SERVICE MANUAL NUMBER 25
GENERAL INFORMATION
Water in Boat
When a boat loses performance, check bilge for water. Water can add considerable weight
to the boat, thereby decreasing the performance and handling.
Make certain that all drain passages are open for complete draining.
Elevation and Climate
Elevation has a very noticeable effect on the wide-open-throttle power of an engine. Since
air (containing oxygen) gets thinner as elevation increases, the engine begins to starve for
air. Humidity, barometric pressure and temperature do have a noticeable effect on the
density of air. Heat and humidity thin the air. This phenomenon can become particularly
apparent when an engine is propped out on a cool dry day in spring and later, on a hot, humid
day in August, does not have the same performance. See chart below.
Although some performance can be regained by dropping to a lower pitch propeller, the
basic problem still exists. The propeller is too large in diameter for the reduced power output.
The experienced marine dealer or a Quicksilver Propeller Repair Station can determine how
much diameter to remove from a lower-pitch propeller for specific high-elevation locations.
In some cases, a gear-ratio change to the drive unit to more reduction is possible and very
beneficial. It is a known fact that weather conditions exert a profound effect on power output
of internal combustion engines. Therefore, established horsepower ratings refer to the
power that the engine will produce at its rated rpm under a specific combination of weather
conditions.
72006
Index
90-861328--1
NOVEMBER 1999
Page 1A-9
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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