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S12U
Mitsubishi S12U User Manual
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Chap
ter 1
BASIC SAFETY PRECAUTIONS
1-9
W
a
rning labels
fig.
1-1 W
arni
ng for
flywhe
el
ent
angl
ement
fig.1-
2 Warning for movin
g parts
fig.1-3
W
arning
for oil
mist
fig.1-4 Ca
ution for
footing
fig
.1-5 C
auti
on for
elect
ric shoc
k
fig.1-6
W
arnin
g for rotating parts
fig
.1-7 C
auti
on fo
r burns
fig.1-8
W
a
rning fo
r rotating parts
fig.1-9
Cauti
on for refer
ring to
manual
fig.1-10
Caution fo
r burns
22
24
Table of Contents
Default Chapter
4
Limited Warranty
4
Important Information
5
Table of Contents
9
Chapter 1 BASIC SAFETY PRECAUTIONS
15
Warning Fire and Explosion
15
Inspection and Maintenance
16
Warning be Careful of Burns
17
Lifting Engine Carefully
18
Handle Battery Carefully
19
Stopping Engine
20
Cleaner
21
Caution about Warning Labels
22
Fig.1-3 Warning for Oil Mist
23
Fig.1-4 Caution for Footing
23
Fig.1-6 Warning for Rotating Parts
23
Fig.1-7 Caution for Burns
23
Fig.1-8 Warning for Rotating Parts
23
Fig.1-9 Caution for Referring to Manual
23
Fig.1-10 Caution for Burns
23
Warning Labels
23
Chapter 2
25
NAME of PARTS Engine External Diagrams
25
S12U Left View
25
S12U Right View
25
Fig.2-1 S12U Engine Left View
25
Fig.2-2 S12U Engine Right View
25
S16U Left View
26
S16U Right View
26
Fig.2-3 S16U Engine Left View
26
Fig.2-4 S16U Engine Right View
26
Equipment and Instrument
27
Starting and Shutdown Devices
27
Start Switch
27
Stop Switch
27
Start Lever
27
Manual Stop Lever
27
Fig.2-5 Start Switch and Stop Switch
27
Instruments
28
Tachometer
28
Hour Meter
28
Oil Pressure Gage
28
Oil Temperature Gage
28
Jacket Coolant Temperature Gage
28
Oil Cooler Coolant Temperature Gage
28
Air Cooler Coolant Temperature Gage
28
Jacket Coolant Pressure Gage
28
Oil Cooler Coolant Pressure Gage
28
Engine Protection Devices
29
Low Oil Pressure Alarm
29
High Coolant Temperature Alarm
29
Oil Filter Clog Alarm
29
Overspeed Alarm
29
Using Turning Gear
30
Chapter 3
31
Operation
31
Preparation for Operation of New or Overhauled Engine
31
Fuel System
31
Pouring Fuel
31
Bleeding Fuel System
32
Bleeding Air from Fuel Filters (Wire-Element Type)
32
Bleeding Air from Fuel Feed Pipe
33
Lubricating System
34
Pouring Engine Oil
34
Cooling System
35
Pouring Coolant
35
Electrical Systems
36
Checking Battery
36
Electrolyte Level
36
Checking Specific Gravity of Electrolyte
36
Checking Loosened Wire
36
Table 3-1 Specific Gravity of Electrolyte
36
Checking Valves for Open/Closed Position
37
Test Operation
37
Normal Engine Operation
38
Preparations for Operation (Pre-Start Inspection)
38
External Inspection
38
Cleaning Fuel Filters (Wire-Element Type)
38
Checking Fuel Level in Tank
39
Draining Water from Fuel Tank
39
Checking Engine Oil Level
39
Checking Coolant Level
40
Inspection of Air Cleaner Indicator
40
Draining Water from Air Starter Tank
41
Inspection of Air Tank Air Pressure
41
Starting
42
Warming-Up Operation
42
Inspection of Oil Pressure
42
External Inspection During Warming-Up
42
Operation
43
Inspection During Operation
43
Table 3-2 Data for Rated Speed
43
Stopping
44
Emergency Stop
44
Inspection after Stopping
44
Chapter 4
45
Maintenance
45
Cautions Concerning Maintenance
45
Stop the Engine before Checking or Adding Fuel, Oil or Coolant
45
Handle Electrolyte Carefully
45
Handle LLC Carefully
45
Always Wear Protective Gear
45
Use Recommended Fuel, Engine Oil and Coolant
45
Perform All Specified Pre-Start Inspections and Periodic Inspections
45
Use Only Genuine Mitsubishi Parts
45
Fuel
46
Recommended Fuel
46
Handling Fuel
46
Table 4-2 Fuel Use Limit Property Guideline
47
Engine Oil
48
Recommended Engine Oil
48
Selection of Oil Viscosity
48
Handling Engine Oil
49
Coolant
50
Recommended Coolant
50
Long Life Coolant (LLC)
50
Table 4-3 Water Quality Standards
50
Recommended LLC
51
Features and Performance of Recommended LLC
51
Maintenance of LLC
51
Replacement Timing of LLC
51
LLC Concentration
51
Table 4-4 Recommended Brands of LLC
51
Table 4-5 Recommended LLC Concentration
51
Importance of LLC
52
Characteristics of LLC Additive and Important Notes
52
Examples of Abnormalities Caused by LLC
52
Pitting on Iron Parts
52
Corrosion of Aluminum Parts
52
Pitting and Clogging of Radiator
52
