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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
MAINTENANCE STANDARDS TABLE MAINTENANCE STANDARDS
MAINTENANCE STANDARDS
35 MAINTENANCE
STANDARDS TABLE
Unit: mm [in.]
Group Inspection Point
Nominal
Value
Assembly
Standard
(Standard
Clearance)
Repair Limit
(Clearance)
Service
Limit
(Clearance)
Remark
General
Maximum speed, (no-load), rpm
Vary according to
specifications
Adjust governor setting.
Minimum speed, (no-load), rpm
Compression pressure, MPa
(kgf/cm
2
) [psi]
2.94 (30) [427] at 150 to 200
rpm
2.55 (26) [370]
Oil and water temp.
20 to 30°C [68 to 86°F]
Engine oil pressure, MPa (kgf/
cm
2
) [psi]
0.2 to 0.4 (2 to 4) [28 to 57] at
rated rpm
0.15 (1.5)
[21.3]
Oil temperature
70 to 90°C
[158 to 194°F]
0.1 (1) [14] or more at low idle
speed
0.05 (0.5) [7]
Valve timing
Inlet valves open
Inlet valves close
Exhaust valves open
Exhaust valves closed
BTDC 30°
ATDC 50°
BTDC 74°
ATDC 30°
±3° (crank angle)
Valve clearance (cold) 0.25 [0.0098] Bolt inlet and exhaust valves.
Fuel injection timing BTDC 20°
Standard injection timing is
indicated here. The timing for
each model of engine varies
according to its specification.
Be sure to verify the timing by
referring to the specifications
of each model.
Fan (water pump) and alternator
drive belt tension
13 [0.5], approx.
When belt is pushed inward
with 98 N (22 lbf) [10 kgf]
pressure exerted midway
between crankshaft and
alternator pulleys.
Engine Main Parts
Crankcase
Flatness of
surface gasket
0.05 [0.0020] or
less
0.20
[0.0079]
Regrind if warpage is minor.
Cylinder
Inside diameter
88
[3.46]
88
[3.46 ]
Increase bore to 0.25 [0.0098]
or 0.50 [0.0197] oversize and
use oversize piston.
Circularity
0.01 [0.0004] or
less
Cylindricity
0.015 [0.0006] or
less
Main bearing
Bore for main bearing
Inside diameter
69
[2.72]
69
[2.72 ]
With main bearing cap
installed (bolts tightened).
Out-of-round
0.02 [0.0008] or
less
Concentricity
0.05 [0.0020] or
less
+0.035
0
+0.0014
0
+0.019
0
+0.0008
0
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