Engine Mounting Brackets
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| Illustration 1 | g00799365 |
(1) 35 mm (1.378 inch) (2) 114 to 124 mm (4.49 to 4.88 inch) (3) 460 mm (18.11 inch) center of crankshaft to center of flexible engine mount (4) 460 mm (18.11 inch) center of crankshaft to center of flexible engine mount (5) 550 mm (21.65 inch) center of crankshaft to center of flexible engine mount (6) 550 mm (21.65 inch) center of crankshaft to center of flexible engine mount | |
The standard engine mounting brackets provide mounting points which are 35 mm (1.38 inch) below the centerline of the crankshaft. The standard engine mounting brackets are also parallel to the centerline of the crankshaft.
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| Illustration 2 | g00799366 |
(7) 460 mm (18.11 inch) or 550 mm (21.65 inch) center of crankshaft to center of flexible engine mount (8) 654 mm (25.75 inch) center of flexible engine mount to center of flexible engine mount | |
The engine can be mounted directly to the engine stringer with the engine mounting brackets. However, flexible engine mounts are recommended for all applications.
Alignment of the Engine
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| Illustration 3 | g00799368 |
Typical example of the engine that is mounted on the engine stringer | |
Place the engine on the engine stringers in the hull of the vessel. Adjust the position of the engine until the engine is aligned to the propeller shaft. The engine should be aligned horizontally and the engine should be aligned vertically.
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| Illustration 4 | g00799369 |
Location of the holes that should be drilled first | |
Drill four holes in the engine stringer. Refer to Illustration 4 for the locations of the first four holes. The engine should then be bolted to the engine stringers by using the drilled holes. Do not tighten the bolts.
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| Illustration 5 | g00799370 |
Fine adjustments to the flexible engine mount | |
The engine mount can be adjusted, if necessary. Refer to Illustration 5. Drill the remaining four holes in the flexible engine mounts. Shims may be used for more precise alignment. Ensure that all eight bolts are fully tightened.
Engine Stringers
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| Illustration 6 | g00799378 |
Typical example of the engine that is installed on the inside of the engine stringers | |
Many types of engine stringers can be used to mount the engine. Illustration 6 shows the engine mounted inside of the engine stringers.
Use the following guidelines when the engine stringers are designed:
- The engine stringers should support a static load of 5 to 8 times the weight of the engine and transmission.
- Cross braces should be installed in order to give lateral support. This will prevent twisting forces.
- The engine stringers should be as rigid as possible.
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| Illustration 7 | g00799379 |
Typical twin engine installation (1) 630 mm (24.80 inch) center of the crankshaft to center of the crankshaft | |
Twin engine installations should have an engine stringer that is mounted in the center of both engines. Refer to Illustration 7 for the minimum distance from the center of the crankshaft to the center of the crankshaft. This distance must be kept in twin engine installations so that the engines can be serviced.