1-13
1
4st 9.9/15/20 2008
5. Break-in Operation
Break-in operation is needed for the purpose of smoothening
sliding surfaces between components such as pistons and
cylinder, piston rings, piston pins, crank shaft, connecting
rods, and intake and exhaust valves.
12) Trim Tab
Adjustment of trim tab angle
After installing outboard motor on the boat, use trim tab to
achieve balance between port and starboard steering loads.
Loosen trim tab bolt, adjust angle of trim tab 1 as described
below, and then tighten the bolt to specified torque.
1 1
2 2
3
33
∫å
1 Trim Tab
2 Anti-cavitation Plate
3 Steering Pivot (Swivel Shaft)
Change trim tab angle a little for each test run
and repeat the process several times until the
best position is found.
Trim tab bolt :
6 N·m ( 5 lb·ft ) 0.6 kg
å If it is necessary to steer to port to make boat run straight
or if boat steers itself to port when steering is held
amidships, move trailing edge of trim tab to port side, or
∫ If it is necessary to steer to starboard to make boat run
straight or if boat steers itself to starboard when steering
is held amidships, move trailing edge of trim tab to
starboard side.
Example of trim tab angle adjustment
Operation Dead Slow or Idling
1/2 of WOT or less at
approximately 3,000
r/min
3/4 of WOT or less at
approximately 4,000 r/min
WOT run for approximately 1
minute can be included every
10 minutes of run.
Short period WOT run
can be included.
Running at the slowest
possible speed
3/4 of WOT at
approximately 4,000
r/min
Regular Operation
Time 0 10 minutes 2 hours 3 hours 10 hours
Break-in Operation…10 hours
E_MFS20C_ch01_090105.qxd 09.1.20 5:09 PM ページ 13
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