Break-In Operation; Test Run; Checks After Test Run - TOHATSU MD 70-90C2 Service Manual

5. Break-In Operation

Break-in operation is needed for the purpose of
smoothening sliding surfaces between components such
as pistons, piston rings, piston pins, cylinder, and gears.
Break-In Operation...10 Hours
Time 0
Method of break-
in operation
Run at the lowest speed.

6. Test Run

1. Start engine and check if gear shift can be made
smoothly.
2. After warming up the engine, read tachometer to check
idling engine speeds specified below.
Idling Engine Speeds :
RPM 700 · 800 · 900 r/min
Tachometer :
P/N. 3AC-99010-0
3. Shift gear into forward (F) and at idle slow for
approximately 10 minutes.
Trolling Engine Speeds :
RPM 700 · 800 · 900 r/min
4. Run at 3,000 r/min or half of WOT for initial 2 hours, then
at 4,000r/min or 3/4 of WOT 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.

7. Checks After Test Run

1. Check that no water is present in gear oil.
Gear oil turns to creamy white if mixed with water
invading into gear case.
2. Check that no fuel leaks in the cowl.
3. Check that no oil and water leak in the cowl and no water
is present in engine oil.
4. After test run, use flushing kit or flushing attachment and
fresh water to wash cooling water path by idling engine.
TLDI 75/90C2 2010
10 minutes
Throttle Opening: 1/2 of
Trolling or idling
WOT at approximately
3,000 r/min
▽
2 hours 3 hours
Throttle Opening: 3/4 of Throttle Opening: 3/4 of
WOT at approximately WOT at approximately
4,000 r/min
▽Running at WOT for one
minute every 10 minutes is Running at WOT for short
acceptable. period is acceptable.
a
1
1 High Tension Cable
10 hours
Regular operation
4,000 r/min
▽
N
a
1
1-15