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
Valve spring
Free length
48.85
[1.92]
47.60
[1.87]
Perpendicularity
(distortion)
1.5° or less
Squareness of ends with
respect to center line
Set length/set force N
(kgf) [lbf]
43 [1.69]/
177 to 196
(18 to 20)
[40 to 44]
147
(15)
[33]
Inner valve spring (high-
speed option)
Free length
50.0
[1.9685]
49.0
[1.9291]
Perpendicularity
(distortion)
1.5° or less
Squareness of ends with
respect to center line
Set length/set force N
(kgf) [lbf]
38.5 [1.52]/
56.9 (5.8) [12.8]
38.5 [1.52]/
48.1 (4.9)
[10.8]
Rocker arm
Inside diameter of rocker
arm (bushing)
19
[0.75]
19.010 to 19.030
[0.7484 to 0.7492]
Diameter of rocker shaft
18.980 to 19.000
[0.7472 to 0.7480]
Clearance between
rocker arm and shaft
(0.010 to 0.050)
([0.0004 to 0.0020])
(0.070)
([0.0028])
Valve
pushrod
Runout 0.3 [0.012] or less Dial indicator reading
Crankshaft
Deflection
0.02 [0.0008] or
less
0.05
[0.0020]
Diameter of journal
65
[2.56]
64.965 to 64.985
[2.5577 to 2.5585]
Diameter of crankpin
58
[2.28]
57.955 to 57.970
[2.2817 to 2.2823]
Distance from center of
journal to center of
crankpin
47.5
[1.870]
47.46 to 47.54
[1.8685 to 1.8716]
Parallelism between
journal and crankpin
Runout: 0.01
[0.0004] or less
Out-of-round of journal
and crankpin
0.01 [0.0004] or
less
0.03
[0.0012]
Taper of journal and
crankpin
Fillet radius of journal
and crankpin
3
[0.12]
±0.2 [±0.008]
End play
(0.10 to 0.20)
([0.0039 to 0.0080])
(0.30)
([0.0118])
Group Inspection Point
Nominal
Value
Assembly
Standard
(Standard
Clearance)
Repair Limit
(Clearance)
Service
Limit
(Clearance)
Remark

Mitsubishi S4Q2 Specifications

General

Brand	Mitsubishi
Model	S4Q2
Category	Engine
Language	English