Stern Drive; Inboards V-Drives; Underwater Equipment; Shaft Log - Four winns 248 Vista Owner's Manual

the model, a choice of Mercruiser® (gas) or Volvo-Penta®
(gas or diesel) engine(s) is offered. Please consult the
engine owner's manual provided with this manual for op-
eration and maintenance information. See your Four
Winns dealer for complete engine availability.
B. Stern Drive
A stern drive or inboard/outboard propulsion system has
a piston engine equipped with special marine components
mounted near the transom and coupled to an external
outdrive-type transmission unit. Shifting is performed
within the outdrive upper gear case. This type of system
is depicted in Figure E1.
Outdrive
Figure E1: Stern Drive
Consult the Engine Owner's manual for additional informa-
tion on stern drives.
C. Inboard V-drives
On the V-drive propulsion system of the inboards, all shift-
ing and gearing components are installed inside of the
hull, only the propeller shafts and associated equipment
are under water. The V-drive system has the engine
mounted in the extreme stern of the boat with the output
shaft facing forward. A transmission which performs shift-
ing functions is mounted directly onto the engine. A V-drive
reduction gearbox is mounted directly to the transmis-
sion. The prop shaft is then connected to the V-drive
output coupling. See Figure E2.
Vista™ Owner's Manual
™
Engine
Always return the engine throttle lever to the ex-
treme low speed position before shifting. NEVER
shift the unit while engine speed is above
800 rpm.
E - 4 UNDERWATER EQUIPMENT (Inboards)
Avoid running aground or striking a (submerged)
object. Serious damage to the engine(s) or in-
board underwater gear can result and the boat
can take on water. In the event of such an occur-
rence, proceed at low speed to the nearest ser-
vice facility and have an immediate inspection
made of the prop shafts and struts before further
use of the craft. Keep all life saving devices at
hand while driving to a dock area. If the boat
cannot be immediately removed from the water,
thoroughly inspect the bilge area for leaks so
that the boat does not sink while moored.
A. Shaft Log
The shaft log allows the propeller shaft to extend and
rotate through the hull with only limited water leakage
occurring. Minor dripping may occur and is not abnormal
during operation. See Figure E2 & E3.
Proper performance of the shaft seal is directly depen-
dent upon correct propeller shaft alignment. Propeller
damage, a bent strut or shaft, or abnormal wear, settling,
etc., are common reasons for misalignment. Therefore,
periodically have the shaft alignment checked and have
adjustments made when necessary.
Figure E2: V-drive
NOTICE
Section E
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