Mitsubishi S4Q2 User Manual

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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
MAINTENANCE STANDARDS TABLE MAINTENANCE STANDARDS
Engine Main Parts
Camshaft
Deflection
0.02 [0.0008] or
less
0.05
[0.0020]
Straighten by cold working
or replace.
Lobe lift C
Inlet valve
A=
46.916
[1.84709]
6.684
[0.2631]
6.184
[0.2435]
Exhaust valve
A=
45.944
[1.80882]
7.344
[0.2891]
6.844
[0.2694]
Diameter of
journals
No. 1, 2
54
[2.13]
53.94 to 53.96
[2.1236 to 2.1244]
53.90
[2.1220]
No. 3
53
[2.09]
52.94 to 52.96
[2.0843 to 2.0850]
52.90
[2.0827]
End play
5
[0.20]
(0.10 to 0.25)
([0.0039 to 0.0098])
(0.30)
([0.0118])
Replace thrust plate.
Idler gear
Clearance between
shaft and bushing
(0.025 to 0.075)
([0.0010 to 0.0030])
(0.100)
([0.0039])
Replace bushing.
End play
(0.05 to 0.20)
([0.0020 to 0.0079])
(0.35)
([0.0138])
Replace thrust plate.
Fit (interference) of
shaft in crankcase bore
(-0.039 to -0.076)
([-0.0015 to -
0.0030])
Backlash
Crankshaft gear and
idler gear
(0.05 to 0.15)
([0.0020 to 0.0059])
(0.25)
([0.0098])
Replace gears.
Idler gear and camshaft
gear
Injection pump drive
gear and idler gear
(0.04 to 0.16)
([0.0016 to 0.0063])
Lubrication system
Oil pump
Clearance between
outer rotor and inner
rotor
(0.13 to 0.15)
([0.0051 to 0.0059])
(0.20)
([0.0079])
Clearance between
rotors and cover
(0.04 to 0.09)
([0.0016 to 0.0035])
(0.15)
([0.0059])
Clearance between
outer rotor and case
(0.200 to 0.275)
([0.0079 to 0.0108])
(0.500)
([0.0197])
Shaft diameter
13
[0.51]
12.985 to 13.000
[0.5112 to 0.5118]
Clearance between
shaft and case
(0.032 to 0.074)
([0.0013 to 0.0029])
Relief valve opening
pressure, kPa (kgf/cm
2
)
[psi]
343
(3.5)
[50]
343 ± 49
(3.5 ± 0.5)
[50 ± 7]
Cooling system
Thermostat
Temp. at which valve
starts opening
76.5 ± 1.5°C
[170 ± 2.7°F]
Temp. at which valve
lifts more than 8 [0.3]
90°C [194°F]
Group Inspection Point
Nominal
Value
Assembly
Standard
(Standard
Clearance)
Repair Limit
(Clearance)
Service
Limit
(Clearance)
Remark
+0.1
0.3–
A
B
C
+0.1
0.3
–

Mitsubishi S4Q2 Specifications

General

Brand	Mitsubishi
Model	S4Q2
Category	Engine
Language	English