Mitsubishi 4DQ5 Service Manual Page 91
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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BENCH TEST
When the engine
is
overhauled, it
is
advisable to conduct
the bench tests for checking the engine performance.
The purpose
of
bench tests
is
to
make sure that each
major component has been properly serviced.
1.
Visual inspection
Couple the engine to the dynamometer and inspect
as
follows:
(1) Starting the engine
(a) Check the amounts
of
cooling water, lubricating
oil and fuel oil. Bleed air out
of
the fuel system.
(f) The relationship between the load and running-
in period
is
as
follows:
After running-in the engine, check the
valve
clearance.
Engine speed
rpm
Load
PS
Time
min
1000 0
30
1500
7.5
30
2000
15
60
2500
20
60
(b) Place the starter switch in PREHEAT position to
preheat the combustion chambers. The glow plug
indicator lamp will glow red within
20 seconds.
If
not, check the preheating system for condition.
2. Perfonnance tests
(c) Place the starter switch in START position to
start the engine. Do not move the governor
con-
trollever
to
INCREASE position.
(d) After starting the engine, manipulate the
gover-
nor control lever to run the engine at idling speed.
(2) After starting the engine
Check the following items and repair
if
necessary.
(a) Abnormal oil pressure and oil leakage.
(b) Abnormal noise.
If
knocking
is
heard while water temperature
is
low and the noise dies away
as
water temperature
rises, the engine
is
in good condition.
(c) Color
of
exhaust gases.
(d) Leakage
of
cooling water.
( e) Leakage
of
fuel oil.
(f) Fuel injection.
(3) Running-in the engine
While running-in the engine, check the following
items and repair
if
necessary.
(a)
Oil
pressure (3
~
4 kg/cm
2
or 42.7
~
56.9 psi).
(b) Temperature
of
cooling water (75
~
85°C or
167
~
185°F).
(c) Temperature oflubricating oil
(60
~
70°C or
140
~
158°F in oil pan).
(d) Abnormal noise.
(e) Excessive blow-by, water leakage and oil leakage.
-
87-
(1) Test condition
The engine must be equipped with the air cleaner
and alternator.
(2) Test items
• No-load maximum speed test (governor set)
• Fuel injection quantity test (control rack set)
• No-load minimum speed test (idling speed set)
(3) Test procedures (with dynamometer pointer in
OFF position)
(a) No-load maximum speed test (governor set)
While the temperatures
of
cooling water and oil
are still high after engine running-in, set the
no-
load maximum speed.
(b) Fuel injection quantity test (control rack set)
The fuel injection quantity can be set by means
of
the governor fuel set lever. Loosening the set
screw at the top
of
the fuel set lever will increase
the fuel injection quantity, and vice versa.
(c)
Move
the control lever toward
LOW
SPEED posi-
tion and adjust the stop screw
to
set the idling
rpm
to
650 to 700.
(d) Tune-up
of
engine output
The diesel engine
output
is
based on the atmos-
pheric pressure and temperature. Therefore, the
output must be tuned up under standard
condi-
tions. Multiply the
output
measured by the factor.
This factor can be computed by the following
equation.
- 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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