N40475 Chapter 2 Flexible engine mounts It is recommended that flexible 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 flexing in the hull, a function the engine will not satisfactorily fulfil. Figure 5 shows the flexible engine mount for most applications. Note:
refer to the installation drawing for specific dimensions, which are for the mount in the unloaded condition. To adjust the height of the mount, use the adjuster nut and bolt (2) against the pad (3) to introduce shims (4). A maximum of thirteen shims per mount can be used, eleven at 1mm thick and 2 at 0.5mm thick. Radially slotted holes (5) can be utilised to obtain the optimum position. 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 specific applications. Note:
For transmission ratios above 2:1 or use in extreme conditions, please contact your local distributor for advice. Figure 5 Installation drawings are available showing the preferred mounting arrangements when using a variety of gearboxes and applications. Page 5