EXHAUSTS (a) A correctly installed engine as described in this handbook will meet the exhaust emission requirements of Directive 2003/44/EC amending the Recreational Craft Directive 94/25/EC.
BD1005
BV1305
BV1505
50mm
50mm
50mm
1 5/8”
N/A
N/A
50mm
50mm
50mm
1 5/8”
N/A
N/A
50mm
50mm
50mm
Standard Option 1 5/8” is available in SS High rise water injection bend SS
(b) For compliance with exhaust emissions requirements, engines must have correctly installed exhaust systems. To ensure exhaust emissions are kept within permissible limits it is most important to reduce exhaust back pressure to a minimum, whilst ensuring exhaust is adequately muffled. Back pressure increases as exhaust length increases and from bends in the exhaust system. The exhaust back pressure,
Option high rise water injection bend SS Cross over injection bend SS to suit Volvo replacement engines.
measured with the exhaust system connected and the engine running at full speed, must not exceed 80mmHg (3.1 inches Hg / 42 inches WG). The correct measuring point is at the position where the exhaust connects to the exhaust manifold. That is
before the water injection elbow or dry exhaust bellows. Wet Exhaust hose should be matched to the injection bend sizes, see above.
TYPICAL YACHT INSTALLATION Maximum sea water level when healed (on the centre line of the boat)
Normal sea water level
a
300mm minimum
Sea water Level
Allow at least 10% of propeller diameter for tip clearance to hull
Anti syphon valve or T piece fitted here
X
Waterlock Silencer
If a rope cutter is fitted, allow approximately 1/2” for movement of engine, see manufacturer’s literature
WARNING: (1) One of the most common problems with engine installation is water entering the exhaust manifold from the exhaust system by syphoning. This can occur when the point of water injection (X) on the engine is close to or below the water line. Water entering the pistons can cause bent con rods, emulsified
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engine oil and a wrecked fuel pump! Its best avoided! (2) The diagram shows a typical installation. It is essential that the small black rubber hose connecting the heat exchanger with the injection bend is removed and replaced by a hose marked ‘a’. This must be of sufficient length to
supply either a T piece or an anti syphon valve sited at least 300mm (12 inches) above the water line and on the centre line of the boat. The pipe then returns to the injection bend and the sea water is pumped down the exhaust pipe. (3) The exhaust back pressure should not exceed 3.1 inches of Hg.
