Mitsubishi diesel engines - Service Standards Table

SERVICE STANDARDS
1 - 12
1. Service Standards Table
Unit: mm (in.)
Group
Item
Nominal
value
Standard value Limit Remarks
Max. speed
(based on the rated speed)
2700
+30
-10
min
-1
Min. speed
1000±25 min
-1
Compression pressure
(at 290 min
-1
)
2.9 MPa (30 kgf/cm
2
)
[421 psi]
or above
2.6 MPa
(27 kgf/cm
2
)
[377 psi]
or less
Both oil and coolant
temperatures at 20 to
30℃ (68 to 86°Ｆ)
Rated speed
0.29 to 0.39 MPa
(3.0 to 4.0 kgf/cm
2
)
[42.07 to 56.57 psi]
Engine oil
pressure
Low idle speed
0.098 MPa
(1.0 kgf/cm
2
)
[14.22 psi]
Oil temperature at
60 to 95℃ (140 to
194°Ｆ)
Inlet valve
open
BTDC 15
°
Inlet valve
closed
ABDC 41
°
Exhaust valve
open
BBDC 54
°
Valve timing [with
2 mm (0.079 in.)
clearance on the
valve side; cold
engine]
Exhaust valve
closed
ATD C 10
°
The theoretical valve
timing figures for
inspection vary from
the actual valve
timing.
Inlet valve 0.25 (0.01)
Valve clearance
Exhaust valve 0.25 (0.01)
Cold engine
Engine general
Fuel injection timing (BTDC)
17°
Rocker arm inner diameter
φ19
(0.749)
18.910 to 18.930
(0.7450 to 0.7458)
―
Rocker shaft diameter
φ19
(0.749)
18.880 to 18.898
(0.7438 to 0.7445)
―
Rocker
Arm-to-shaft clearance
(oil clearance)
0.012 to 0.050
(0.0004
to 0.0019)
0.200
(0.0079)
Replace rocker arm.
Inlet
φ6.6
(0.260)
6.565 to 6.580
(0.2586 to 0.2592)
6.500
(0.256)
Valve stem diameter
Exhaust
φ6.6
(0.260)
6.530 to 6.550
(0.2572 to 0.2580)
6.500
(0.256)
Inlet
φ6.6
(0.260)
6.600 to 6.615
(0.2600 to 0.2606)
Valve guide inner
diameter
Exhaust
φ6.6
(0.260)
6.600 to 6.615
(0.2600 to 0.2606)
Inlet
0.020 to 0.050
(0.0008 to 0.0020)
0.100
(0.004)
Val ve
Valve stem-to-guide
clearance
Exhaust
0.050 to 0.085
(0.0020 to 0.0033)
0.150
(0.006)
Replace valve and
valve guide.
Valve seat angle
45
°
Valve head sinkage 0
0.25 to 0.75
(0.0098 to 0.0295)
1.5
(0.0591)
Valve seat width
1.6
(0.063)
1.30 to 1.80
(0.0512 to 0.0709)
2.5
(0.0985)
Valve head margin
1.5
(0.0591)
1.35 to 1.65
(0.0531 to 0.0650)
0.5
(0.0197)
Engine main parts
Valve seat and valve
Installed valve guide protrusion
10
(0.394)
9.5 to 10.5
(0.3743 to 0.4137)
―
Valve seat width
Val v e
seat
angle
Va lv e
head
mar
g
in
Valve head
sinka
g
e