Keep the oil level between the marks on the dipstick. The colour of the lubricating oil in the system says much for the engine’s health…

Four-stroke lubrication system 1 Oil strainer. 2 Oil pump. 3 Pressure release valve. 4 Oil cooler. 5 Oil filter. 6 Oil gallery. 7 Oil feed…

Leaks in raw water systems can cause extensive engine corrosion so they should be cured as soon as possible. Rubber pipes deteriorate with age and…

Leaks If a leak is detected between the raw water and freshwater systems, it is most likely to be in the heat exchanger. The seals…

Heat exchangers are used with indirect cooling systems. The hot engine (fresh) cooling water passes over a stack of pipes containing raw water, which absorbs…

Water forced into the exhaust by following seas can have catastrophic effects. The exhaust tube should be formed into a swan neck before it exits…

This is a chamber to collect any water that remains in the exhaust pipe when the engine is stopped. It also acts as a baffle…

This device stops water syphoning back up the exhaust pipe into the engine. It should be sited so that the outlet pipe or non-return valve…

The most common type of exhaust – and safest in terms of fire risk – is the wet exhaust, where cooling water is injected into…

The thermostat regulates cooling water flow, opening and closing depending on engine heat, allowing more or less water to pass, thus keeping engine temeperature stable.…