Initial Engine Alignment; Final Engine Alignment - Mercury SKI Instruction Manual

GASOLINE ENGINES SKI MODELS

Initial Engine Alignment

1. Lift engine into boat and position on engine bed so that transmission output flange and
propeller shaft coupler are visibly aligned (no gap can be seen between coupling faces
when butted together). Adjust engine bed height, if necessary, to obtain proper align-
ment. DO NOT use mount adjustments to adjust engine position at this time.
IMPORTANT: Engine bed must position engine so that a minimum of 1/4 in. (6 mm)
up and down adjustment still exists on all 4 mounts after performing final alignment.
This is necessary to allow for final engine alignment.
2. Ensure that all 4 mounts are still positioned properly, then fasten mounts to engine bed
with 3/8 in. (10 mm) diameter lag screws (of sufficient length) and flat washers. Tighten
lag screws securely.
3. Disconnect overhead hoist and remove sling.

Final Engine Alignment

IMPORTANT: Engine alignment MUST BE RECHECKED with boat in the water, fuel
tanks filled and with a normal load onboard.
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 make
sure they are clean and flat.
2. 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.
NOTE: Some propeller shaft couplers may not have a shoulder on mating face. On these
installations, use a straight edge to check centerline alignment.
3. Check for angular misalignment by hand holding coupling faces tightly together and
checking for a gap between coupling faces with a .003 in. (0.07 mm) feeler gauge at 90
intervals.
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