Mitsubishi S4Q2 User Manual

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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
MAINTENANCE STANDARDS TABLE
ENGLISH
MAINTENANCE STANDARDS
Group Inspection Point
Nominal
Value
Assembly
Standard
(Standard
Clearance)
Repair Limit
(Clearance)
Service
Limit
(Clearance)
Remark
Engine Main Parts
Main bearing
Oil clearance (clearance
between crankshaft
journal and main
bearing)
(0.035 to 0.100)
([0.0014 to 0.0039])
(0.200)
([0.0079])
Width of thrust journals
23
[0.91]
22.979 to 23.000
[0.9047 to 0.9055]
Tappet bore
Inside diameter
14
[0.55]
14.000 to 14.018
[0.5512 to 0.5519]
14.100
[0.5551]
Clearance between
tappet and bore
(0.016 to 0.052)
([0.0006 to 0.0021])
(0.080)
([0.0032])
Bore in crankcase for camshaft
Inside diameter of
bushing (No. 1)
54
[2.13]
54.030 to 54.050
[2.1272 to 2.1280]
61GT only
Inside
diameter of
bores for
camshaft
No. 1 and
No. 2
54
[2.13]
54.030 to 54.050
[2.1272 to 2.1280]
No. 3
53
[2.09]
53.030 to 53.050
[2.0878 to 2.0886]
Out-of-round
0.02 [0.0008] or
less
Concentricity
0.05 [0.0020] or
less
Clearance between
camshaft and journal
(0.07 to 0.11)
([0.0028 to 0.0043])
(0.15)
([0.0059])
Cylinder head
Warpage of bottom face
0.05 [0.0020] or
less
0.20
[0.0079]
Regrind if warpage is minor
Compressed thickness
of gasket
1.3
[0.05]
1.27 to 1.35
[0.0500 to 0.0531]
Valves and valve guide
Valve stem
diameter
Inlet valve
8
[0.315]
7.940 to 7.955
[0.3126 to 0.3132]
7.900
[0.3110]
Exhaust
valve
7.920 to 7.940
[0.3118 to 0.3126]
7.850
[0.3091]
Clearance
between
stem and
guide
Inlet valve
(0.065 to 0.095)
([0.0026 to 0.0037])
(0.200)
([0.0079])
Exhaust
valve
(0.080 to 0.115)
([0.0032 to 0.0045])
Height to top of valve
guide
15.5
[0.61]
15.1 to 15.6
[0.5945 to 0.6142]
Valve seat
Angle 30°
Valve sinkage
0.8
[0.03]
0.7 to 0.9
[0.0276 to 0.0354]
1.3
[0.0512]
Width
1.18
[0.05]
1.04 to 1.32
[0.0409 to 0.0520]
1.6
[0.0630]
Valve margin
1.70
[0.0669]
Up to 1.20
[0.0472] by
refacing
Se
a
t widt
h
Valve seat
angle
Valve
sinkage
Valve
margin

Mitsubishi S4Q2 Specifications

General

Brand	Mitsubishi
Model	S4Q2
Category	Engine
Language	English