Mercury D2.8L D-Tronic Especificaciones descargar pdf (Pagina 61)

ON THE WATER

SECTION 3

9CMD-4081850 / 90-860094030 SEPTEMBER 2003 Page 53

0040 and CE464

Propeller Selection

CAUTION

The installed propeller must allow the engine to run at the Rated Engine rpm at WOT

to avoid engine damage. Using a propeller that causes the engine to operate below

the Rated Engine rpm can cause piston and/or valve damage (even if the engine is

not operated at WOT). Conversely, using a propeller that allows engine to operate

above the specified Rated Engine rpm can increase fuel consumption and wear and

will not allow engine to produce its rated horsepower.

It is the responsibility of the boat manufacturer and/or the selling dealer to equip the power

package with the correct propellers.

IMPORTANT: The engines covered in this manual, depending upon the model, are

equipped with either a governor or a device that limits engine rpm. Be sure that

propeller being used does not allow engine to run against the governor or limiter, as

a significant loss in performance will result.

Select a propeller that will allow the engine power package to operate at the Rated Engine

rpm with a normal load.

NOTE: Use an accurate service tachometer to verify rpm.

Description

Rated Engine rpm

Engine rpm Limiter

Setting (Begins At:)

D4.2L 3600 3630 ± 20

D4.2L LD 3600 3650 ± 50

Sterndrive

D4.2L 230 3800 3875 ± 50

Sterndrive

Models

D2.8L D-Tronic 3800 3875 ± 50

D4.2L D-Tronic 3800 3875 ± 50

D4.2L 300 3900 3950 ± 50

If full throttle operation is below the Engine Rated rpm, the propeller must be changed to

prevent loss of performance and possible engine damage. On the other hand, operating an

engine above the Rated Engine rpm will cause higher than normal wear and/or damage.

After initial propeller selection, the following common problems may require that the

propeller be changed to a lower pitch:

• Warmer weather and greater humidity cause an rpm loss (not as significant on EDI

models).

• Operating in a higher elevation causes an rpm loss (not as significant on EDI models).

• Operating with a damaged propeller or dirty boat bottom causes an rpm loss.

• Operating with increased load (additional passengers, pulling skiers).

For better acceleration, such as is needed for water skiing, use the next lower pitch

propeller. Do not operate at full throttle when using the lower pitch propeller but not pulling

skiers.

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