Engines With Mercruiser Bravo® Stern Drive - FNM HPE Series Installation Manual

4.2 Engines with Mercruiser Bravo® stern drive
For the installation of the engine supplied with Mercruiser
Bravo® I, II or III, stern drive, carefully follow the
manufacturer's installation manual (Cummings Mercruiser
Diesel®) supplied with the engine. Please also consider the
following information.
Carefully follow the instructions contained in the
stern drive installation manuals of the manufacturer,
or this may invalidate the warranty.
The transom positioning is not covered by this manual, and is
available on the stern drive manufacturer's manual. The hull
and engine compartment of the boat must be designed so as
to allow the correct positioning of the transom - and
consequently the engine - inside of them, without causing
problems to the circuits connection (such as e.g. exhaust for a
too high waterline related to the engine position).
4.2.1 Stern drive transom preparation
After positioning the transom and installing the piston to
control the rudder and the rear exhaust, as described in the
installation manual of the stern drive Mercruiser Bravo®,
before installing the rest of the stern drive, it is necessary to
position and install the engine. Follow the steps below:
1. Make sure that the engine bell contains the rubber bushes
needed to couple with the transom supports. The
bushings are shown in the image of Figure 11 with the
letter a.
Figure 11 - Engine bell for Mercruiser Bravo® stern drive
2. Always use fibre washers (indicated by the letter b in
Figure 11) between the engine bell and transom.
4.2.2 Engine positioning with Bravo Mercuiser stern
drive
After preparing the transom, follow these steps:
3. Lift the engine and keep it suspended above the side
members. Make sure the engine is level when suspended.
For the criteria for handling the engine, refer to the paragraph
3.2 - Engine Disassembling and Handling on page 7.
4. Lower the engine in the hull position making it go down
slowly.
5. Install flexible mountings at the front of the engine (see
paragraph 4.1 – Anti-vibration mounts on page 14). Do
not tighten the nuts of the supports , or the supports to the
side members.
The supports tightening must be performed only at
the end of this procedure.
6. Align the rear of the engine with the transom inner plate.
At the same time align the upper exhaust pipe of the
engine with the lower exhaust of the transom.
A wrong coupling between the bell supports and the
transom cause inaccurate alignment, which may
lead to irreparable damage of the engine.
7. Insert and tighten both bolts as shown in Figure 12. Do
not tighten the bolts, but leave a clearance.
Figure 12 - Bolts tightening between the engine and transom
supports. a) engine support; b) transom support; c) bolt; d) lock
washer; e) spacer; f) spring washer; g) lock washer with double helix.
8. Adjust the front supports of the engine until the side
members touch the hull. Do not tighten the supports to the
side members.
9. Make sure the engine is on all four support points (the two
front dampers and the rear transom supports).
FNM® Series HPE – Installation Manual – 15