Description

Daewoo D100, D120 1999 Service Manual

If you’re working on a Daewoo D100 or D120 bus and relying on some third-party PDF that skips the torque table, you’re going to snap bolts. I’ve seen it happen. That manual won’t tell you the difference between a standard bolt torque and a main bearing cap. This factory Daewoo D100, D120 1999 Service Manual does. It’s 716 pages of OEM-fresh data, printed from the original press. No reprints, no scanned-in corrections from a copy machine.

Engine Assembly Inspection – What the Factory Procedure Covers

The manual dedicates a full chapter to Engine Assembly, starting with page references in the Index. You get the inspection sequence for major component parts: air compressor, crankshaft, camshaft assembly, cylinder block, cylinder head assembly. The factory procedure tells you the order. If you pull the cylinder head without checking the block deck for warpage first, you’re wasting time. The manual lists the inspection steps for piston assembly and rocker arm shaft assembly. These aren’t generic instructions – they’re written for the specific D1146 diesel engine used in these buses.

Don’t guess. The manual is 716 pages of factory data.

Fuel System: Injection Timing and Pump Specs

Inside the Fuel System chapter, you’ll find the adjustment procedures for injection quantity characteristics and injection timing. The manual walks you through setting the control rack ‘0’ position and running the supply pump test. The fuel injection pump section breaks down the camshaft, delivery valve assembly, plunger rotating mechanism, and the two-step helix plunger. If you’ve ever had a bus that won’t start after a pump rebuild, it’s because the timing wasn’t set per the factory spec. This manual gives you the exact injection timing adjustment procedure. That precision is why I trust OEM documentation over aftermarket guesswork. Want to see what a real diesel engine does? Read about the Internal Combustion Engine on Wikipedia.

Safety Warnings You Can’t Afford to Skip

The manual opens with a safety section that reads like it was written by someone who has seen a mechanic get crushed. It tells you to lower the forks or implements to the ground before any work. Use blocks – not jacks – to support the machine. Weights of components are noted. This isn’t a suggestion. I’ve pulled engines out of D100s. You lift a cylinder head without knowing the weight? That’s a hospital trip. The safety section also covers using proper lifting procedures, wearing protective glasses, and removing rings. That last one – I’ve seen a ring catch a spinning shaft. Don’t skip this.

7 Systems Covered in 716 Pages

Pages are organized into seven major system sections: General Information, Preventive Maintenance, Engine Assembly, Cooling System, Lubricating System, Fuel System, and Electrical System. Each section includes troubleshooting. For example, the Engine Troubleshooting table covers ‘Engine Lacks Power’, ‘Engine Noisy’, ‘Engine Runs Rough’, ‘Exhaust Smoke Excessive’, ‘Fuel Consumption Excessive’, ‘Hard-Starting’, and ‘Oil Consumption Excessive’. That’s the kind of diagnostic shortcut you don’t get from a manual that says ‘check this, check that’. The Predictive Maintenance section also includes specific inspection intervals for the engine – right down to the replacement intervals for the thermostat. That information is gold when you’re running a fleet.

Get the Right Torque Data from the Supplement

At the end of the manual, the Supplement section contains the Engine Tightening Torque tables. Page 2 is dedicated to torque specifications. You get injection pump system torque, major part tightening torque, and a standard bolt torque table. Need to know the torque for a cylinder head bolt? It’s in there. The maintenance specifications section gives you fluid capacities and clearances. I trust a factory torque table because it came from the same engineers who designed the engine. Aftermarket manuals guess. This one doesn’t. If you need later updates, check DAEWOO D100 D120 Service Manual Contents 2004.

Why the Manual Lists Every Bolt on the Engine

Look at the second index (SB2088E00). It lists every component from Air Cleaner Assembly to Radiator. That means when you’re reassembling, you can cross-check each part against the manual. The Fuel Injection Nozzle Assembly, Fuel Injection Pump, Fuel Pump, Fuel Strainer – they’re all there. The proper disassembly and reassembly procedures are provided for each. For a beginner, that’s the difference between a running engine and a pile of parts. For related model coverage, see Daewoo Musso Service Manual – Factory OEM Specs for 1465-Page Workbench and Daewoo 661LA, 662NA, 662LA 2000 Service Manual – Factory OEM. Also understand the transmission side with Manual Transmission.

FAQ

Does this manual cover the D120 model?

Yes. The manual specifically lists D100 and D120 models on the title page.

Are the torque values in imperial units?

Yes, all torque values are in foot-pounds where applicable. The Supplement on page 2 includes a Standard Bolt Torque table with both metric and imperial equivalents.

I need injection timing specs for the fuel injection pump. Where do I find them?

Inside the Fuel System chapter, under the Adjustment section. The manual provides the injection timing adjustment procedure, including setting the control rack to the ‘0’ position and running the supply pump test. The injection quantity characteristics table is also included, so you can set the pump to deliver the correct fuel volume at each speed. This is the exact data the factory technicians used to calibrate the D1146 diesel engine. Without it, you’re guessing – and guessing on a diesel injection pump leads to smoke, poor power, or a no-start condition.

What year was this manual published?

1999.

This is the manual you want on the bench when you tear into a Daewoo D100 or D120. It’s the same document the dealership techs used in 1999. No aftermarket guesswork, no missing pages. If you’re serious about doing the job right, Access the Factory Manual.