Table of Contents
Advertisement
Section 2 - On The Water
Marine vegetation may accumulate when the boat is docked. This growth must be removed before operation; it may clog water
inlets and cause the engine to overheat.
Elevation and Climate
Elevation and climate changes affect the performance of your power package. Loss of performance can be caused by:
•
High elevations
•
High temperatures
•
Low barometric pressures
•
High humidity
For you to have optimum engine performance under changing weather conditions, it is essential that the engine be propped to
allow the engine to operate at or near the top end of the specified maximum RPM range with a normal boat load during your
normal boating weather conditions.
In most cases, the recommended RPM can be achieved by changing to a lower pitch propeller.
Propeller Selection
Operating the engine with the wrong propeller installed can limit power, increase fuel consumption, overheat the engine, or
cause internal powerhead damage. Choose a propeller that allows the engine to operate at the specified wide open throttle
RPM.
It is the responsibility of the boat manufacturer and the selling dealer to equip the power package with the correct propellers.
IMPORTANT: Be sure that the propeller being used does not allow the engine to run against the limiter, as a significant loss in
performance will result.
NOTE: Use an accurate service tachometer to verify RPM.
Select a propeller that will allow the engine power package to operate at the rated engine RPM with a full load.
If full throttle operation is below the engine rated RPM, the propeller must be changed to prevent loss of performance and
possible engine damage. On the other hand, operating an engine above the rated engine RPM will cause higher than normal
wear or damage.
After initial propeller selection, the following common problems may require that the propeller be changed to a lower pitch:
•
Warmer weather and greater humidity cause an RPM loss (not as significant on these models).
•
Operating in a higher elevation causes an RPM loss (not as significant on these models).
•
Operating with a damaged propeller or dirty boat bottom causes an RPM loss.
•
Operating with increased load (additional passengers, pulling skiers).
For better acceleration, such as is needed for waterskiing, use the next lower pitch propeller. Do not operate at full throttle
when using the lower pitch propeller but not pulling skiers.
Break‑In
Initial Break‑In Procedure
It is important to follow this procedure to properly break in the engine.
IMPORTANT: Mercury Marine recommends that the boat not be accelerated hard until this procedure has been completed.
IMPORTANT: Never operate the starter motor longer than 15 seconds at a time to avoid overheating the starter motor. If the
engine does not start, wait one minute to allow the starter motor to cool; then, repeat the starting procedure.
1.
Refer to the appropriate Starting, Shifting, and Stopping section and start the engine.
2.
Operate the engine at a fast idle until it has reached normal operating temperature.
3.
Operate the engine in gear for three minutes at each of the following: 1200 RPM, 2400 RPM, and 3000 RPM.
4.
Operate the engine in gear for three minutes at each of the following: 1500 RPM, 2800 RPM, and 3400 RPM.
5.
Operate the engine in gear for three minutes at each of the following: 1800 RPM, 3000 RPM, and maximum rated full
throttle RPM.
Engine Break‑In
20-Hour Break-In Period
IMPORTANT: The first 20 hours of operation are considered to be the engine break‑in period. Correct break‑in is essential to
obtain minimum oil consumption and maximum engine performance. During this break‑in period, observe the following rules:
Page 24
NOTICE
90-8M0133568
JUNE 2017
eng
Advertisement
Table of Contents
Troubleshooting
