C. Trim Tab Maintenance
Check the fluid level of the trim tab reservoir often. Al-
ways keep the fluid level between the designated marks
on the trim tab pump-reservoir. Refer to the manufactur-
ers information for specifications on the type of fluid to be
used and other operation and maintenance information.
The use of trim tabs to attain quicker planing
shouldnotbeusedbyinexperiencedboaters. The
combinationofextremeinwarddrivepositionand
extended trim tabs can dangerously affect the
boats handling under certain sea conditions.
Moving the trim tabs downward will increase the lift and
the boat will achieve plane faster, or stay on plane at a
lower engine and boat speed.
B - 8
ENGINEINSTRUMENTATION
The helm station is equipped with a complete set of en-
gine instruments. These instruments allow the pilot to
constantly monitor the operational condition of the en-
gine. Closeobservationoftheseinstrumentscouldsave
the engine from damage.
After gaining plane and establishing cruising speed, de-
pressing both lower trim tab switches will cause both trim
tabs to move upward and will allow the bow to rise. This
should be used to adjust the running attitude of the boat
to decrease the drag at cruising speed or above, or when
running in a following sea.
Four Winns is using a new style of instrumentation pack-
age which consists of a module similar to units used in
the automobile industry. See Figure B4. This is limited
to the 238 and 258 Vista models. The 278 Vista will
havestandardinstrumentationwithgaugesintheshroud
or dash panel.
When running at an engine speed that results in the boat
falling off plane or causes the boat to plane inefficiently,
lowering both tabs slightly (bow down) will improve the
running angle and improve operating efficiency.
Optimum efficiency is obtained when operating at a 3 to 5
degree running angle. Utilizing too much “Bow Down”
trim tab can reduce operating efficiency and cause
substantialsteeringandhand-lingdifficulties. Beextremely
careful when running in a following sea. The effect of trim
tabs is amplified under such conditions. Steering and
handling difficulties can result from improper trim tab us-
age, especially in a following sea. If unsure of proper trim
tab positioning, raise the trim tabs to the full-up position.
Figure B4: 238 & 258 Vista Dash Module
The following general information on gauges applies to
all Vista models.
When running at high engine speeds, be sure
the trim tabs are in the full up position. Trim tab
action should be only enough to compensate for
any listing. Trim tab adjustments at high speeds
are extremely critical. Be prepared to slow down
should handling difficulties arise.
A. Tachometer
Thetachometerindicatesthespeedoftheengineinrevo-
lutions per minute (rpm). This speed is not the boat
speed or necessarily the speed of the propeller. The
tachometer may not register zero with the Ignition Key in
the OFF position.
NOTICE
Thecombinationofextremeinwarddriveposition
and extended trim tabs will cause a severe bow
down running angle. In certain sea conditions,
this will limit the operator’s control over the boat.
Never exceed the maximum recommended
operatingRPMofyourengine. Maintainingmaxi-
mum, or close to maximum RPM for extended
periods can reduce the life of the engine.
Whenrunninginadisplacement (veryslowspeed)mode,
better efficiency will be obtained with the trim tabs in the
full-up position.
Vista Owners Manual
10/93
Section B
Page7
| Categories | Four Winns Manuals, Outboard Marine Corporation Manuals |
|---|---|
| Model Year | 1998, 1999 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx |
| Document File Type | |
| Publisher | fourwinns.com |
| Wikipedia's Page | Outboard Marine Corporation |
| Copyright | Attribution Non-commercial |
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