Exhausts and mounting exhausts 7

a) An engine correctly installed in accordance with this handbook will meet the emission requirements of the

RCD (see pages 59 and 60). b) Keep exhaust systems to a minimum length and have gradual bends (NOT right angle elbows). Exhaust back pressure is increased by longer exhaust length and sharp bends. Back pressure should be measured; with the complete exhaust system connected and the engine running at full speed; and should NOT exceed 80mm

Hg (3.1 inches Hg). The correct measuring point is before the dry exhaust bellows (at the manifold flange).

We can supply a Manometer kit for testing ‘Back

Pressure’. c) The dry exhaust system installed in a canal boat or work boat should be 11/2” minimum internal diameter.

The engine is fitted with a 11/2” BSP male connector stub as standard - Valid for exhaust systems up to 3 metres in length. A flexible exhaust bellows and dry exhaust silencer should be used. It is up to the installer to work out his own pipe run but care should be taken as follows: • Never use a flexible exhaust bellow as a bend, it will crack, always keep them straight. • Ensure that rain water cannot enter the exhaust port and run back down the system, flooding the silencer and eventually the engine. (See drawings below). • The system should be lagged if there is any danger of the crew getting near it. • A dry exhaust system will give off considerable heat and suitable ventilation must be provided.

7 8

Silencer Silencer

Ensure exhaust raises then falls to outlet

Engine Connections

Actual Connector: Required Pipe Size:

Fuel supply and fuel leak-off connections are 8 mm OD piping for both, a flexible section is required 8 mm conex with olives

Heat Exchanger - Yachts

Seawater cooling pump connections are is 22 mm OD Sea water pump inlet = 22 mm ID hose Exhaust water injection bend is 50 mm OD Flexible rubber exhaust pipe of correct quality = 50 mm ID hose

Keel Cooling - Narrowboats

Keel cooling connections are 22 mm OD copper pipe Engine inlet and outlet = 22 mm ID hose Keel cooled exhaust stub is 11/2 ” BSP male thread 11/2 ” BSP female thread flexible exhaust pipe