RDG603A17 – Issue 1 – Shire 30_40_50 WB/RB Manual
Page 11 of 51
SECTION 3 – Installation
1. Ventilation
•
All internal combustion engines radiate heat and require cool, clean air to aid
complete combustion.
•
Please Ensure that adequate engine room ventilation is provided, by fitting at least
two vents of an aperture of not less than 10,000mm2 each (16in
2
).
An allowance must be made for any grills, louvres or bends placed in the airflows
and generally an increase of 25% in area is sufficient to overcome any restriction
problems.
2. Engine Beds
•
These should be a minimum of 10mm thick, extended rearward and be welded to the
hull and forward to the bulkhead. Webs or gussets must be welded in place midway
to prevent flexing.
3. Pressurised Water Header Tank
•
The pressurised header tank should be mounted higher than the level of the engine
and no more than 1 metre from the engine. This is to prevent cooling system air
locks.
4. Shaft Connection and Propeller Selection
•
Some type of flexible coupling must be used to connect the gearbox output flange to
the propeller shaft flange. Various coupling flanges are widely available to assist with
this.
Note: Underperforming engines will not be covered under warranty if the cause of the poor
performance is found to be due to the use of an inappropriate propeller.
5. 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 steel packing plates
under the mounts. Packing plates 25mm thick are available: Order RDG3906 Engine
mount spacer. Alternatively they can be manufactured locally.
•
On the Shire 30 WB/RB there are two different sizes of Anti-Vibration Mounts used.
The small mounts are used at the front of the engine along with spacer blocks. The