Filters
53
Electrical Parts
53
Cautions in Operating Engine in Cold Weather Season
54
Fuel
54
Engine Oil
54
Coolant
54
Battery
54
Maintenance after Cold Season
54
Chapter 5
55
PERIODIC MAINTENANCE CHART How to Use Periodic Maintenance Chart
55
Periodic Maintenance Chart for Regular-Use Engine
55
Periodic Maintenance Chart for Emergency Engine
55
Periodic Maintenance Chart for General-Purpose Engine
55
General Definition of Regular-Use Engine, Emergency Engine and General-Purpose Engine
56
General Definition of Regular-Use Engine
56
General Definition of Emergency Engine
56
General Definition of General-Purpose Engine
56
Periodic Maintenance Chart for Engine in Regular Use
57
Table 5-1 Periodic Maintenance Chart for Engine in
57
Periodic Maintenance Chart for Emergency Engine
62
Table 5-2 Periodic Maintenance Chart for Emergency
62
Periodic Maintenance Chart for General-Purpose Power Supply Engine
67
Table 5-3 Periodic Maintenance Chart for General
67
Chapter 6
73
Periodic Inspection and Maintenance Procedures
73
Fuel System
73
Draining Water from Fuel Filters (Wire-Element Type)
73
Draining Water from Fuel Filters (Center-Bolt Type)
73
Draining Water from Fuel Tank
74
Cleaning Inside of Fuel Filters (Wire-Element Type)
74
Changing Fuel Filters (Center-Bolt Type)
75
Changing Fuel Filters (Cartridge Type)
76
Changing Fuel Filters with Engine Stop
76
Changing Fuel Filters While Engine in Operation
77
Inspection of Fuel Control Linkage Ball
78
Joints
78
Lubricating System
79
Filter
79
Draining Engine Oil
79
Changing Oil Filters (S12U)
79
Changing Oil Filters (Swithover Type) (S12U)
80
Changing Oil Filters with Engine Stop
80
Changing Oil Filters While Engine in Operation
80
Changing Oil Filters (Swithover Type) (S16U)
81
Changing Oil Filters with Engine Stop
81
Changing Oil Filters While Engine in Operation
81
Changing Bypass Oil Filter
82
Pouring Engine Oil
83
Inspection of Engine Oil Leakage after Replacing Oil Filter
83
Water
83
Analysis of Engine Oil Properties
84
Engine Oil Sampling Tool Sets and Ordering Procedure
84
Table 6-1 Engine Oil Sampling Tool Sets
84
Cooling System
85
Checking LLC Concentration
85
Inspection and Replacement of Zinc Rods
85
Changing Coolant
86
Draining Coolant
86
Cleaning the Cooling System
86
Pouring Coolant
87
Inlet and Exhaust Systems
88
Inspection and Draining Water of Exhaust Pipes and Exhaust Muffler
88
Draining Water from Air Cooler Chamber and Inspection for Water Leakage
88
Cleaning, Inspection and Changing Pre-Cleaner
88
Cleaning, Inspecting and Changing Air Cleaner Element
89
Air Starter System
90
Draining Water and Cleaning Air Starter Strainer
90
Draining Water from Air Starter Compressor
90
Chapter 7
91
Long-Term Storage
91
Storing Engine in Non-Operable Condition for more than 3 Months
91
Preparation for Storage
91
Maintenance During Storage
91
Using Engine after Storage
91
Table 7-1 Recommended Rust-Preventive Oil and Corrosion Inhibitor
91
Storing Engine in Operable Condition for more than 3 Months
92
Operating Engine for Maintenance Purposes
92
Chapter 8
93
Transportation
93
Lifting Engine Carefully
93
Chapter 9
95
TROUBLESHOOTING General Precautions
95
Contact a Mitsubishi Dealer for Repair
95
Service
95
Examination before Work
95
Notes Regarding Contamination
95
Notes Regarding Parts Handling
95
Work Safety
95
Conditions Required for Proper Engine Operation
96
Table 9-1 Conditions Required for Proper Engine
96
Troubleshooting
97
Engine Turns, but It Does Not Start
97
Table 9-2 Engine Turns, but It Does Not Start
97
Engine Does Not Turn
99
Table 9-3 Engine Does Not Turn
99
Engine Output Is Low
100
Table 9-4 Engine Output Is Low
100
Engine Knocks
101
Table 9-5 Engine Knocks
101
Engine Produces Large Amount of Smoke While in Operation
102
Engine Operates at High Speed and Does Not Stop
102
Table 9-6 Engine Produces Large Amount of Smoke While
102
Table 9-7 Engine Operates at High Speed and Does Not
102
Malfunction of Lubricating System
103
Table 9-8 Malfunction of Lubrication System
103
Chapter 10
105
Main Specifications
105
Table 10-1 Main Specifications Table
105
5
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Mitsubishi S12U Specifications
General
Brand
Mitsubishi
Model
S12U
Category
Engine
Language
English
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