RDG603A20 - Issue 10
Page 28 of 100
9. 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.
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.
Ensure that the anti-vibration mount centre screw is sufficiently raised so as not to
touch the engine bed. If this occurs, excessive engine vibration will be experienced
through the hull.
For best results, fit the front AV mounts into the front holes in the engine rails. If the
engine room space is a problem the mounts can be fitted slightly further back in the
alternative holes and the front of the rail cut off
– leaving 50mm of material to retain
strength (measuring from the centre of the mount hole to the front end of the rail).
Note: This procedure is only possible on non Travel Power engines, and may result in
a very slight increase in vibration. AV mount installation points are shown on (
Figure
19
)
