Engine Break-In; Initial Break-In Procedure - Mercury MerCruiser D2.8L D-Tronic Service Manual

GENERAL INFORMATION

Engine Break-In

Initial Break-In Procedure

The following procedure must be used on new and rebuilt 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 starting procedure.
1. Refer to appropriate Starting, Shifting and Stopping section in the Operation,
Maintenance and Warranty Manual provided with the product and start the engine. Allow
the engine to idle until it has reached normal operating temperature.
2. Operate the engine in gear for 3 minutes at each of the following rpms: 1200 rpm, 2400
rpm and 3000 rpm.
3. Operate the engine in gear for 3 minutes at each of the following rpms: 1500 rpm, 2800
rpm and 3400 rpm.
4. Operate the engine in gear for 3 minutes at each of the following rpms: 1800 rpm, 3000
rpm and WOT.
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SERVICE MANUAL NUMBER 22
90-860064--1 FEBRUARY 2002