25
360 C
OASTAL
DO NOT ATTEMPT TO OPERATE THE BOAT IF THE
PROPELLER DOES NOT FIT PROPERLY ON THE
SHAFT. PROBLEMS SUCH AS SHAFT VIBRATION,
PROPELLER HUB FAILURE OR SHAFT FAILURE
MAY OCCUR.
1.8
Performance and Propellers
Your boat was shipped with propellers that typically provide
optimum performance for your boat. However there are fac-
tors that can affect performance and propeller requirements.
Some are as follows:
•
Before changing propellers to correct boat performance
problems, be sure other factors such as engine tuning,
bottom and running gear growth, etc., are not the source
of performance changes. You also should be sure the
load conditions are those normally experienced. If the
boat ran in the required RPM range when it was new and
you have not added any additional gear or heavy
equipment and have not damaged the propellers, there is
a good chance the propellers are not the problem.
•
It is extremely important that the boat is propped to run
at or very near the recommended top RPM with an
average load. If the top RPM is above or below the
recommend range, the propellers must be changed to
prevent loss of performance and possible engine damage.
•
Large diesel or gas engines can be damaged and the
warranty void if the boat is not propped correctly. Always
consult your Wellcraft or authorized engine service dealer
when making changes to the propellers or if the boat does
not run near the top recommended RPM.
•
The addition of a Marlin or Tuna tower, heavy equipment
like life rafts, personal water craft, additional coolers,
etc., will cause additional load on the engines.
Consequently, different propellers may be required.
•
Boats operated at high altitudes (above 2000 feet).
Engines operated at high altitudes will not be able to
develop as much horsepower as they do at or near sea
level. Consequently, different propellers may be required.
KEEP AWAY FROM THE PROPULSION MACHINERY
DURING ITS OPERATION OR WHENEVER THE BOAT
IS IN MOTION. MOVEMENT OF WATER PAST A
PROPELLER CAN CAUSE THE PROPELLER, SHAFT
AND OTHER PROPULSION MACHINERY TO ROTATE
EVEN IF THAT EQUIPMENT IS NOT BEING
OPERATED INTENTIONALLY.
1.9
Running Gear
Shaft Logs and Dripless Seal
The shaft logs, which are fastened into the hull bottom, allow
the propeller shaft to extend and rotate through the hull. The
shaft log is equipped with a special “Dripless” propeller shaft
seal. To lubricate this seal, seawater from the engine cooling
system is injected into each shaft seal through a hose that is
connected to the engine and the shaft seal housing. There is
another hose connected to each seal that allows water to be
injected into each seal from either engine. This provides cool-
ing and lubrication for both seals when operating on one en-
gine.
The shaft seal must have positive water injection any time
the propeller shaft is rotating. The water flow to each seal
should be tested annually by removing the water injection
hose from the seal fitting and running the engine at idle with
the transmission in neutral. There should be a positive flow
of water from the hose. If no water is flowing from the hose,
contact your dealer or the Wellcraft Customer Service De-
partment before operating your boat. Some water will leak
into the bilge from the hose fitting on the seal assembly dur-
ing this test. The hose should immediately be reattached and
the hose clamps tightened securely when the test is completed.
Please refer to the seal manufacturer owner’s manual for ad-
ditional information on the shaft seal.
Proper performance of the shaft seal is directly dependent
upon correct propeller shaft alignment. Propeller damage, a
bent strut or shaft, or abnormal wear, settling, etc. are com-
mon reasons for misalignment. This can cause such prob-
lems as repeated shaft leakage, excess seal wear, shaft log
and assembly damage, premature strut bearing wear, etc. It
is, therefore, important that the alignment be periodically
checked and adjustments are made when necessary.
Dripless Shaft Seal, Bonding Connection and Water Hose
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