Marine engines description, troubleshooting and repairs
Marine propulsion systems are the driving force behind the movement of ships and vessels on the water. They are essential for powering and maneuvering various types of marine vessels, ranging from small boats to large ships. Understanding the different types of marine propulsion systems is crucial for comprehending their principles, advantages, disadvantages, limitations, and applications….
Oil mist detectors are devices that are meant to protect large diesel engines of all applications against serious damage originating from crank-drive bearings or piston components overheating. In case of “Visatron” oil mist detector, the atmosphere of the crankcase compartment is continuously drawn out by means of header pipes sampling system from each…
The Sulzer RT-flex engine is essentially a standard Sulzer RTA slow-speed two-stroke marine diesel engine except that, instead of the usual camshaft and its gear drive, fuel injection pumps, exhaust valve actuator pumps, reversing servomotors, and all their related mechanical control gear, the engine is equipped with a common-rail system for fuel injection and exhaust…
The remote control system for the main engine is intended for use in the wheelhouse, the engine control room (ECR), and on the bridge wings for the purpose of controlling the engine by means of a combined telegraph and manoeuvring lever. The Engine Manoeuvring System (EMS), which is interfaced to the Engine Control System (ECS),…
When the engine is operating under normal conditions, the atmosphere in the crankcase typically has a significant quantity of relatively large oil droplets, of around 150 – 200 microns, floating around in the existing warm environment. The chance of the droplets being ignited by a heat source is extremely rare due to the small surface…
I believe that most of you have noticed that most of the new and large engine models are equipped with temperature monitoring sensors on the cylinder liners. The systems are known under different names and layouts (e.g. Mapex) and are developed by different marine engineering companies (e.g. Wartsila, Kongsberg, etc.) but all serves the same…
I believe that many of you, have heard in the last couple of years about running the main engine at low load or slow steaming due increasing fuel price and lately due more stringent environmental regulations. The 2-stroke engines are designed and optimized for operation in the load range above 60 % CMCR, but is…
Main, crank pin, and crosshead bearings usually wear out very slowly. Wear rates of up to 0.01 mm/10,000 hours are considered acceptable, but under normal conditions, wear rates will be lower. On the other hand, operating conditions that aren’t normal, like dirty lubricating oil, scratches on the journals, or spark erosion (for more information click…
When the engine is running, the air in the crankcase has the same types and amounts of gases as the air around it. However, there is a heavy shower of coarse oil droplets that are thrown all over the crankcase when the engine is running. If there is too much friction between the surfaces that…
A fuel injector valve is a device which receives pressurized fuel as a liquid and sprays it into engine cylinder as a fine mist. It consists of a nozzle and nozzle holder and a body. The nozzle has a series of small orifices around its tip used for atomizing the injected fuel. So, the purpose…