Engine Final Alignment - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

Engine Final Alignment

To avoid vibration, noise and damage to transmission output shaft oil seal and
bearings, engine must be properly aligned.
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 output flange and propeller shaft coupler cent-
erlines are aligned and coupling faces are parallel within .003 in. (0.07mm). This applies to
installations with solid couplings, as well as flexible couplings.
1. Check mating surfaces on transmission output flange and propeller shaft coupler faces
2. Follow instructions "a" or "b":
Index
90-861326--1 MARCH 1999
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to make sure they are clean and flat.
a. On V-Drive Transmission Models: Proceed to Step 3.
b. On Down Angle Transmission Models: Center propeller shaft in shaft log as
follows:
(1.) Push down and lift shaft as far as it will move. Then place shaft in the middle of
the movement.
(2.) Move shaft to port and then to starboard as far as shaft will move. Then place
shaft in the middle of the movement.
(3.) With shaft in center of shaft log, as determined by above procedures (1) and (2),
align engine to shaft.
a - Up
b - Down
c - Port
d - Starboard
CAUTION
a
c
b
MIE MODELS - HURTH TRANSMISSION
d
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