Sterndrive Unit 10-Hour Break-In Period; After Break-In Period; End Of First Season Checkup; 100 Hour Checkup - Mercury D4.2L Manual

CD608

Sterndrive Unit 10-Hour Break-In Period

It is especially important that the following procedure be used on new sterndrive units. This break-in procedure
allows the proper seating of drive unit gears and related components, which greatly reduces the likelihood of
problems.
1. Avoid full throttle starts.
2. DO NOT operate at any one constant speed for extended periods of time.
3. DO NOT exceed 75% of full throttle during the first 5 hours. During the next 5 hours, operate at intermittent
full throttle.
4. Drive unit should be shifted into forward gear a minimum of 10 times during break-in, with run-in time at
moderate rpm after each shift.
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
continuously (year-round operation), you should contact your dealer at the end of the first 100 hours of operation,
or once yearly, whichever occurs first.
CE299

100 Hour Checkup

It is a condition for the continuation of warranty, that the product be taken to an authorized MerCruiser service
dealer after the first 100 hours of operation, but no later than 150 hours, for cylinder head retorque service. A
copy of the dealer service work order must be kept, by the product owner, as evidence of compliance therewith.
32