Daewoo Doosan DE12 DE12T & DE12TI & DE12TIS DISEL ENGINE shop manual – PDF DOWNLOAD
DESCRIPTION:
Daewoo Doosan DE12 DE12T & DE12TI & DE12TIS DISEL ENGINE shop manual – PDF DOWNLOAD
- Daewoo reserves the right to improve our products in a continuing process to provide the best possible product to the market place. These improvements can be implemented at any time with no obligation to change materials on previously sold products.
- It is recommended that consumers periodically contact their distributors for recent documentation on purchased equipment. This documentation may include attachments and optional equipment that is not available in your machine’s package.
- Please call your .distributor for additional items that you may require. Illustrations used throughout this manual are used only as a representation of the actual piece of equipment, and may vary from the actual item
FOREWORD
- This manual has been prepared to help you use and maintain the DE series diesel engines (DE12, DE12T, DE12TI and DE12TIS) safely and correctly.
- These economical and high-performance diesel engines(6 cylinders, 4 strokes, in-line, direct injection type) have been designed and manufactured to be used for overland transport or industrial purpose.
- They meet all the requirements such as low noise, fuel economy, high engine speed and durability. Nonetheless, to obtain the best performance and long life of an engine, it is essential to operate it appropriately and to carry out periodic checks as instructed in this manual.
- You are requested to thoroughly read this manual from cover to cover and to acquaint yourself with all the information contained in this manual. All information, illustration and specifications continued in this literature are based on the latest product information available at the time of publication approval. The right is reserved to make changes at any time without notice.
- Please contact Daewoo dealer for the answers to any questions you may have about DE series engine’s features, operation or manuals.
1. General information
1.1. Engine characteristics
1.1.1. OMEGA combustion bowl
- The OMEGA combustion bowl is a unit designed to perform high-efficiency, low- emission combustion. As the rim around the combustion bowl port of the upper of the piston has been machined in a smaller size than the interior of the combustion bowl, strong swirl is produced in the combustion bowl and strong squish flow makes the fuel be mixed more sufficiently with air.
- Due to the application of OMEGA combustion system and optimal ultilization of intake and exhaust port configuration within the cylinder head, the DE12 series engines discharge a very low level of hazardous exhaust gases such as smoke, nitrogen oxide, hydrocarbon, or carbon monoxide and thus ensure high performance and low fuel consumption. EA2M1001 <Figure. 1-1 > OMEGA combustion bowl
1.1.2. Wastegated turbocharging system
- 1) What is the wastegated turbocharging system? Turbocharger is a system designed to pressurize the intake air to increase engine output and decrease fuel consumption by using the energy of exhaust gas discharged from the engine. However, the turbocharger has a weak point at low engine speed, its performance may drop, thus performance at low speed is relatively low.
- The WASTEGATED TURBOCHARGING SYSTEM is an up-to-date turbocharging system remedying such a defect, and the working principle is as follows: A small-sized high performance turbine is used to improve engine performance at low speeds. As high charging efficiency can be obtained even If a small amount of exhaust gas is present at low speed. On the other hand, if higher charging pressure is produced than what is present at high speed, fuel consumption increases.
- To correct this, part of exhaust gas is forced to be discharged into the exhaust manifold through the waste gate, not through the turbine. The waste gate is controlled by the ACTUATOR mounted in the turbocharger, and if the pressure in the turbocharger becomes higher than what is required for the engine, the waste gate is forced to open.
- 2) DE12T, DE12TI and DE12TIS engines are featured by the application of turbo chager so that the torque in low speeds can be increased by 30% or more, not only to create high performance, just from the time of starting off the which but also to greatly reduce fuel consumption. Compressed air outlet par Intake air Com Actuator EQM10031 Turbine port <Figure 1-3> Turbochager Exhaust gas outlet port Waste
TABLE OF CONTENTS:
Daewoo Doosan DE12 DE12T & DE12TI & DE12TIS DISEL ENGINE shop manual – PDF DOWNLOAD
1. General information •·············································································································· 1
1.1. Engine characteristics
1.2. Main data and specifications
1.3. Engine specification(’98 type)
1.4. Engine performance curve
1 .5. Exterior view of engine
2. Major maintenance •············································································································· 22
2.1. Preventive maintenance 2.2. Diagnostics and troubleshooting
for the engine
3. Disassembly and reassembly of major components •······················································ 37
3. 1 . Disassembly
3.2. Inspection
3.3. Reassembly
3.4. Breaking-in
4. Maintenance of major components •··················································································· 79
4.1. Cooling system
4.2. Lubricating system
4.3. Fuel system
4.4. Turbocharger
5. Scan pole diagnosis for DE12TIS •······················ …………………………………………………….. 142
5.1. Wire harness connection
5.2. System & Vehicle selection
5.3. Self-diagnosis(current)
5.4. Sensor data
5.5. Actuator test
5.6. Flight record
6. Maintenance specifications •······························································································ 154
6.1. Tightening torque 6.2. Maintenance specification table
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