Regal Velvet Drive 3007000E01, Service Manual, Page: 39 / 72

37
T R A N S M I S S I O N S
®
Section VIII Propeller Shaft Alignment & Flange Specifications
THE COUPLER AND/OR FLANGE FACES ARE NOT
PERPENDICULAR TO THE SHAFT
Symptoms may include: Knocking noise, leaking stuff-
ing box, leaking transmission rear seal, loose transmis-
sion output shaft nut, broken transmission shaft at
output nut .
TRANSMISSION FLANGE FACE IS NOT
PERPENDICULAR
The face and pilot bore are best checked with a dial
indicator . Both readings should be within 0 .002 inch
(figure 5) .
PROPELLER SHAFT COUPLER NOT PERPENDICULAR
The face of the coupler is best checked by taking four
(4) feeler gauge readings at one location against the
transmission flange and move the coupler in 90° incre-
ments for each reading (figure 6) . Readings must be
within 0 .002 inch .
BENT SHAFT
Symptoms may include: Knocking noise, leaking stuff-
ing box, leaking transmission rear seal, loose transmis-
sion output shaft nut, broken transmission shaft at
output nut .
Rotate shaft with a dial indicator held against its side
(figure 3) . Place indicator in position “2” to determine
coupler position relative to shaft .
Reading must be within 0 .002 inch . Replacement is the
only cure for a bent shaft .
THE SHAFTS ARE NOT CONCENTRIC
Symptoms may include: knocking noise, squeal or
moaning noise, leaking transmission rear seal .
This condition is corrected by moving the engine and
transmission as an assembly until the male pilot on
the shaft coupler enters the female pilot bore in the
transmission flange without force and the flange faces
meet with no more than a 0 .003 inch space at any point
around the circumference (figure 1) .
NOTE: It is imperative the transmission flange
and propeller shaft coupler faces be perpendicu-
lar to their shaft center lines and the propeller
shaft be free of bends below the water line as
well as inside the boat, before continuing with
this next step.
Figure 5. Determining Transmission Flange Runout
Figure 6. Determining Coupling Perpendicularly
Take readings with the shaft coupler in four (4) positions 90 degrees
apart . The trans . flange remains in the same position for each reading .