BREAK-IN
PROCEDURE
THE
FIRST
50
HOURS
Although your engine has experienced a minimum
of
one
hour
of
test operations
to
ensure accurate assembly and
proper operation
of
all systems, break-in time is required.
The service life
of
your engine is dependent upon how the
engine is operated and serviced during its initial
50
hours
of
use.
Your new engine requires approximately 50 hours
of
initial
conditioning operation to break in each moving part in order
to maximize the performance and service life
of
the engine.
Perform this conditioning carefully, keeping in mind the
following:
1.
Start the engine according to the Starting Procedure
section in this manual; run the engine at fast idle while
checking that all systems (raw water pump, oil pressure,
battery charging) are functioning.
2.
Allow the engine to warm up (preferably by running at fast
idle) until the water temperature gauge moves into the
130° -140°F range.
3.
While using the vessel, run the engine at varying engine
rpms for the first 25 hours.
4. Avoid rapid acceleration, especially with a cold engine.
5. Use caution not to overload the engine. The presence
of
a
gray or black exhaust, and the inability
of
the engine to
reach its full rated rpm, are signs
of
an overload.
6. During the next 25 hours, the engine may be operated at
varying engine rpms, with short runs at full rated rpm.
Avoid prolonged idling during this break-in period.
10
Breaking-in a new engine basically involves seating the
piston rings to the cylinder walls. This cannot be accomplished
by long periods
of
running at idle, nor by early running at full
rpm. Idle running may glaze the cylinder walls, resulting in
excessive oil consumption and smoky operation. Excessive
speed
or
heavy over-loading, especially with a cold engine,
may cause scoring
of
the cylinder walls, producing similar
results. Operate the engine in moderation during the
50-hour
break-in period. (Don't baby the engine, but do not abuse it.)
RECOMMENDED
RPM
RANGES
MODEL
IDLE
CRUISE
MAXIMUM
RPM
RPM
RPM
M3-20B
1000-1200
2500-3000
3500-
3600
M25XPB
1000-1200
2000-2500
2900-
3000
M358
800-1000
2000-2500
2900-3000
M408
800-1000
2000-2500
2900-3000
M50B
800-1000
2000-2500
2700-2800
NOTE:
Attempting
to
reduce
idle
speed below
the
minimum
shown
may
produce unstable engine operation and
stalling.
NOTE:
The
propeller should
be
either 2 or 3
blade.
It should
allow
the
engine
to
reach
its
maximum rated
rpm
at full
open
throttle underway
in
forward gear
to
ensure
the
availability
of
rated horsepower when
needed.
NOTE:
See
the
TRANSMISSION section ofthis manual for
break-in information
on
your transmission.
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