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CD753
Engine Break-In
INITIAL BREAK-IN PROCEDURE
It is especially important that the following procedure be used on new diesel engines. This break-in procedure
allows the proper seating of the pistons and rings, which greatly reduces the likelihood of problems.
IMPORTANT: It is recommended 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 engine does not start, wait 1 minute to allow the starter motor to cool; then, repeat start-
ing procedure.
1. Refer to appropriate Starting, Shifting and Stopping section and start engine. Allow engine to idle until it has
reached normal operating temperature.
2. Run engine in gear for 3 minutes at each of the following rpms: 1400 rpm, 2800 rpm and 3500 rpm.
3. Run engine in gear for 3 minutes at each of the following rpms: 1700 rpm, 3500 rpm and 4000 rpm.
4. Run engine in gear for 3 minutes at each of the following rpms: 2100 rpm, 3500 rpm and Maximum Rated
Full Throttle rpm.
CD828
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 engine below 1500 RPM for extended periods during the first 10 hours. During this period,
shift into gear as soon as possible after starting engine and advance throttle so that rpm is above 1500 (pro-
vided that conditions permit safe operation at this speed).
• DO NOT operate at any one constant speed for extended periods.
• DO NOT exceed 75% of full throttle during the first 10 hours except during engine Initial Break-In Procedure.
During the next 10 hours, occasional operation at full throttle (5 minutes at a time maximum) is permissible.
• AVOID full throttle acceleration from stopped position.
• DO NOT operate at full throttle until engine reaches normal operating temperature.
• OBSERVE INSTRUMENTS, if an abnormal reading occurs, stop engine immediately and determine cause.
• FREQUENTLY CHECK crankcase oil and sterndrive unit fluid levels. Add if necessary. It is normal for oil con-
sumption to be somewhat high during the break-in period.
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