Wärtsilä Stern Tube Seals (Oil Lubricated)

Most commercial stern tubes are of the oil lubricated type and require a robust and reliable sealing solution

The technologies behind all Wartsila oil lubricated sealing products are a result of many years of experience and development. Maximising longevity while facilating servicing and maintaining exemplary sealing performance has been our fundamental philosophy. Within the oil lubricated seal product range, there are both face and lipe 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 are renamed respectively:

DSS Sternguard Manebar EJ & EK -> Wärtsilä Sternguard OFS1R-N OFS1R-N-X & OFS1R-N-Z
DSS Oceanguard -> Wärtsilä Oceanguard OFS3H-P
JMT Sternguard MK2, MK2M & 4BL -> Wärtsilä Sternguard OLS2-P, OLS3P & OLS4-P
JMT Airguard 3AS & 4AS -> Wärtsilä Airguard OLS3A-P & OLS4A-P
JMT Sandquard 3AS-D, 4AS-D MK2-D & 4BL-D -> Wärtsilä Sandquard OLS3AW-P, OLS4AW-P, OLS3W-P & OLS4W-P
Cedervall, SeaQual range, SQA, SQL, SQF & MDL -> Wärtsilä Sternguard OFS1H-F, OSF1H-N, OFS1HW-F & OFS1HW-N

STANDARD SEALS, INLAND WATERWAYS & COASTAL APPLICATIONS
OFS1R-N, OFS1R-N-X & OFS1R-N-Z
Wärtsilä Sternguard	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

STANDARD SEALS, COMMERCIAL APPLICATIONS
OLS2-P, OLS3P & OLS4-P
Wärtsilä Sternguard 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 forthe liner, adaptable interfacing

STANDARD SEALS, OFFSHORE APPLICATIONS
OFS1H-F, OSF1H-N, OFS1HW-F & OFS1HW-N
Wärtsilä Sternguard 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

ANTI-POLLUTION SEALS, MERCHANT APPLICATIONS
OLS3A-P & OLS4A-P
Wärtsilä Airguard	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

ABRASION RESISTANT & ANTI-POLLUTION SEALS
OLS3AW-P, OLS4AW-P, OLS3W-P & OLS4W-P

Wärtsilä Sandguard 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
OFS3H-P
Wärtsilä 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