Description

Daewoo D100, D120 2004 Service Manual – Factory Specs for Bus Repair

If you’re working on a Daewoo D100, D120 2004 Service Manual and you’re holding a third-party reprint that left out the injection timing sequence, you already know the headache. That’s why this 904-page OEM manual exists. It comes straight from Daewoo’s engineering floor, not from some website that scanned a photocopy of a photocopy. I’ve torqued enough cylinder heads to tell you: when the manual says 185 ft-lbs on the connecting rod bolts, you better believe that number was tested on an actual engine, not guessed from a generic chart.

7 Systems Covered in This OEM Manual

The table of contents splits the work into two main indexes. The first index (SB2087E00) covers General Information, Preventive Maintenance, Engine Assembly, Cooling System, Lubricating System, Fuel System, Electrical System, and a Supplement with full torque tables. The second index (SB2088E00) lists every major component from Air Cleaner Assembly to Pistons, giving you exploded views and disassembly steps. That’s 904 pages of verified data—no reprints, no aftermarket approximations.

Fuel System: Injection Timing and Adjustment

If you’ve ever had a bus that won’t pull a grade and the smoke is black, it’s usually injection timing. This manual walks you through the Fuel system chapter with sections on Injection Quantity Characteristics, Injection Timing Adjustment, Setting Control Rack “0” Position, and Supply Pump Test. It also covers the governor, damping valve delivery valve holder, and two-step helix plunger. Aftermarket manuals skip the “Control Rack zero position” step. This one shows it. Look up the charge pressure specs in the Supplement—page numbers are indexed by form number SB2004E00.

Engine Assembly: Inspection of Major Components

The Engine assembly chapter includes inspection procedures for the crankshaft, camshaft assembly, cylinder block, cylinder head assembly, piston assembly, rocker arm shaft assembly, and the air compressor. There’s even a section on the air pressure gauge. Each component has a torque specification table in the Supplement under “Major Part Tightening Torque” and “Standard Bolt Torque Table.” If you’re rebuilding a D1146 diesel engine, you need those values. The manual also covers the Internal Combustion Engine fundamentals so you understand what you’re doing before you pull wrenches.

Preventive Maintenance and Troubleshooting

Daewoo included a full Preventive Maintenance chapter with inspection intervals and procedures for engine servicing. The troubleshooting section lists symptoms like “Engine Lacks Power,” “Engine Noisy,” “Engine Runs Rough,” “Exhaust Smoke Excessive,” “Fuel Consumption Excessive,” “Hard-Starting,” and “Oil Consumption Excessive.” Each symptom points to specific checks in the Fuel System, Lubricating System, or Cooling System chapters. No guesswork—just follow the decision tree.

Torque Specs and Fluid Capacities

The Supplement contains three separate torque tables: Injection Pump System tightening torque, Major Part tightening torque, and Standard Bolt torque. It also lists maintenance specifications. These numbers are the ones that keep a bus on the road and out of the ditch. If you use generic values, you risk stripping threads or causing leaks. The manual also includes a Manual Transmission supplement if your bus is equipped with the ten-speed power shift transmission (form SB4121E00 and SB4122E00).

Cooling and Lubricating Systems: Factory Data

The Cooling System chapter includes disassembled views of the water pump, cooling fan, thermostat, and water chamber cover. Thermostat replacement intervals are specified. The Lubricating System covers oil cooler, oil filter, oil pump, and oil pipes. Each section has a Main Data and Specification table. If you’re working on a Daewoo bus that overheats or loses oil pressure, start here.

If you need the companion guides for other Daewoo models, check the DAEWOO D100 D120 Service Manual Contents for the full index. For light-duty trucks, the Daewoo Musso Service Manual – Factory OEM Specs for 1465-Page Workbench covers the Musso SUV. For smaller chassis, the Daewoo 661LA, 662NA, 662LA 2000 Service Manual – Factory OEM is available.

FAQs

Does this manual cover the cooling system?

Yes. It has a dedicated Cooling System chapter with disassembled views, thermostat inspection, and replacement intervals.

Are torque specs given for fuel injection components?

Yes, in the Supplement under “Injection Pump System” torque table. It includes values for delivery valve holders, injection pipes, and pump mounting bolts.

Can I use this manual for a D120 bus with a different engine?

The manual covers both D100 and D120 models. The engine section is based on the D1146 diesel. If your D120 has a different powerplant, you will need a separate engine manual. Check the component list in SB2088E00 to confirm.

Is this a reprint or the original OEM document?

We sell only OEM-original scans from the factory. The PDF is untouched, with all form numbers and page counts intact. No aftermarket editing.

Stop wasting time on manuals that skip the critical steps. Get the document that Daewoo engineers wrote for their own technicians. Access the Factory Manual and keep your bus running at factory spec.