Model 40Q50 Engine Service Standard - Mitsubishi 4DQ50 Service Manual

Model 4DQ
50
Eng n e
SeaiaT
Units
! Parts 1.AiI:
Checkup Items
ominal
Sett
ing
Limi
t of Repair'
Staniard (Clearance)
I
1
Max. speed
15-10qb higher than
Not below rated
I
I
rated speed
speed
1~
nOr above it
2 Min speed
70D-750r pm(Pneuma tic Not above SOO
Govl~
650-700q:m(Weehand.;,~
r.p.m.
3
Engine preformance (on bench)
4 CoEnpression pressure
!
Above 20q/cm
2
Not below
'(at 15D-200r.p.m. )
16kg/cm 2
~-4.IqVcm '\.at
1,oUO
Not oep:/W
5 Engine oi 1 pressure
r'r~~ ~~hi~er
2:~cm2
1.5 cm Z in ldl ino
O.
em z
General
I
...
..c:
CD
...
e
±3
6
Valve timing
-0
(crank angle)
~
""
...
...
'"
::I
-
; :;
7 Injection
star~ing
~e~igh
±10(erank
tlmUlg angle)
1
... II>
Bore
84"tP
+0.035-0
Cyl inder
8
+0.20
-
II> '"
out of round
-
~ess
than 0.015
~
-0 ""
bore
.:
~
Taper
-
ess than 0.015
"-»
"-
.:
n
-
""
Top
I
» ...
9
Strain Less than 0.05
0.2
o
<.>
surface
,
Projection of pistons +o.3!N-O.75
10 abO'ie cyl inder crank-
case top surface
Per iphery 111 Outer diam.
83.46P
-
-
!!
(0.2)
...
Top
2
+0.020-:0.040
""
0-
'"
Rings
and
Width
and
+0.015-0.035
(0.15)
c
12
2nC1
2
tIC 0
ring
standard
c
..
groO'les
clearance
oil
4
+0.015-0.035 (0.15)
I
'"
~
.-
S
P-
c
Piston pin
llUIer
and
outer diams
I
~
bosses and 13
and standa1d
25tP 0.011T-O (0.05)
piston pins
e earans
i
Weight
14
Wei~difference
±3gr
I
4 .g
,
PiStonS
I
- 80-