Engine Final Alignment - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

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 0.07 mm (0.003 in.). This applies
to installations with solid couplings, as well as flexible couplings.
1. Ensure that mating surfaces on transmission output flange and propeller shaft coupler
faces 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 center of shaft log, as determined by above procedures a. and b. align
90-860074--1 FEBRUARY 2002
of the movement.
in the middle of the movement.
engine to shaft.
a-Propeller Shaft
b-Propeller Shaft Coupler
c-Transmission Output Flange
CAUTION
a
c
b
INBOARD (MIE) MODELS
d
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