RDG603A11 - Issue 10 - Shire 14 85, 130 WB Owners
Manual Page 26 of 52
Work Boat with Water Injected Exhaust:
If the engine is installed low down in the boat, below the outside water level, a system
such as a Lift Silencer with a siphon break system, must be used to prevent sea water
from flowing back down the exhaust and into the engine.
Ideal internal exhaust hose diameter is 100mm (4”) or a minimum of 75mm (3”) ID if
space is a problem, but this smaller diameter may cause excessive back pressure in
installations with a very complex route.
The maximum engine exhaust back pressure is 7.5 kPa (1.08 psi) initially for the 4045
(Shire 85) and 6068 (Shire 130) Blocks.
Lift Silencer
The correct installation of the lift silencer is vital to safety, and to avoid back flooding
of the engine.
Error! Reference source not found.
shows how to install the lift
silencer correctly
(Note: Halyard (M&I) Limited have given Barrus permission to use the diagram).
Correct Installation of the Lift Silencer
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.
Summary of Contents for SHIRE 14 85 WB
Page 45: ...SECTION 8 Wiring Diagrams...
