Description

Daewoo D2366, D1146 Service Manual – 196-Page OEM Factory Shop Manual

If you’ve ever had a bus engine tear down grind to a halt because some aftermarket “manual” printed the wrong main bearing clearance, you already know why this Daewoo book exists. I’ve been turning wrenches for 28 years, ASE certified across the board, and I’ve sent more techs back to the parts counter than I can count because they trusted a third-party reprint that skipped the critical notes. The Daewoo D2366, D1146 Service Manual is the actual OEM document Daewoo Heavy Industries issued for their D2366, D2366T, D1146, and D1146T diesel engines. 196 pages. Factory illustrations. Factory torque values. Factory troubleshooting logic.

You don’t get that from a PDF scraped off a forum.

General Repair Instructions – Page 2

Daewoo opens with a section that tells you exactly how they expect the work to be done. “Use proper tools and special tools where specified.” Not “use whatever you can find.” They list the specific cotter pins, gaskets, O-rings, oil seals, lock washers, and self-lock nuts that must be replaced—not inspected, replaced. Page 2 also tells you to keep fixing bolts and nuts grouped by position because hardness and design vary. I’ve seen guys mix up bell housing bolts with water pump bolts and end up with a snapped fastener at 80 foot-pounds. This manual stops that before it starts.

Engine Assembly – Section 3

Section 3 of the manual covers the complete Engine assembly for all four variants: D1146, D1146T, D2366, D2366T. You get sectional views on page 15 and beyond that show exactly where every piston ring gap goes and which bearing tang faces the oil hole. For the Internal Combustion Engine fundamentals, this is the reference. Each sub-section includes removal, disassembly, inspection, reassembly, and installation steps. No guesswork—just the steps Daewoo technicians used on the assembly line.

Cooling System – Section 4: What a Real Manual Shows

I’ve seen aftermarket cooling system write-ups that tell you to “flush and fill” with no mention of thermostat opening temperature or coolant flow direction. Section 4 of the Daewoo manual gives you the cooling circuit diagram from page 19, plus the specific hose routing, water pump torque sequence, and the correct bleed procedure for the D1146 versus the D2366. Those two engines have different block heights and different water jacket configurations. If you swap parts across models without checking this section, you’ll overheat on the next grade.

Fuel System – Section 6: Injection Pump and Timing

Section 6 is the Fuel system chapter. It covers the injection pump, governor, injectors, and fuel lines. The manual includes the fuel system sectional view on page 17, showing the exact fuel flow path from tank to injector nozzle. It also lists the injection timing specifications in degrees before top dead center—different for each turbo variant. If you’re working on a bus with the D1146T, you need the turbo fuel settings, not the naturally aspirated ones. The manual also warns about air bleeding and high-pressure line torque. I’ve seen techs snap injection lines because they used a crow’s foot at the wrong angle. This book prevents that.

Engine Electrical – Section 7: Wiring and Starting System

Section 7 covers the Engine Electrical system: starter motor, alternator, glow plugs, and the wiring harness routing. Daewoo provides the circuit diagrams and the specific resistance values for glow plugs and starter solenoid checks. If you’re diagnosing a no-start on a cold morning, you don’t need to guess if the glow plug relay is pulling 12 volts—the manual tells you exactly what to measure and where. For Manual Transmission buses, the starter engagement specs differ from automatic variants; this manual accounts for that.

7 Systems Covered – Torque Specs and Data

The manual is divided into eight sections plus a supplement: General Information, Preventive Maintenance, Engine Assembly, Cooling System, Lubricating System, Fuel System, Engine Electrical, Turbocharger. Every section ends with a torque table and a list of special tools required. There’s no “torque to spec” without telling you the spec. Page 2–5 in the General Information section give you the main data and specifications, including bore, stroke, compression ratio, firing order, and valve clearance ranges. Need the charge pressure for the D1146T? It’s in the supplement.

Audience Fit – Who Needs This Manual

If you own a shop that services municipal buses, school buses, or heavy equipment powered by Daewoo D2366 or D1146 diesels, this manual belongs in your bay. It’s also for the fleet mechanic who doesn’t have time to sift through aftermarket summaries that leave out the safety warnings. Daewoo explicitly warns about using genuine parts, discarding used locking fasteners, and cleaning oil ports with compressed air before reassembly. That kind of instruction keeps a rebuild from turning into a warranty claim.

Related manuals you might need: Daewoo D1146 D1146TI DE08TIS Diesel Engine Shop Manual and Daewoo D1146 D1146TI DE08TIS 2001 Service Manual. Also check Daewoo D2366, D1146, D1146T, D2366T Service Manual – 197 Pages for an alternate edition.

Source Validity – OEM vs Aftermarket

This is not a reprint, not a compilation from three different machines, not a scanned and OCR’d mess with missing pages. AutoRepairManuals holds the largest collection of verified factory shop manuals in North America. The D2366/D1146 manual you’re looking at came from Daewoo Heavy Industries Ltd., Seoul, Korea. Every page has the Daewoo logo and the original publication number 65.99897-8019. You won’t find “generic replacement” torque values here. If a bolt needs 180 N·m, it says 180 N·m. If a seal must be replaced, it says replaced.

Does this manual cover the turbocharger version?

Yes. Section 8 is dedicated to the Turbocharger. It covers removal, inspection, and installation for the D1146T and D2366T models.

What torque specs are listed for main bearing cap bolts?

Main bearing cap torque values are provided in the Engine Assembly section. The manual includes both initial and final torque steps, plus the required angle of rotation where applicable. Do not guess these values—using the wrong torque can spin a bearing. The manual lists the exact Daewoo-specified values for each model variant, and it also notes which fasteners are single-use. Always check the supplement for special updates, as Daewoo occasionally revised torque specs after the initial print.

If you work on Daewoo bus engines, you need this manual. Access the Factory Manual and get the job done with the specs that actually match the engine on your stand.