TPD 1317e Chapter 1
Page 5
1.3 Flexible Engine Mounts
It is recommended that exible engine mounts should be used for all applications. The principal purpose of the
mounts is to reduce the transmission of vibration from the engine to the hull, but another valuable advantage is
that the mountings reduce the shock transmitted from the hull to the engine under adverse weather conditions
and also prevent the engine being inadvertently used as a structural part of the boat, due to hull exure, a
function the engine will not satisfactorily full.
Figure 6 shows the leading dimensions of the exible engine mount which is satisfactory for most
applications.
Engines used with unusual drive arrangements, such as ‘V’ drives when integral with the engine unit, pose
special mounting problems and recommendations as to the most suitable mounting arrangement can be made
for specic applications.
Where transmission ratios in excess of 2.5:1 are employed, or where extreme service conditions can be
expected, (e.g. fast rescue boats) the standard mount should not be used, and a recommendation should be
obtained for the specic application.
Installation drawings are available showing the preferred mounting arrangements when using a variety of
gearboxes.
Radially
slotted hole
Dimensions:mm(inches)
*Dimensions given are for the
mount in the unloaded condition
Figure 6 - Typical exible engine mount - refer to installation drawing for
specic applications.
Height adjuster bolt
and nut
Height adjuster pad
*Minimum 125(4.9)
*Maximum 137(5.4)
(Bottom of mount to crankshaft
centre line)
A maximum of 13 shims can be
used per mount, 11 at 1mm thick
and 2 at 0.5mm thick..
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