| Allen | Cummins | MAN | Stork |
| Alpha-Diesel | Daihatsu | Mirrlees | Sulzer |
| B&W | DEMP | Perkins | Uljanik |
| Bazan | Deutz | Pielstick | Volvo Penta |
| Bergen | Dorman | Ruston | Wartsila Vasa |
| Blackstone | Gardner | Scania | Yanmar |
| British Polar | Kvaerner | Skandiaverken | |
| Caterpillar | Lister Petter | SKV |
