Mitsubishi 4DQ3 User manual
SERVICE MANUAL
三菱ディーゼルエンジン
三菱ディーゼルエンジン
MITSUBISHI
DIESEL ENGINE
4DQ3, 4DQ30
MITSUBISHI HEAVY INDUSTRIES, LTD.
No. 5-1, Marunouchi, 2-chom Chiyoda-ku, Tokyo Japan
Phon : Tokyo (03) 212-3111 T l x: J22282, J22443 HISHIJU
SERVICE MANUAL
99609-50000
DEC 1985
Mitsubishi 4DQ3 and 4DQ30
Notes:
Valve Lash ( cold ) 0.25MM or .010"
Head Bolt Torque 87 Ft Lbs
Main Bolt Torque 62 Ft Lbs
Rod Bolt Torque 40 Ft Lbs
Part Number for complete gasket and seal set 3049451031 30494-51031
MAJOR DATA AND SPECIFICATIONS
3
X
2
INSPECTION AND REPAIR
Cylinder head
I
C
I
E
©
Vve id and valve sea ts
.'
)
�: 1 .
:�
Item
limit
°
13
1.2
±
� n
.l
e
! n
V i
(NOTE]
1.5°,
Cylinders
0
+0.035
Crankcase sket
t
1 "/
:,
2
. "
stons and piston rings
(1)
(3)
(4)
t
Connecng rod alignment and arings
(1)
C
f <o.os
e 100
A B
DI+ D2
2
2
[NOTE)
0
1 2
m
-0.0SS
•
(c) Grinding the crankshaft
The crankshaft journals and crankpins must
be
refinished
to
a dimension smaller by 0.100 to
0.120 mm (0.00394 to 0.00472 in.) than the
undersize
of
bearings to
be
used.
Example: If 0.50-mm (0.01969-in.) undersize
bearings
are
to be used:
The journals must be refinished to
65
-0.5 -(0.100 -0.120)
[2.55905 -0.01969 -
(0.00394-
0.00472 in.)]
The crankpins must be refinished
to
58 -0.5 -(0.100 -0.120)
[2.28346 -0.01969 -
(0.00394-
0.00472 in.)]
When
grinding the crankpins and journals,
be
sure to produce the same filler radius (shoulder
radiUS)
as
the original one. Too small a radius
of
fillet will result
in
fatigue failure
of
crankshaft
while too large a fillet radius
is
sure to cause the
bearing to ride on the radius and thereby to
result in a bearing failure.
Be
extremely careful
not to grind
off
the radius part beyond the
desired dimension.
An
over-ground radius part
can be corrected only by grinding
off
the
shoulder
face
and this,
if
effected, will present
problems in obtaining a proper end clearance.
Also check the crankpins and journals for hard-
ness. They should have a hardness
of
620 or
more in terms
of
Vickers Hardness Number.
If
necessary, re-harden the crankpins and journals,
and check them for cracks by conducting a
magnaflux (magnetic particle) test.
Specifications Unit:
mm
(in.)
Undersize Journals to
be
refinished to
0.25 !
64
75
-0.015
(25
92 -0.00059)
(0.0098) . . -0.035 . 4 1-0.00138
0.50
6450-
0.
015
(2
5393To.00059)
(0.0197) .
-0.035'
-0.00138
0.75
6425
-0.015
(2 52952
-0.00059
)
(0.0295) .
-0.035'
-0.00138
-30-
·
'�
'\, ,
0
J8800
Camaft
m
W·
D2
m
�gJ
jJ
m.
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1
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