Break-In Operation; Test Run - TOHATSU MFS 4 Service Manual

Service Information

5. Break-in Operation

1. 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

6. Test Run

1. Start engine and check if gear shift can be moved smoothly.
2. After completing warm-up operation, check idling revolution
speed.
Idling Revolution Speed : - Neutral
1,300 r/min
RPM
Tachometer :
P/N. 3AC-99010-0
3. 3.Shift gear into forward (F) and run dead slow for
approximately 10 minutes.
Dead Slow Revolution Speed :
RPM 1,150 r/min
4. Run at 2,000 r/min or half of WOT or less for initial 2 hours,
then at 3,000 r/min or 3/4 of WOT or less for 1 hour.
5. Check that shifting into reverse (R) will not tilt up outboard
motor and allow water to run into boat.
Complete test run during break-in operation.
1-12
10 minutes
1/2 of WOT or less at
Dead Slow or Idling
approximately 3,000
Running at the slowest
possible speed
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 High Tension Cord
3 hours 10 hours
3/4 of WOT at
Regular Operation
approximately 4,000
r/min
Short period WOT run
can be included.
1
4st 4/5/6 2011