Mitsubishi 4DQ5 Service Manual Page 72
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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7.
Fuel
injection
pump
7-Delivery valve spring
8-Delivery valve
9-Alr
vent
screw
, -Bearing cover
2-Tapered
roller bearing
3-Governor housing
4-Tapered
roller bearing
5-Screw plug
, O-Delivery valve seat gasket
l'
-Tappet
6-Pump housing
'2-Cover
The pump body
is
an aluminum alloy casting
IDCl
houses all the moving parts
of
pump elements and
the camshaft. The governor housing
is
attached
to
one end
of
the pump body.
The camshaft
is
supported
by
two tapered
roDer
bearings. Like the engine camshaft, it has four
cams, one for each pump element, and
is
driYen
from the crankshaft through a train
of
gears
arranged for a gear ratio
of
2
to
1.
For
each two
rotations
of
crankshaft, the injection pump
cam-
shaft rotates once.
The pump element consists
of
a plunger, barrel
(cylinder), tappet, plunger spring, control pinion
and spring-loaded delivery valve. The tappet
rides
on the cam and pushes the plunger upward for
each rotation
of
camshaft.
As
the plunger rises,
the fuel in the barrel becomes compressed and
is
forced
out
through the delivery valve into the
injection
pipe_
The upward plunger stroke, effec-
tive in compressing or pressurizing the fuel,
is
variable, and
is
varied by means
of
the control
rack and pinion in the manner to be explained
later.
-68-
, 3-Camshaft
'4-Drain
plug
, 5-Del ivery valve holder
, 6-Delivery valve seat
17-CYlinder
,a-Plunger
, 9-Control rack
20-Upper spring seat
2'
-Control sleeve
22-Spring
23-Lower spring
seat
24-Shim
- 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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