GENERAL INFORMATION
SERVICE MANUAL NUMBER 24
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 150 rpm will be achieved for each single inch of 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). Conversely, installing
a propeller, allowing engine to run above the specified rpm limit, will cause
excessive wear on internal engine parts which will lead to premature engine failure.
Water Testing New Engines
Use care during the first 20 hours of operation on new Mercury MerCruiser engines or
possible engine failure may occur. If a new engine has to be water-tested at full throttle
before the break-in period is complete, follow this procedure.
1.
2.
3.
Start engine and run at idle rpm until normal operating temperature is reached.
Run boat up on plane.
Advance engine rpm (in 200 rpm increments) until engine reaches its maximum rated
rpm.
IMPORTANT: Do not run at maximum rpm for more than 2 minutes.
Boat and Engine Performance
Boat Bottom
For maximum speed, a boat bottom should be as flat as possible in a fore-aft direction (longi-
tudinally) for approximately the last 5 ft (1.5 m).
a
72002
a - Critical Bottom Area
Index
Page 1A-6
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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