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1. The swan neck must reach at least 450mm (18") above the waterline, when
installed on hull centreline.
2. The top of the silencer should be at least 300mm (12") below the water injection
point.
3. The silencer must be installed as near as possible to the centreline of the hull,
particularly where severe angles of heel are expected. The swan neck must be
450mm above heeled water line.
4. Remember that 15% of the volume of the exhaust hose may be water. The size of
the silencer selected must be such that water draining into it will fit it by no more
than one third.
5. A siphon break must be used.
The silencer may only be used in a Water Injected marine exhaust system. The
overall design of the system, and choice of components, will have a result on the back
pressure in the exhaust which is vital to the performance and life of the engine. The back
pressure falls within the manufacturers recommended range when using the optional exhaust
system with the engine. Barrus recommend that Halyard (M&I) Limited are used for the
Lift Silencer, Siphon Break and other components. Contact Halyard (M&I) Limited for
further information.
The silencer must be drained before the boat is craned or transported and during the winter.
There must be at least 450mm distance between the water injection point and the position of
the silencer to allow adequate cooling of the exhaust gases. Maximum temperature during
continuous operation of the silencer is limited to 85 degrees centigrade. Normally in a well-
designed system, the temperature of the silencer should be between 50-70 degrees
centigrade. Such operation will result in longer exhaust life.
RDG603A81 – Issue 2
Figure 15: Correct Installation of the Lift Silencer
Page 33 of 93
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