SERVICE DATA
2-2
1. Maintenance service data
1.1 Engine general
1.2 Basic engine
Table 2-1 Maintenance service data table - Engine general Unit: mm [in.]
Inspection point Nominal Standard Limit Remark
Maximum rotation speed
(rated rotation speed used as reference)
(Varies depending on specification of
destination)
Adjusted by the governor.
Minimum rotation speed
Compression pressure (at 280 min
-1
)
2.7 MPa
{28 kgf/cm²}
[398 psi]
Not acceptable at or
below 2.2 MPa
{22 kgf/cm²}
[313 psi]
When oil and water tempera-
tures
at 20 to 30 °C
[68 to 86 °F]
Lubricating oil
pressure
Rotated speed
0.29 to 0.39 MPa
{3 to 4 kgf/cm²}
[42.7 to 56.9 psi]
Oil temperature
at 60 to 70 °C
[140 to 158 °F]
Low idling
0.10 MPa
{1.0kgf/cm²}
[14.2 psi]
Valve timing
Inlet open BTDC 18°
Values for checking valve
timing
Different from actual valve
opening and closing timing
Inlet open ABDC 46°
Exhaust open BBDC 46°
Exhaust open ATDC 18°
Valve clearance
Inlet 0.25 [0.0098]
When engine is cold
Exhaust 0.25 [0.0098]
Fuel injection timing (before TDC)
(Varies depending on
specification)
Table 2-2 Maintenance service data table - Basic engine(1 / 4) Unit mm [in.]
Inspection point Nominal Standard Limit Remark
Rocker arm
Rocker arm inside diameter
ø 12
[0.47]
12.013 to 12.035
[0.4730 to 0.4738]
Rocker shaft outside diameter
ø 12
[0.47]
11.470 to 11.984
[0.4516 to 0.4718]
Clearance between
rocker arm and rocker shaft
0.029 to 0.065
[0.0011 to 0.0026]
0.200
[0.0079]
Replace rocker arm
Valve
Valve stem
outside diameter
Inlet
ø 6.6
[0.260]
6.565 to 6.580
[0.2585 to 0.2591]
6.500
[0.2559]
Exhaust
ø 6.6
[0.260]
6.530 to 6.550
[0.2571 to 0.2579]
6.500
[0.2559]
Valve guide
inside diameter
Inlet
ø6.6
[0.260]
6.600 to 6.615
[0.2598 to 0.2604]
Exhaust
Clearance
between valve
stem and valve
guide
Inlet
0.020 to 0.050
[0.0008 to 0.0020]
0.100
[0.0039]
Replace valve and valve guide
Exhaust
0.050 to 0.085
[0.0020 to 0.0034]
0.150
[0.0059]
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