1-16
Service Information
4st 25/30 2022
5. Break-in Operation
Break-in operation is needed for the purpose of
smoothening the sliding surfaces between components
such as pistons and cylinder, piston rings, piston pins,
crankshaft, connecting rods, and intake and exhaust
valves.
Break-in
Operation Method
Trolling
or
idling
Throttle Opening
1/2
Hereinafter,
approximately
3,000 min
-1
(rpm)
Throttle Opening
3/4
Hereinafter,
approximately
4,000 min
-1
(rpm)
՚
Can be operated
fully open for about
1 minute every 10
minutes
՚
Can be operated
fully open for about
2 minute every 10
minutes
՚
Running at the
slowest possible
speed
Throttle Opening
3/4
Approximately
4,000 min
-1
(rpm)
Regular Operation
Time 0 10 minutes 2 hours 3 hours 10 hours
Break-in Operation…10 hours
6. Test Run
1. Start the engine and check if the gear can be shifted
smoothly.
2. After completing the warm-up operation, check the idle
revolution speed.
Dead Slow Revolution Speed:
850 min
-1
(rpm)
RPM
3. Shift the gear to the Forward (F) position and run at the
dead slow speed. (About 10 minutes)
Idle Revolution Speed:
850 min
-1
(rpm)
RPM
•
In order to apply an appropriate load on each
part during the break-in operation, run the test
with the propeller mounted.
•
During the break-in operation, change the
revolution speed while keeping it equal to or
below the specified revolution speed.
It is best to fluctuate the engine RPM (Target RPM or less) every 15-30 mins at each stage during the break in
procedure to allow for complete break in of outboard engine.
Running the outboard at for prolonged periods such as idling or one specific RPM is detrimental to the outboard and
could affect engine reliability and performance.
Tachometer:
P/N. 3AC-99010-0
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