SERVICE MANUAL NUMBER 22
GENERAL INFORMATION
Page 1A-5
90-860074-–1 FEBRUARY 2002
Operation / Duty Cycle
It is the operator’s responsibility to operate within the following specified operational
capability, or duty cycle, as applicable to engine and installation:
NOTE:
Pleasure duty rating
applies to recreational planing craft used exclusively for pleasure and
recreation.
Light duty rating
applies to planing boats where the use of full rated power at maximum rated
rpm is limited (as stated above). Examples of Light Duty applications include, but are not
limited to: search and rescue craft, fast patrol boats, fire boats, dive boats, and limited
season fishing boats such as sport-fish charter boats. Application to common commercial
crafts having full-displacement or semi-displacement hulls exceeds the recommended
operational capability, or duty cycle.
IMPORTANT: Damage caused by improper application or failure to operate within the
operational capability, or duty cycle, will not be covered by the Mercury MerCruiser
Diesel Limited Warranty.
PLEASURE DUTY RATING / DUTY CYCLE
D2.8L D-Tronic and D4.2L D-Tronic
Specified Operating RPM Range 3600 - 3800
Wide Open Throttle (WOT)
Operation
Limited to short periods of time.
LIGHT DUTY RATING / DUTY CYCLE
D2.8L D-Tronic and D4.2L D-Tronic
Specified Operating RPM Range 3600-3800
Wide Open Throttle (WOT)
Operation
Limited to less that 10% of operating time.
Continuous cruising RPM
Limited to 90% or less of wide open throttle
RPM
Annual operating time Not to exceed 500 hours
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