Propeller Shaft - Four winns 378 Vista Owner's Manual

C. Propeller Shaft
NOTICE
When lifting the boat, always position the lifting
straps at the corresponding "sling" labels. Lifting
the boat with lifting straps over the prop shafts
will cause the shafts to become bent. Improper
lifting technique will not be covered under war-
ranty.
The prop shafts of all our V-drive boats are aligned at the
factory. Prop shaft alignment should be checked by your
dealer during pre-delivery service. Shaft alignment should
be checked again forty-eight hours after initial com-
missioning. Periodic checks of shaft alignments, and
engine V-drive mounting bolts should be made; especially
if noise or vibration occurs.
NOTICE
Excessive vibration, abnormal shaft log wear, or
broken propeller shaft coupling bolts are an indi-
cation of misalignment. Misalignment can also
cause severe damage to shaft logs, struts, shafts
and the engine transmission or v-drive. Realign-
ment should only be performed by a qualified ser-
vice person. The following procedures are provid-
ed so a boat owner can determine if service work
is required.
The propeller shaft coupling and engine/V-drive output flange
coupling must be aligned to within 0.004 inches. Always
be sure the prop shaft is centered in the strut bearing and
shaft log before alignment adjustments are made. Refer
to Figure E3.
.004" Max
Figure E3: Coupling Alignment
378 Vista™ Owner's Manual
™
378
Coupling Alignment Procedure:
1. Boat must be in water for at least 24 hours before
alignment is started.
2. Check to be sure that the shaft can be turned with
one hand on the coupling.
3. Assure that all shaft coupling nuts and bolts are
installed but loose.
4. Seperate coupling face from transmission output
flange.
5. Using a set of feeler gauges, measure the gap be-
tween the coupling face and the transmission out-
put face, next to each bolt, without rotating the shaft.
6. Subtract the smallest measurement from the larg-
est.
A. If the difference is .004" or less, snug up each
nut and bolt, then tighten each nut to 10 to 15
ft.-lbs of torque, then re-tighten 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 re-tighten each nut to 30 to 35 ft.-
lbs. of torque.
7. Check to be sure that the shaft can be turned with
one hand on the coupling.
8. 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 mea-
surements and lowest is .004" or less. Snug up
each nut and bolt, then tightening each nut to 10 to
15 ft.-lbs. of torque, then re-tightening each nut to
30 to 35 ft.-lbs of torque. Be sure the shaft can be
turned with one hand on the coupling.
9. Repeat this procedure on the other side.
Section E
Page 4