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CA24
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 mini-
mum oil consumption and maximum engine performance. Dur-
ing 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 op-
eration.
• 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 min-
utes at a time maximum).
• Avoid full throttle acceleration from IDLE speed.
• Do not operate at full throttle until engine reaches normal operat-
ing temperature.
• Frequently check crankcase oil level. Add oil if needed. It is nor-
mal for oil consumption to be high during break-in period.
• After 20-hour break-in period, drain crankcase oil and replace oil
filter (see MAINTENANCE). Fill crankcase with correct oil (see
SPECIFICATIONS).
CA211
After Break-In Period
To help extend the life of your MerCruiser power package, the follow-
ing 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.
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