Description

Daewoo DB58, DB58T, DB58TI Workshop Manual

I’ve been an ASE Master Technician for 28 years, and I can tell you the fastest way to ruin a day is bolting a head on a Daewoo DB58 with the wrong torque sequence. Aftermarket manuals skip steps – they’ll give you a single number for “cylinder head bolts” and call it done. That’s how you get a blown gasket at 20,000 miles. This Daewoo DB58, DB58T, DB58TI Workshop Manual is the factory document, 126 pages of OEM procedure you can trust. Not a copy, not a reprint. Daewoo printed this for their service centers. If you’re rebuilding a DB58, DB58T, or DB58TI diesel engine, you need the original torque specs from section 1.3 and the engine assembly step-by-step from section 2. I’ve seen techs try to use generic bus manuals and end up with oil leaks because they torqued the main bearing caps to the wrong value. This manual eliminates that guesswork.

Torque Specifications in Section 1.3

Section 1.3 of the manual is where you’ll find the torque specifications for every critical fastener on the Daewoo DB58, DB58T, and DB58TI. This includes main bearing cap bolts, connecting rod nuts, cylinder head bolts, flywheel bolts, and the injection pump mounting bolts. Each value is given in both foot-pounds and Newton-meters, with a reference to the tightening sequence where applicable. I’ve seen aftermarket manuals list a single number for “cylinder head bolts” without mentioning the angle-tighten step or the sequence – that’s how you warp a head. This factory document gives you the exact sequence diagram on the same page. Don’t skip to the torque wrench until you’ve read that diagram. 126 pages of OEM data, and this one page can save you an engine rebuild.

Engine Assembly and Disassembly – Section 2 Procedure

Section 2 spans from page 31 to page 95 – 64 pages dedicated to pulling the engine apart and putting it back together. It covers external parts disassembly (2.1), key components disassembly (2.2), inspection and repair (2.3), and reassembly (2.4). Each step has a required tool list. For example, to remove the cylinder head, you’ll need a special puller – the manual shows you Daewoo’s specific tool number. Don’t improvise; the manual gives you the correct method. Follow the order exactly, especially for the timing gear alignment marks. One misaligned mark and the engine won’t run. The manual shows the alignment marks in section 2.2.

Lubrication System: What the Manual Covers

Chapter 3 covers the lubrication system – oil pump, oil cooler, and general description. The oil pump gear backlash spec is critical; if it’s out of tolerance you’ll lose oil pressure. Page 96 starts this section. The manual includes a table of oil pump specifications and the recommended lubricants from section 1.7. Use the listed oil viscosity or risk premature wear. The oil cooler removal procedure is also here, with the correct O-ring sizes listed. Don’t reuse old O-rings – the manual warns against it.

Does This Manual Cover the Fuel System?

Yes, section 5 starts on page 110. It covers the fuel filter, injection nozzle, and general description. If you’re replacing an injection nozzle on a DB58T, the manual gives you the opening pressure specification and the installation torque for the nozzle holder. Don’t rely on aftermarket data; I’ve seen incorrect nozzle torque values cause leaks that lead to engine fires. This manual’s fuel system section is the correct source. The fuel filter replacement interval is also listed in the maintenance schedule on page 1.5.

8 Major Systems Documented

The manual covers 8 systems: General (specifications, torque, lubricants), Engine assembly, Lubrication, Cooling, Fuel, Engine electricals (starter motor and alternator), Turbo charger, and troubleshooting. That’s the complete scope for the Daewoo DB58, DB58T, and DB58TI diesel engine. Every system has its own section with step-by-step instructions. You don’t need to flip between different manuals; it’s all here in 126 pages. The troubleshooting section (chapter 8) lists common causes of trouble – low compression, overheating, oil leaks – and the diagnostic steps to isolate them. That’s something aftermarket manuals never include properly.

If you need additional reference material, check the Daewoo DB58 Series Diesel Engine Service Manual or the Daewoo DB58 Series Diesel Engine 2003 Operators Manual – Section: Appendix. For a direct link to this product, see Daewoo DB58, DB58T, DB58TI Workshop Manual – 126 Pages of OEM Specs. The DB58 is a four-cylinder Internal Combustion Engine commonly used in buses. If your bus has a Manual Transmission, this engine manual still applies – the drivetrain is separate.

Frequently Asked Questions

Does this manual include wiring diagrams for the electrical system?

No. The manual covers engine electricals – starter and alternator only. No chassis wiring.

What torque value does the manual give for the cylinder head bolts?

See section 1.3. The manual lists torque for each bolt type – main bearing caps, connecting rods, cylinder head. The values are given in both Nm and ft-lb. For the cylinder head, the tightening sequence is shown in a diagram on the same page. I’ve worked on dozens of DB58 engines, and using the correct torque spec with a calibrated wrench makes the difference between a reliable rebuild and a comeback. Always refer to the manual’s table before tightening.

Is this a scanned copy or a reprint?

It is a PDF of the original OEM workshop manual from Daewoo. Not a copy, not a reprint. The document ID is 65.99892-8026A.

Can I use this manual for a Daewoo DB58TI that was built in 2005?

The manual covers the DB58, DB58T, and DB58TI models as manufactured. Daewoo states they can implement improvements without obligation. For engines built after the manual’s publication, some details may have changed. However, the core service procedures for disassembly, torque specs, and lubrication remain valid. Use this as your baseline, then check for any service bulletins.

Get this manual on your tablet or print it out. I keep a binder in the shop because I don’t trust WiFi when I’m up to my elbows in diesel oil. Access the Factory Manual and start with the correct data.