solutions, they are also available as fully split providing the possibility to remove and replace without disturbing any components in the shaft line.

    Fresh water is supplied to the seawater chamber to ensure all sea particles/debris is cleared from the dynamic seal ring interfaces, providing protection & longevity of the seal.

    OLS3W-P & OLS4W-P, high abrasion resistance, inland waterways & coastal applications

    OLS3AW-P & OLS4AW-P, high abrasion resistance & anti-pollution, dredgers & oceangoing applications

    Shaft sizes ø286 to ø1172 mm
    Serviceability Partially split and fully split options
    Internal lubricant Oil and water (and air)
    Max, draft pressure 1.85 bar to 2.0 bar (depending on seal system)
    Optional extras In water survey wear down gauge, net protection ring, spacer ring, zinc anodes, tungsten coating for the liner, adaptable interfacing
    Wärtsilä Stern Tube Seals -OLS3W, OLS4W, OLS3AW, OLS4AW

    Wärtsilä Oceanguard - OFS3H-P

    Formerly known as DSS (Deep Sea Seals) Oceanguard, oil lubricated outboard face type seal which offers anti-pollution and abrasion resistance capabilities to cruise, ferry & offshore applications.

    The Wärtsilä Oceanguard product range uses a unique design with a face type seal in the sea water and lip seals to operate in the stem tube oil.

    The standard seal, OFS3H-P, contains a void space between the water and oil interfaces to provide a separation that enables monitor and draining. This prevents any contamination of the oil system with sea water and vice versa.

    Shaft sizes ø400 to ø760 mm
    Serviceability Partially split
    Internal lubricant Oil
    Max, draft pressure 1.0 bar
    Optional extras Bearing wear down gauge, rope protection assembly, deeper draft