Break-In Procedure; The First 50 Hours - Universal M3-20A Operator's Manual

BREAK-IN PROCEDURE
THE FIRST 50 HOURS
Although your engine has experienced a minimum of one
hour of test operations to ensure accurate assemhly and
proper operation of all systems.
hrcak~in
lime is required.
The service life of your engine is dependent upon how the
engine is operated and serviced during its initial 50 hours of
usc.
Your new engine requires approximately 50 hours of initial
conditioning operation to hreak in cach moving part in order
to maximize the performance and service life of the engine.
Perform this conditioning carefully. keeping in mind the fol-
lowing:
1. Start the engine according to the Starting Procedure sec-
tion in this manual; run the engine at fast idle while
checking that all systems (raw water pump, oil pressure,
battery charging) arc functioning.
2. Allow the engine to warm up (preferably by running at fast
idle) until the water temperature gauge moves into the
130
o
-J40°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.
S.
Usc caulion nol
10
overload the engine.
The
presence
of a
gray
or
black exhaust, and the inahility
of
the engine
10
reach its full rated rpm, arc 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.
9
Breaking-in a new engine hasically involves seating the pis-
ton rings
10
the cylinder walls. This cannot be accomplished
hy long periods of running at iulc, nor hy early running at
full rpm. Idle running may glaze the eylinuer 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. produc-
ing similar results. Operate the engine in moderation during
the 50-hour break-in period. (Don', baby the engine_ bu! do
not abuse it.)
NOTE:
Allemptillg to reduce idle speed helow the minimum
shown may product' wisiahle ellgine operatioll and stalling.
NOTE:
The propeller should he eithc!r 2 or 3 Node. It should
allow the enRine to rf!ach iiS maximum rated rpm at full open
throttle undenvay ill forward gear to ensure the ami/ahility
of rated horsepower whell Ilet'ded.
NOTE:
See the TRANSMISSION section of this manual jor
hreak-ill illformation
Oil
your transmissio!l.