2021 OWNERS MANUAL / 328
NEW BOAT BREAK-IN
To ensure proper break-in and lubrication, boat owners should not
remove the factory break-in oil until after the initial ten (10) hours
of operation and before twenty-five (25) hours. At that time, an oil
change should be performed by an authorized Ilmor/MasterCraft
dealer. Failure to follow the break-in procedure exactly as stated
will void the engine warranty!
NOTE: Before operating the boat for the first time, you must read
the engine manufacturer’s manual completely in addition to this
Owner’s Manual!
Please follow the break-in procedure carefully. Close attention to
the following is very important:
Maintain the proper oil level
Until the piston rings, cylinder and other working internal parts are
thoroughly seated, oil consumption can be high and must be carefully
watched. (This continues to be important after break-in, as well).
Pay close attention to the gauges and
video screen(s)
It is important to stop the engine immediately if the gauges and/
or video screen(s) indicate a problem. Low oil pressure and
overheating are serious issues and require immediate attention.
Abnormal vibration or noises
These symptoms can be the first signs of trouble and should not
be ignored. Occasionally, hardware may work loose, mountings may
need to be tightened or the drive line may require attention.
Fuel, oil or water leaks
Leaks can pose a serious safety threat. While all new MasterCraft
boats are lake tested at the factory to check for leaks, it is still pos-
sible that one may occur. If a leak does occur, it is quite likely that it
will happen during the first few hours of operation.
Vary the engine speed
Never run the engine for more than three (3) minutes at any
constant RPM during the break-in period. Following this specific
instruction will assist in the proper break-in of rings and bearings.
Plane the boat quickly
Operating the boat at low speeds places an excessive load on the
engine. Plane quickly, then back down to a slower speed.
First Hours of Operation
The first hours of operation aect the engine and drive train more
2021MCOwnerManualFINAL.indd 328 8/26/20 1:54 PM
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