Maintenance Standards Table - Mitsubishi S4Q User Manual

MAINTENANCE STANDARDS TABLE

Group Inspection Point
Maximum speed, (no-load), rpm
Minimum speed, (no-load), rpm
Compression pressure, MPa
2
(kgf/cm ) [psi]
Engine oil pressure, MPa (kgf/
2
cm ) [psi]
Valve timing
Valve clearance (cold)
Fuel injection timing
Fan (water pump) and alternator
drive belt tension
Crankcase
Cylinder
160 / 174
Nominal
Value
Vary according to
specifications
2.94 (30) [427] at 150 to 200
0.2 to 0.4 (2 to 4) [28 to 57] at
rated rpm
0.1 (1) [14] or more at low idle
Inlet valves open
Inlet valves close
Exhaust valves open
Exhaust valves closed
Flatness of
surface gasket
88
Inside diameter
[3.46]
Circularity
Cylindricity
69
Inside diameter
[2.72]
Out-of-round
Concentricity
MAINTENANCE STANDARDS
35 MAINTENANCE
STANDARDS TABLE
Assembly
Standard Repair Limit
(Standard (Clearance)
Clearance)
2.55 (26) [370]
rpm
0.15 (1.5)
[21.3]
0.05 (0.5) [7]
speed
±3° (crank angle)
0.25 [0.0098]
BTDC 20°
13 [0.5], approx.
0.05 [0.0020] or 0.20
less [0.0079]
+0.035
88
0
+0.0014
[3.46 ]
0
0.01 [0.0004] or
less
0.015 [0.0006] or
less
+0.019
69
0
+0.0008
[2.72 ]
0
0.02 [0.0008] or
less
0.05 [0.0020] or
less
ENGLISH
MAINTENANCE STANDARDS
Service
Limit
(Clearance)
Adjust governor setting.
Oil and water temp.
20 to 30°C [68 to 86°F]
Oil temperature
70 to 90°C
[158 to 194°F]
BTDC 30°
ATDC 50°
BTDC 74°
ATDC 30°
Bolt inlet and exhaust valves.
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.
When belt is pushed inward
with 98 N (22 lbf) [10 kgf]
pressure exerted midway
between crankshaft and
alternator pulleys.
Regrind if warpage is minor.
Increase bore to 0.25 [0.0098]
or 0.50 [0.0197] oversize and
use oversize piston.
With main bearing cap
installed (bolts tightened).
Service Manual Mitsubishi SQ-Series diesel engines
Unit: mm [in.]
Remark
Version 08/2004