SERVICE MANUAL NUMBER 25
GENERAL INFORMATION
Engine Serial Number Location
a
b
72975
a - Serial Number Plate
b - Starter Motor
Propeller Information
Refer to the “Propeller” section in appropriate Mercury MerCruiser Sterndrive Service
Manual, or order publication 90-8614492, “What You Should Know About Quicksilver
Propellers.”
Changing diameter, pitch or coupling of a propeller will affect engine rpm and boat
performance. 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 (WOT).
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 WOT 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 200 rpm will be achieved for each one inch 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 specified rpm limit,
will cause excessive wear on internal engine parts which will lead to premature
engine failure.
Index
90-861328--1
NOVEMBER 1999
Page 1A-5
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3 4.5 out of 5.0 based on 4 product reviews. This is great. I really like it. Thank you for providing this valuable opportunity for me.
if I can get the info that would be great
The information given is enoug .
In my opinion this is the best site on the net. Assisting people to do a job correctly and safely.