SERVICE MANUAL NUMBER 26
GENERAL INFORMATION
Engine Serial Number Locations
a
b
71559
a - Serial Number Plate
b - Starter Motor
Propeller Information
Refer to the “Propeller” section in appropriate MerCruiser Sterndrive Service Manual, or
order publication 90-86144, “What You Should Know About Quicksilver Propellers.”
Changing diameter, pitch or coupling of a propeller will affect engine rpm and boat perfor-
mance. The blade configuration also will affect performance. Two like propellers, same pitch
and diameter, from two different manufacturers also will perform differently.
It is the responsibility of the boat manufacturer and/or selling dealer to equip the boat with
the correct propeller to allow the engine to operate within its specified rpm range at
wide-open-throttle (W.O.T.).
Because of the many variables of boat design and operation, only testing will determine the
best propeller for the particular application.
To test for correct propeller, operate boat (with an average load onboard) at W.O.T. and
check rpm with an accurate tachometer. Engine rpm should be near top of the specified
range so that, under heavy load, engine speed will not fall below specifications.
If engine exceeds the specified rpm, an increase in pitch and/or diameter is required.
If engine is below rated rpm, a decrease in pitch and/or diameter is required.
Normally, a change of approximately 400 rpm will be achieved for each single pitch change
of a propeller.
CAUTION
If a propeller is installed that does not allow engine rpm to reach the specified
full-throttle rpm range, the engine will “labor” and will not produce full power.
Operation under this condition will cause excessive fuel consumption, engine
overheating and possible piston damage (due to detonation). On the other hand,
installation of a propeller that allows engine to run above the specifiedrpm limit will
cause excessive wear on internal engine parts which will lead to premature engine
failure.
Index
90-861329--1
MARCH 1999
Page 1A-5
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 CID |
| 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 |
(6 votes, average: 5 out of 5)
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Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke