Shaft Connection And Propeller Selection; Engine Anti-Vibration Mounts - Barrus Shire 15 70WB Manual

• The pressurised header tank should be mounted higher than the level of the engine,
no less than 300mm, and no more than 1m from the engine, to prevent cooling system
air locks.
• The header tank has two hose connections of different internal diameters. The smaller
internal diameter hosetail (left side of tank) should be connected to the top of the
thermostat housing on the engine. This is the air-bleed. The larger internal diameter
hosetail (right side of tank should be connected to the lower pipe on the engine. This
is the water-fill. The hoses MUST be connected correctly.
• A constant rise on pipework is required to prevent air locks

5. Shaft Connection and Propeller Selection

• Some type of flexible coupling must be used to connect the gearbox output flange to
the propeller shaft flange.
• Please note, underperforming engines will not be covered under warranty if the cause
of the poor performance is found to be the use of an inappropriate propeller.

6. Engine Anti-Vibration Mounts

• Ensure that the engine feet do not end up at the top of the thread on the engine
mounts, this puts undue pressure on them and can result in excessive engine
movement and premature mount failure. If this is a problem, put the steel packing
plates which are supplied with the engine under the mounts. The packing plates are
25mm thick. If additional packing plates are required order: RDG3906 Engine mount
spacer. Alternatively, they can be manufactured locally.
• Ensure that the engine has been installed for at least 24 hours before shaft alignment
is checked, to allow the mounts time to settle under the engine weight.
RDG603A81 – Issue 2
Figure 8: Shire 70 Header Tank Connections
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