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
Piston
Outside diameter (at
skirt)
Standard
87.970
[3.4634]
87.955 to 87.985
[3.4628 to 3.4640]
87.770
[3.4555]
0.25 [0.0098]
oversize
88.220
[3.4732]
88.205 to 88.235
[3.4726 to 3.4738]
88.020
[3.4654]
0.50 [0.0197]
oversize
88.470
[3.4831]
88.455 to 88.485
[3.4825 to 3.4837]
88.270
[3.4752]
Protrusion
0.13 to 0.60
[0.0051 to 0.0236]
Check bearing clearance.
Weight difference in one
engine
5 g [0.2 oz] or less
Piston ring
Clearance between
groove and ring
No. 1 ring
(0.060 to 0.100)
([0.0024 to 0.0039])
(0.200)
([0.0079])
Replace piston rings if
service limit is not
exceeded. Replace piston if
service limit is exceeded.
No. 2 ring
(0.045 to 0.080)
([0.0018 to 0.0032])
(0.150)
([0.0059])
Oil ring
(0.025 to 0.065)
([0.0010 to 0.0026])
Clearance between
end of piston ring
No. 1, No. 2
ring
(0.25 to 0.40)
([0.0098 to 0.0157])
(1.50)
([0.0591])
O-ring
(0.30 to 0.50)
([0.0118 to 0.0197])
Piston pin
Diameter
28
[1.10]
27.994 to 28.000
[1.1021 to 1.1024]
Clearance between pin
and bore
0.000 to 0.016
[0.0000 to 0.0006]
0.050
[0.0020]
Replace pin if service limit is
nog exceeded. Replace
piston if service limit is
exceeded.
Clearance between pin
and bushing
(0.020 to 0.051)
([0.0008 to 0.0020])
(0.080)
([0.0032])
Replace pin or bushing.
Ream if necessary.
Connecting rod
Inside diameter of
bushing
28
[1.10]
28.020 to 28.045
[1.1031 to 1.1041]
Bend and twist
0.05/100 [0.0020/
3.94] or less
0.15/100
[0.0059/3.94]
Clearance between
crankpin and
connecting rod bearing
(oil clearance)
(0.03 to 0.09)
([0.0012 to 0.0035])
(0.20)
([0.0079])
Thrust clearance of
connecting rod big-end
(End play)
(0.15 to 0.35)
([0.0059 to 0.0138])
(0.50)
([0.020])
Replace connecting rod.
Weight difference in one
engine
10 g [0.35 oz] or
less
Flywheel
Flatness
0.15 [0.0059] or
less
0.50
[0.0197]
Face runout
0.15 [0.0059] or
less

Mitsubishi S4Q2 Specifications

General

Brand	Mitsubishi
Model	S4Q2
Category	Engine
Language	English