Trim Tab; Break-In Operation - TOHATSU MFS25 Service Manual

Service Information

13) 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 _ as described
below, and then tighten the bolt to specified torque.
Trim tab bolt :
6 N·m ( 5 lb·ft ) 0.6 kg
Example of trim tab angle adjustment
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.
Change trim tab angle a little for each test run
and repeat the process several times until the
best position is found.

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.
Break-in Operation...10 hours
Time 0
Operation
1-14
10 minutes
1/2 of WOT or less at
Dead Slow or Idling
approximately 3,000
Running at the slowest
possible speed
1342 1342
1342
å
1
1 Trim Tab
2 Anti-cavitation Plate
3 Steering Pivot (Swivel Shaft)
2 hours
3/4 of WOT or less at
approximately 4,000 r/min
r/min
WOT run for approximately 1
minute can be included every
10 minutes of run.
1
3
1
2
3
3 hours 10 hours
3/4 of WOT at
Regular Operation
approximately 4,000
r/min
Short period WOT run
can be included.
∫
2
3
25/30 2006