Description

Doosan DB58, DB58S, DB58T, DB58TI, DB58TIS Operators Manual – Factory OEM

You’ve got a Doosan DB58 series engine in the bay. It’s a marine diesel – 6-cylinder, 4-stroke, direct injection. Aftermarket manuals? I’ve seen them. They skip the valve clearance procedure, fudge the torque sequence, and leave you guessing on the cooling system bleed. This 203-page Operators Manual from Doosan is the real thing. Factory specs. No reprint. No copy.

7 Engine Systems Covered in This Manual

The table of contents lays it out straight. You get dedicated sections on the Fuel system (section 2.7), Cooling system (2.8), Lubrication system (2.5), Air cleaner (2.6), Intercooler (2.10), Turbocharger (5.4), and the complete Electrical Equipment chapter (3.4). Each one includes the factory checkpoints – not some generic write-up. If you need to bleed the fuel system after a filter change, section 4.13 walks it step by step. Want to know the proper coolant mix for winter operation? Section 4.4 and 4.6 cover it. This isn’t a skim-through document; it’s 203 pages of verified data.

Valve Clearance and Adjustment at Sections 2.11 and 4.7

Valve adjustment on the DB58TIS is a critical job. Get it wrong and you’re chasing misfires or burning a valve. The manual gives you the cold clearance spec and the procedure with the engine at the right position. Section 2.11 covers the theory and measurement method. Section 4.7 repeats it in the commissioning context because this engine gets adjusted both during initial setup and after break-in. No aftermarket manual I’ve seen reproduces the exact sequence from Doosan’s engineering team. You get it here.

Why Factory Specs Beat Aftermarket for the DB58TIS

I’ve torqued more head bolts than most techs have had lunches. The difference between an OEM manual and a third-party reprint is measurable in stripped threads and comebacks. This document comes direct from Doosan Infracore – the same company that built the engine. The injection timing values, the V-belt tension range, the cylinder compression pressure limits (section 2.12) – all verified against the production line. The appendix includes a Special Tool List so you know exactly which puller or holder to use. You don’t get that from a PDF scan of a photocopy. You get it from the factory print.

Does This Manual Cover the Fuel System?

Yes – and then some. Section 2.7 gives you the system layout and component locations. Section 4.10 dives into the fuel injection pump itself, including the timing procedure. Section 4.11 covers the feed pump strainer cleaning. Section 4.12 mentions the separator. Section 4.13 is the air bleeding sequence – critical after any fuel service. If you’re swapping an injection nozzle (section 2.13), the manual tells you the pop pressure and spray pattern check. That’s the kind of detail that keeps a marine engine running when you’re far from a dealer.

Get the Right Torque Data – Cylinder Head Bolts

Section 4.9 – Tightening the cylinder head bolts – is where most mistakes happen. The manual gives you the tightening sequence and the final torque value. It also tells you the step pattern if the engine uses angle-tightening. I’ve seen guys guess at it and end up with a blown head gasket on a sea trial. Don’t be that guy. Use the factory spec. The same section also covers the injection timing adjustment (4.8) and the V-belt tension check (2.9). Every torque value in this manual is in imperial units as printed by Doosan for the North American market.

Does this manual include the DB58S and DB58TI models?

Yes.

What if I need the complete technical manual with overhaul specs?

The Operators Manual covers operation, maintenance, and basic adjustments. For full engine disassembly and rebuild procedures, you want the separate Technical Manual. Check the related manuals below for that document. This 203-page book gives you everything you need for daily operation, scheduled maintenance, and common repairs – including the valve clearance, injection timing, cooling system service, and troubleshooting from section 2.16. It’s the manual you keep in the toolbox for every oil change and every tune-up.

This is the same manual that goes into the glovebox of a new Doosan marine engine. If you work on a DB58, DB58S, DB58T, DB58TI, or DB58TIS, you need the factory document. Pair it with the Doosan DB58 Series Diesel Engine Technical Manual for deeper work. For related equipment, see the Doosan DL200, DL200TC 2006 Operators Manual – Factory OEM and the Doosan DL300 2006 Operators Manual – Factory Spec Safety & Operation. If you’re also handling the drivetrain, reference the Manual Transmission and Manual Transmission sections from the vehicle’s service information. Access the Factory Manual from AutoRepairManuals.