Improper Full Throttle Engine Rpm; Rpm Too High; Rpm Too Low - Mercury MerCruiser D2.8L D-Tronic Service Manual

TROUBLESHOOTING

Improper Full Throttle Engine RPM

RPM Too High

1. Operation
2. Propeller
3. Boat
4. Engine coupler slipping

RPM Too Low

1. Operation
2. Propeller
2. Boat
Page 1C-6
Cause
Cause
SERVICE MANUAL NUMBER 22
Special Information
3. Unit trimmed out too far
1. Damaged; pitch too low; diameter too
small; propeller hub slipping
2. A. Water pickup or accessories
mounted too close to propeller (venti-
lation)
B. Keel located too close to propeller
and/or too deep in the water (ventila-
tion)
C. Drive installed too high on transom
D. Wrong gear ratio
Special Information
3. Unit trimmed in too far
1. Damaged; pitch too great; diameter
too great
2. A. Dirty or damaged bottom
B. Permanent or power hook in bot-
tom
C. False bottom full of water
D. Drive installed too low
E. Excessive boat load
90-860074--1 FEBRUARY 2002