Mitsubishi 4DQ5 Service Manual Page 65
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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(3) Remove nozzle tip (3), distance piece (4), pres-
sure pin (5), spring (6) and washer
(7)
from nozzle
holder.
(4)
All
the parts disassembled should be washed
in
clean kerosene and dried with compressed air. Decar-
bon the nozzles removed with a wooden scraper and
clean them thoroughly in gasoline.
5-3 Inspection
(1) Needle valve and nozzle body
(a) Immerse needle valve and nozzle body in a pool
of
clean kerosene, insert the
valve
into the
body, and move the
valve
back and forth to be
sure that the sliding contact
is
smooth without
evidencing any excessive clearance. The injec-
tion nozzle
as
a whole must be replaced
if
the
fit
is
found defective_
(b) Visually examine the nozzle body
with
a magn.
fying glass having a power
of
4
or
5.
(c) Inspect the needle
valve
for distortion
or
dam-
age
at its seating part and for wear
of
its end
face in contact
with
the pressure pin.
(d) Poor seating contact may be corrected,
if
the
defective condition
is
not
advanced
too
far, by
lapping the
valve
against the seat with a coat
of
clean lube oil applied
to
the seating faces.
If
this does
not
help, the injection nozzle must be
replaced.
(2) Nozzle holder and distance
piece
Check the fit between nozzle holder and distance
piece. Determine the quality
of
the fit from
contact patterns obtained with the use
of
red lead
paste: defective fit will be evidenced by an abnor-
mally high rate
of
return oil (leak-ofQ flow.
(3) Pressure spring and
pressure pin
(a) Replace any pressure spring broken, cracked
or
otherwise defective,
or
out
of
square. Inspect
each spring for these defects.
(b) Inspect each pressure pin for wear at its end
faces, one for pressure spring and the other for
needle
valve:
(4)
Leak-off pipe packing
If
the packing
is
found in deteriorated condition,
replace
it.
-61-
- SERVICE 1
- 1. Major 5
- GENERAL 5
- 1-2 Right-hand side view 6
- Longitudinal sectional view 7
- Transverse sectional view 8
- "til 9
- '1:l 10
- '0 10
- ~ 13500 11
- DISASSEMBLY 12
- (1) and disconnect injection 13
- (3) by loosening union 13
- (1) and remove 13
- (1) and oil ring (2) 17
- (b) Remove 18
- (f) Remove thermostat (5) 18
- Ii nder head 19
- (0.0020) 20
- Valve guides 21
- 'Valve springs 23
- Removing ridge 24
- 1.0. Remarks 25
- Pistons and piston rings 26
- (4) Piston 27
- (7) Piston pin bosses 28
- "c" and 29
- "c" 29
- ~rankpin 30
- (1) Journals 32
- 5393To.00059) 34
- (0.0012 36
- (0.00787) 36
- Camshaft 36
- W' 37
- +0.10 (hole) 38
- ",:e" 39
- (0.0020 40
- REASSEMBLY 41
- 1-Compression rings 42
- Driving 43
- Precombustion-chamber side 44
- (1) and two woodruff keys 45
- (1) with 47
- 48
- (lb-ft) 49
- CYLINDER 50
- ASSEMBLY 50
- (1) into the tappets 51
- I----------=~ 53
- -~-==II 53
- J.00059 54
- (NOTES] 55
- COOLING SYSTEM 56
- ± 2°C (169.7 ± 3.6°F) 56
- (1) Remove pump cover (2) 57
- Reassembly 59
- (1) and install 59
- Fuel circuit 60
- Priming the fuel system 61
- (1) Bringing 62
- (1) Filter 63
- ®--_" 64
- Leak-off pipe packing 65
- 01 this 66
- (3) Seating tightness 67
- 6. Fuel feed pump 68
- Priming 70
- 600 injection-pump rpm 71
- 1.S kg/cm 71
- Tabulated data 73
- (IT) mounted on control 74
- 1. General 75
- Starter 76
- ± 0.3 V 78
- _..JI~'--_Fuse 79
- Dz permits the 80
- (1), and remove starter 81
- 7. Inspection and adjustment 85
- Ammeter 87
- -"' 88
- Alternator 89
- (1) Starting the engine 91
- (f) Fuel injection 91
- (1) Test condition 91
- 760 - 11.4 92
- -fJiGQ' 93
- ( 1.73) 95
- ± 2.21) 95
- I Warpage on 96
- @' 99
- 'U 100
- ""' 101
- "" 102
- (0.130~0.154) 103
- I Replace 104
- '" 105
- SEALANT APPLICATION DATA 106
- Important bolts and nuts 107
- General bolts and 108
- "t 109
- ~"~i 110
- 2·lnstaller 111
- 3-Cran kease 111
- 1-Rod 3-Camshaft bushing 112
- 2-Adaptor 112
- TROUBLESHOOTING 114
- .::;;"' 115
- - - - 0 116
- 0 - - 116
- - 0 - - 116
- -" 117
- '85 120
- Printed in Japan 120
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