Mitsubishi diesel engines, Service Manual, Page: 201 / 219

ENGINE - INSPECTION / ADJUSTMENT, RUNNING-IN TRIAL AND PERFORMANCE TEST
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2. Running-in Trial
Whenever the engine is reassembled after overhaul,
run in the engine on a dynamometer. While the
engine is being run-in, also perform the inspections
listed below.
2.1 Starting the engine
(1)
Before starting the engine, check the levels of
coolant, engine oil and fuel. Also, bleed the
fuel and cooling systems of air.
(2) With fuel shut off, operate the starter for
approx. 10 seconds to crank the engine in order
to distribute oil throughout the engine.
(3)
Move the control lever slightly in the direction
of increased fuel delivery (moving the lever to
the full delivery position is not recommended).
Turn the starter key switch to the START
position to start the engine.
(4)
With the engine started, move the control lever
to the no-load, low idle position.
2.2 Inspecting the engine during running-in
While the engine is being run-in, check the
followings. If faulty, stop the engine. Locate
the cause and take appropriate actions to
eliminate it.
(1)
Oil pressure at the rated and low idle speeds
The oil pressure should be 0.29 to 0.39 MPa
(3.0 to 4.0 kgf/cm
2
) [42.07 to 56.57 psi] at the
rated speed, and 0.098 MPa (1.0 kgf/cm
2
)
[14.22 psi] or above at the low idle speed.
(2)
The coolant temperature, which should be 75
to 85
℃
(167 to 185
° Ｆ
).
(3) The temperature of engine oil in the oil pan,
which should be 60 to 95
℃
(140 to 194
° Ｆ
).
(4) There should be no leakages of oil, coolant or
fuel. Pay particular attention to the
turbocharger lubrication oil pipe connections.
(5)
Diesel knock should disappear as the coolant
temperature rises. Other than that, there
should be no noise.
(6) The exhaust gas for any abnormal color or
smell.
2.3 Running-in timetable
The following table shows the running-in
phases together with the relevant load and time
duration for each phase.
Running-in timetable
Engine speed
Load
(PS)
Time
(min)
1
2
3
4
5
6
Idle speed
1200
Rated speed
(varies depending on
engine specifications)
No load
No load
25 %
50 %
75 %
100 %
5
10
10
10
30
20
2.4 Inspection and adjustment after
running-in
(a)
Adjust the valve clearance
(b) Inspect the fuel injection timing
(c) Check the external bolts and nuts for
tightness