TROUBLESHOOTING
SERVICE MANUAL NUMBER 28
Performance Troubleshooting
Low WOT Engine RPM
Cause
Improper drive unit trim angle.
Damaged propeller.
Special Instructions
Properly adjust drive unit trim angle.
Repair or replace.
Water test boat using a lower pitch
propeller.
Improper propeller pitch.
Dirty or damaged boat bottom.
Drive installation too low on transom.
Clean and/or resurface boat bottom.
Contact boat manufacturer for
installation specifications.
Check for a hook in the boat bottom
by placing a straight edge, at least 6 ft.
(2m) long, under the bottom edge of
the transom. If a hook is found,
Permanent “hook” in boat bottom
(some boats are built with a slight
“hook” for correct boat performance).
contact the boat manufacturer.
Water test boat. Boat will perform
normally until hook develops at
high speed, then loss of rpm and
speed will occur. Contact boat
manufacturer.
“Power hook” or weak boat bottom.
High WOT Engine RPM
Cause
Special Instructions
Propeller ventilating.
Determine cause for ventilation.
Water test boat using a higher pitch
propeller.
Improper propeller pitch.
Propeller hub slipping.
Replace hub or replace propeller.
Contact boat manufacturer for
installation specifications.
Drive installation too high on transom.
Engine coupler hub spun.
Replace coupler.
Propeller Ventilating/Cavitating
Cause
Drive unit trimmed too high.
Incorrect propeller.
Special Instructions
Trim drive unit IN/DOWN.
Install correct propeller.
INDEX
Page 1C-8
90-863160 MAY 2000
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | MerCruiser Sterndrives 90-863160 |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(1 votes, average: 3 out of 3)
Marine readers have rated Mercury MerCruiser Bravo Outdrives Sterndrives Marine Engines Service Manual Number 28 3.0 out of 3.0 based on 1 product reviews. I could not find any mention of the seawater pump assembly.
Maybe I have the wrong unit