Coupling Alignment Procedure:
E - 5
Boat must be in water for at least 24 hours
before alignment is started.
Knowledge of the propeller is most easily gained
through better understanding of the terminology
used to refer to the aspects of propeller size and
performance. It should be noted the V375 inboard
models are equipped with nibral propellers and most
stern drives V375 models include stainless steel
Check to be sure that the shaft can be turned
with one hand on the coupling.
Assure that all shaft coupling nuts and bolts
are installed but loose.
Separate coupling face from transmission
Diameter is twice the distance from the center of
the prop shaft to the extreme tip of a propeller blade.
Increasing or decreasing propeller size will have a
direct bearing on the RPM’s an engine will develop.
This is due to the greater amount of propeller blade
surface in contact with the water. See Figure E5.
Using a set of feeler gauges, measure the gap
between the coupling face and the transmission
output face, next to each bolt, without rotating
Subtract the smallest measurement from the
A. If the difference is .004” or less, snug up
each nut and bolt, then tighten each nut to
to 15 ft.-lbs of torque, then retighten
each nut to 30 to 35 ft.-lbs. of torque.
B. If the difference is greater than .004”,
adjust engine and transmission mounts up
or down, sideways and/or fore and aft until
the difference between the highest of the
measurements and lowest is .004” or less.
Snug up each nut and bolt, then tighten
each nut to 10 to 15 ft.-lbs of torque, then
retighten each nut to 30 to 35 ft.-lbs. of
Check to be sure that the shaft can be turned with
one hand on the coupling.
If the shaft can not be turned with one hand on
the coupling, readjust the engine and transmission
mounts up and down, sideways, and/or fore and
aft until the difference between the highest of the
measurements and lowest is .004” or less. Snug
up each nut and bolt, then tightening each nut to
Figure E5: Propeller Pitch & Diameter
Pitch is a measure of helix angle, or angle of attack,
of the rotating blade. Pitch is easily understood if one
imagines the propeller rotating through a semisolid
such as butter or gelatin. The distance the propeller
will travel in one revolu tion is called “Pitch.” Increasing
or decreasing pitch will also have a direct bearing on
engine RPM’s because of the greater bite taken by
the blade with each rotation. See Figure E4.
to 15 ft.- lbs. of torque, then retightening each
nut to 30 to 35 ft.-lbs of torque. Be sure the shaft
can be turned with one hand on the coupling.
Repeat this procedure on the other side.
Engines, Drives and Instrumentation - Section E
Owner’s Manual Page 57
|Categories||Four Winns Manuals, Four Winns V-Series Manuals|
|Tags||Four Winns V375|
|Document Type||Owner's Manual|
|Product Brand||Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx|
|Document File Type|
|Wikipedia's Page||Outboard Marine Corporation|
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