Breaking In Engine; Procedure For 4-Stroke Models - Yamaha F40D Owner's Manual

ECM01630
CAUTION:
During water testing, check the buoy-
G
ancy of the boat, at rest, with its maxi-
mum load. Check that the static water
level on the exhaust housing is low
enough to prevent water entry into the
power head when water rises due to
waves when the outboard is not run-
ning.
Incorrect engine height or obstructions
G
to the smooth flow of water (such as the
design or condition of the boat, or ac-
cessories such as transom ladders or
depth finder transducers) can create
airborne water spray while the boat is
cruising. If the motor is operated con-
tinuously in the presence of airborne
water spray, enough water could enter
the engine through the intake opening
on the cowling to cause severe engine
damage. Eliminate the cause of the air-
borne water spray.
EMU30173

Breaking in engine

Your new engine requires a period of break-
in to allow mating surfaces of moving parts to
wear in evenly. Correct break-in will help en-
sure proper performance and longer engine
life.
ECM00800
CAUTION:
Failure to follow the break-in procedure
could result in reduced engine life or
even severe engine damage.
EMU27083

Procedure for 4-stroke models

Your new engine requires a period of ten-
ZMU01762
hours break-in to allow mating surfaces of
moving parts to wear in evenly. Correct
break-in will help ensure proper performance
and longer engine life.
NOTE:
Failure to follow the break-in procedure
could result in reduced engine life or even
severe engine damage. Run the engine in
the water, under load (in gear with a propel-
ler installed) as follows. For ten hours for
breaking in engine avoid extended idling,
rough water and crowded areas.
1. For the first hour of operation:
Run the engine at varying speeds up to
2000 r/ min or approximately half throt-
tle.
2. For the second hour of operation:
Increase engine speed as much as nec-
essary to put the boat on plane (but
avoid full-throttle operation), then back
off on the throttle while keeping the boat
at a planing speed.
3. Remaining eight hours:
Run the engine at any speed. However,
avoid operating at full throttle for more
than 5 minutes at a time.
4. After the first 10 hours:
Operate the engine normally.
Operation
37