Final Engine Alignment - Mercury MX 6.2 MPI Installation Manual

INSTALLATION MANUAL

Final Engine Alignment

IMPORTANT: Engine alignment MUST BE RECHECKED with boat in the water, fuel
tanks filled and with a normal load on board.
Engine must be aligned so that transmission and propeller shaft coupling centerlines are
aligned and coupling faces are parallel within .003 in. (0.07 mm). This applies to installations
with solid couplings as well as flexible couplings.
1. Check mating faces on transmission output flange and propeller shaft coupler to ensure
that they are clean and flat.
2. Center propeller shaft in shaft log as follows:
a. Push down and then lift shaft as far as it will move. Then place shaft in the middle
b. Move shaft to port and then to starboard as far as shaft will move. Then place shaft
c. With shaft in the center of shaft log as determined by above procedures, align engine
Typical Down Angle (V-Drive Similar)
3. Check that coupling centerlines align by butting propeller shaft coupler against trans-
mission output flange. Shoulder on propeller shaft coupler face should engage recess
on transmission output flange face with no resistance.
Page 36 of 77
of the movement.
in the middle of the movement.
to shaft.
a - Up
b - Down
c - Port
d - Starboard
Incorrect
a
d
b
c
Correct
INDEX
72595
72597
90-864198020