Regal Velvet Drive 3007000E01, Service Manual, Page: 38 / 72

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T R A N S M I S S I O N S
®
Section VII Propeller Shaft Alignment & Flange
PROPELLER SHAFT ALIGNMENT
The term “Propeller Shaft Alignment” is really a mis-
nomer because we are really not aligning the prop
shaft . We are aligning the engine and transmission as
an assembly . We can reposition the prop shaft axially,
but we cannot move it latterly . We must instead move
the engine and transmission assembly to align with the
prop shaft . The prop shaft is the boss .
The following are the three basic conditions that are at
the root of all prop shaft alignment problems .
1 . The face of the prop shaft coupler and/or transmis-
sion flange may not be perpendicular to the center
line of its respective shaft (figure 2) .
2 . The shaft may be bent (figure 3) . Place indicator in
position “2” to determine coupler position relative
to shaft .
3 . The center lines of the transmission output and pro-
peller shafts are not concentric . Their center lines
may be parallel or crossing (figure 4) .
SHAFT ALIGNMENT PROCEDURE
Propeller shafts with a third or more of their total
length protruding inside the boat should be supported
in their best neutral position when disconnected from
the transmission . If there is any doubt, support .
Figure 1. Flange and Coupler
Figure 2. Coupler Perpendicularly
Figure 3. Bent Shaft (Exaggerated)
Figure 4. Shaft Concentricity
NOTE: It is most important the following steps be
taken in order.
NOTE: Illustration exaggerates a bend
inside the boat . It must be remembered
bends under the water line have similar
symptoms .