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    Wärtsilä Enviroguard MB and M4

    Reliability in extreme weather conditions

Wärtsilä Enviroguard M4 seal
Wärtsilä Enviroguard MB inboard seal

Wärtsilä Enviroguard MB and M4 seals

Wärtsilä Enviroguard MB and M4 (formerly Wärtsilä Iceguard) is a closed water lubricated seal for inboard and outboard applications designed specifically for icebreakers, which can experience shock and high shaft movement.

Reliability in extreme weather conditions

The Wärtsilä Enviroguard MB and M4 (formerly Iceguard) are specifically fitted to military and commercial vessels, including container vessels and ice breakers. The unique omega shaped spring design absorbs all axial and radial movements from the shaft, ensuring the face carrier remains in contact with the seat assembly.

Wärtsilä Enviroguard MB is an inboard, closed water lubricated “omega” bellows, face type seal assembly. The Wärtsilä Enviroguard M4 is an outboard, closed water lubricated stern tube seal.

The seals features a rotating seat assembly and a stationary face carrier. Interface contact is maintained by spring pressure from the flexible bellows assembly. Through this seal design, the seal is able to accommodate large axial and radial movements, as well as high frequency vibration. The seal assembly is partially split, allowing wearing components to be replaced without removing the shaft. Emergency sealing features, such as a packing gland is also available. 

Wärtsilä Enviroguard M4 outboard Wärtsilä Enviroguard MB inboard

How can we help?

Contact our 24/7 customer support at sls247@wartsila.com for assistance with solutions related to the shaft line.

To enable prompt response, please indicate the Equipment Serial Number or the name of the vessel. Equipment Serial Number is taken from the equipment nameplate and includes all letters and numbers as given on the equipment nameplate.

For all other enquiries, please fill in the online form. Fields indicated with an asterisk (*) are required. We aim to respond within 1-2 business days depending on the scope of your enquiry.

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