Page 45 - REPOWER REFERENCE GUIDE (2020)

P. 45

Engine and Drive Installation Requirements
Transom Specifications
Angle 10–16 degrees (13–16 degrees preferred).

a e
d d

c 7508

a - Transom thickness
b - Inner surface
c - Outer surface
d - Transom assembly coverage
e - Transom angle
IMPORTANT: Transom coverage area dimension varies for single, dual, or triple applications.
IMPORTANT: Transom thickness, parallelism, and flatness should be measured on every installation (after making cutout) as
shown in the following:

7682

a - Measuring thickness
b - Measuring surface flatness (measure horizontally and vertically)
c - Suitable mandrel to check for uniform transom thickness

Engine Bed Requirements

The engine bed (i.e. stringers) must be designed to support the G‑forces imposed by the engine during the most severe duty.
The bed must also handle the torque produced by the engine and the thrust generated by the propeller. Deflection of the
engine bed could stress the engine components, causing possible engine misalignment and transmission failure. The proper
design of the engine bed varies considerably from one boat design to the next. Therefore, Mercury MerCruiser makes no
attempt to provide detailed engine bed design requirements to cover all possible applications. The proper design of the engine
bed is left to the boat manufacturer. The following general guidelines are provided:
• The engine bed must be firmly affixed to the boat and should be made as large as possible to distribute the load evenly.
Reinforcements should be used where necessary. Mount pad locations should be as large as possible.
• Refer to installation drawings for engine mount spacing and other dimensions.
• The engine bed must position the engine so that a minimum 6.4 mm (1/4 in.) of up and down adjustment exists on all four
mounts after performing the final engine alignment. This is necessary to allow for realignment in the future. Engine mount
isolators will compress slightly over time.

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