Engine Instrumentation - Four winns 338 Vista Owner's Manual

above, or when run ning in a following sea.
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 efficien cy is obtained when operat ing at a
3 to 5 degree running angle. Utilizing too much "Bow
Down" trim tab can reduce operat ing effi ciency and
cause substan tial stee ring and handling difficul ties.
Be extreme ly careful when running in a following sea.
The effect of trim tabs is ampli fied under such condi-
tions. Steer ing and handling difficulties can result from
im proper trim tab usage, espe cially in a following sea.
If unsure of proper trim tab positioning, raise the trim
tabs to the full-up position.
When run ning at high en gine speeds, be sure
the trim tabs are in the full up posi tion. Trim tab
ac tion should be only enough to com pen sate
for any list ing. Trim tab ad just m ents at high
speeds are ex tre mely critical. Be prepared to
slow down should handling difficulties arise.
When running in a displacement (very slow speed)
mode, better efficiency will be obtained with the trim
tabs in the full-up position.
C. Trim Tab Maintenance
Check the fluid level of the trim tab reservoir often.
Always keep the fluid level between the designat ed
marks on the trim tab pump-reservoir. Refer to the
manufacturers information for specifi cations on the
type of fluid to be used and other operation and
maintenance infor mation.
E - 8

ENGINE INSTRUMENTATION

The helm station is equipped with a complete set of
engine instruments. These instruments allow the pilot
to constantly monitor the operational condi tion of the
engine. Close observa tion of these instru ments could
save the engine from damage.
The 338 Vista models have individual as well as
®
combination gauges in the dash panel as standard
instrumentation. See Figure E5.
Engines, Drives and Instrumentation - Section E
Tach/Hour Meter
4-in-1 Gauge
Trim Gauge Trim Gauge
Figure E5: 338 Vista
A. Tachometer
The tachometers indicate the speed of the engines in
revolutions per minute (RPM) and are preset by Four
Winns. This speed is not the boat speed or necessar-
ily the speed of the propel ler. They may not register
zero with the ignition key in the OFF position. Note:
The 338 Vista models come with a tachometer/hour
®
meter combination gauge which allows for hour meter
viewing at the helm. See Figure E5. Please refer to
Section E-9I - Engine Hour Meter for information
regarding the engine hour meter.
NOTICE
Never exceed the maximum recommend ed
operat ing RPM of your engines. Main taining
maximum, or close to maximum RPM for
extended periods can reduce the life of the
engines.
Some engines are equipped with devices that limit
engine RPM in accordance with the oil pressure or
engine temperature. Refer to the engine owner's
manual for additional information.
The tachometer must be set for different engines
installed. This is typically done at the factory. The
tachometer gauge is shown along with the table detail-
ing the tachometer settings. See Figure E6.
Tach/Hour Meter
4-in-1 Gauge
®
Helm Station
Owner's Manual Page 59