20-Hour Break-In Period; After Break-In Period; End Of First Season Checkup - Mercury 350 Mag MPI Manual

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CA413

20-Hour Break-In Period

IMPORTANT: The first 20 hours of operation is the engine break-in period. Correct break-in is essential
to obtain minimum oil consumption and maximum engine performance. During this break-in period, the
following rules must be observed:
Do not operate below 1500 rpm for extended periods of time for first 10 hours. Shift into gear as soon as
possible after starting and advance throttle above 1500 rpm if conditions permit safe operation.
Do not operate at one speed consistently for extended periods.
Do not exceed 3/4 throttle during first 10 hours. During next 10 hours, occasional operation at full throttle is
permissible (5 minutes at a time maximum).
Avoid full throttle acceleration from IDLE speed.
Do not operate at full throttle until engine reaches normal operating temperature.
Frequently check crankcase oil level. Add oil if needed. It is normal for oil consumption to be high during
break-in period.
CA211

After Break-In Period

To help extend the life of your MerCruiser power package, the following recommendations should be considered;
Use a propeller that allows the engine to operate at or near the top of the maximum rpm range (See
"Specifications" section) when at full throttle with a normal boat load.
Operation at 3/4 throttle setting or lower is recommended. Refrain from prolonged operation at maximum (full
throttle) rpm.
CA414

End of First Season Checkup

At the end of the first season of operation, an Authorized MerCruiser Dealer should be contacted to discuss and/
or perform various scheduled maintenance items. If you are in an area where the product is operated continuous-
ly (year-round operation), you should contact your dealer at the end of the first 100 hours of operation, or once
yearly, whichever occurs first.
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