Chapter 2: Components/Systems 17
4100 SCB Owner’s Manual Supplement
Stuffing Replacement Procedure:
1. Remove the boat from water.
2. Loosen the packing gland nuts and back the packing gland from the sleeve.
3. Remove the old packing.
4. Wrap new packing around the shaft.
5. Cut the rings with a razor blade at an angle approximately 30 degrees to the long axis of the shaft.
6. Stagger the ends of each ring around the shaft and insure that the ring are at the bottom in the sleeve.
7. Tighten the packing gland nuts until resistance is felt (DO NOT over tighten the packing gland nuts).
Shaft-Transmission Alignment
Alignment between the engine transmission output shaft and
the propeller shaft is critical. This alignment has been per-
formed at the factory, and was rechecked by the dealer after
your yacht had been in the water for 48 hours.
• An alignment inspection should be performed as part of
the routine maintenance program by a marine mechanic
after the initial 30 hours of operation, then annually or
whenever an unusual noise or vibration is noticed.
• The gap between flange faces should be less than 0.003".
• Replacement flange bolts, nuts and washers must be
corrosion resistant and grade 8 or better.
• Recheck flange bolt torque after 20 hours of operation.
Tighten the flange bolts according to the torque specifica-
tions listed in the table below.
TYPICAL TRANSMISSION-TO-PROP SHAFT COMPONENTS
TRANSMISSION-TO-PROP SHAFT COMPONENTS VARY,
DEPENDING UPON ENGINE TYPE AND SIZE
SECTION VIEW
OF HULL
CLAMPS
CLAMPS
SHAFT LOG
(TRIANGLE FLANGE)
BELLOWS
SHAFT
ROTOR
FLANGE BOLT (TYPICAL)
POSSIBLE QUANTITY:
CARBON/GRAPHITE
FLANGE
COUPLER
TRANSMISSION
OUTPUT FLANGE
4, 6 OR 8 BOLTS
DETAILED VIEW
FLANGE BOLT SPECIFICATIONS
BOLT SIZE TORQUE
3/8” - 24 40 +/- 7 lb.
7/16” - 20 65 +/- 10 lb.
1/2” - 20 95 +/- 15 lb.
5/8” - 18 200 +/- 30 lb.
M16 x 1.5 175 +/- 25 lb.
• A marine mechanic should perform the engine alignment since it requires moving the
engine.
• If a shaft misalignment exists, have a qualified marine mechanic perform an alignment as
soon as possible. Continued use may lead to premature engine, transmission, shaft, shaft
seal and/or hull damage!
CAUTION!
!
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