Z Series

Parts suitable for engines: Z40, ZA40 and ZA40S are available in full scope directly from our stock. We serve Ships Propultion Engines and Power Plants. 6ZAL40S, 8ZAL40, 8ZAL40S, 9ZAL40S, 12ZAV40S, 16ZAV40S.

Having the necessary know-how inherited from ZUT Zgoda Świętochłowice, we are able to satisfy each requisition and we are prepared to solve each technical problem regarding Z-type engines.

We cooperate closely with major European OEM makers, ensuring that all the parts delivered by us are manufactured based on the original drawings and present the highest quality.

Certificates are provided for all major or crucial parts.

We are unable to deliver spare parts to every diesel engine there is. We have chosen to specialize in certain types. This is why we are that good in what we do.


The Sulzer Z-type engine family was founded by the ZH40 medium-speed two-stroke engine that was designed early in the 1960s. It was then applied in a series of Arctic icebreakers, ferries and cruise ships. From the beginning, these engines were equipped with the unique Sulzer rotating piston. Over the years, this piston has proved to provide the highest safety under severe operating conditions. It was then succeeded by the Z40 four-stroke version, ZA40 after that and finally ZA40S which was the last model of the Sulzer 4-stroke engines before Sulzer being overtaken by Wartsila.

Sulzer Z-type engine is generally charactarized by these two important features:

  • Rotating Piston
  • Bore-cooled combustion space
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