Mercury MerCruiser Service Manual page 136

Installation
3. Check that the flange coupling centerlines align by butting the propeller shaft flange against the transmission output flange.
The shoulder on the propeller of the shaft flange face should engage the recess on the transmission output flange face with
no resistance.
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NOTE: Some propeller shaft flanges may not have a shoulder on the mating face. On these installations, use a
straightedge to check centerline alignment.
a
4. Check for angular misalignment by holding the flange coupling faces tightly together by hand, and checking for a gap
between them with a 0.07 mm (0.003 in.) feeler gauge. Check the gap at 90° intervals.
b
c
a
ZF Marine
a - Propeller shaft flange
b - Feeler gauge
c - Transmission output flange
5. If the flange coupling centerlines are not aligned or if the flange coupling faces are more than 0.07 mm (0.003 in.) out of
parallel, adjust the engine mounts.
a. To adjust the engine up or down: Loosen the locking nut on the mounts requiring adjustment and turn the adjusting
nuts in the desired direction to raise or lower.
IMPORTANT: Both the front mount (or rear mount) adjusting nuts must be turned equally to keep the engine level
from side to side.
b. To move the engine to the left or right: Loosen the clamping bolts and nuts on all four of the mount brackets and
move the engine to the left or right as necessary to obtain the proper alignment. A small amount of adjustment can be
obtained with the slot on the front end of some mounts. Loosen the lag bolts that fasten the mounts to the engine bed,
and move the engine, as required. Tighten the lag bolts securely.
Page 2B-32
Incorrect
c
b
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© 2016 Mercury Marine
a - Transmission output flange
b - Propeller shaft flange
c - Propeller shaft
d - Straightedge
d
b
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Correct
c
a
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90-8M0099748 eng DECEMBER 2015