Description

Doosan D1146T, D1146TI, DE08TS, DE08TIS Technical Manual

You know how it goes – you pull a marine diesel out of a hull, and the owner hands you a photocopy of a photocopy of some aftermarket booklet with torque values that don’t match the head bolts you’re holding. That’s what kills billable hours. This Doosan D1146T, D1146TI, DE08TS, DE08TIS Technical Manual is a 17-page factory print from Doosan Infracore, not a reprint of a PDF that’s been scanned three times. I’ve seen too many guys guess on injection pump rack settings and end up with a runaway engine. This sheet is what you keep clipped to the toolbox when you’re setting valve lash or checking compression on an excavator or genset application.

Let’s get something straight: these four engine models share a 6-cylinder, 8,071 cc displacement block with different induction configurations – turbocharged on the D1146T and DE08TS, turbocharged and intercooled on the D1146TI and DE08TIS. The manual splits them out by suffix codes and gives you the specs that actually matter for a proper rebuild or overhaul. Page 2 has the full bore and stroke (111 × 139 mm), compression ratio differences (16.7:1 vs 19.5:1 depending on model), and the exact fuel injection order – 1-5-3-6-2-4, common to all four. If you’ve ever chased a misfire because you mixed up the firing order on a Doosan, you already know why that page alone is worth the access.

Engine Specifications from Page 2

The table on page 2 runs through every measurable parameter: cylinder liner type (replaceable dry liner), number of piston rings (2 compression, 1 oil), rotating direction (counterclockwise from flywheel), and valve clearances set at 0.3 mm cold for both intake and exhaust. That’s an odd spec compared to some other industrial diesels – a lot of guys default to 0.25 or 0.35, but this manual puts you right on 0.3. Also listed: intake valve opens at 16° BTDC, closes at 36° ABDC; exhaust opens at 46° BBDC, closes at 14° ATDC. You don’t get that from a Chilton’s. Need the charging specs? Alternator is 24V – 50A (option), starter motor 24V – 6.0 kW. Lube oil capacity runs 21 liters max, 17 min – but some versions go up to 31.5. Check the suffix code. This isn’t a manual you read once and shelve; it’s a paper you reach for every time an engine comes in for a top-end or injector work.

Does the Manual Include Injection Pump Data?

Yes, and it’s the part most aftermarket sources get wrong. The “Engine specifications & Injection pump datas” section isn’t just a one-line reference – it gives you the injection pump type (Bosch in-line), governor type (Mechanical RSV), nozzle type (multi-hole), and then tells you injection pressure must be referred to the rack data table. That means you need the factory table per engine suffix to set opening pressure correctly, and this manual includes those numbers for models like EADEA, EADLA, EAPEB, and others. It also lists fuel injection timing in degrees BTDC: most D1146T variants run 12° ± 1°, while some DE08TIS versions use 15° ± 1°. If you’re swapping pumps or recalibrating after a rebuild, you don’t guess – you pull out page 3 and match the suffix code.

17 Pages of Factory Data – What You Get

This isn’t a workshop manual with 500 pages of theory. It’s a 17-page technical bulletin that gives you the exact engine specifications, injection pump data, power/torque curves, and engine dimension drawings for all four models. You get the physical dimensions: the D1146T weighs 720 kg (with flywheel accessories), the DE08TIS comes in at 800 kg while being a few inches narrower. That matters when you’re building engine mounts or designing a cooling layout in a marine engine room. Also included are cooling system specs – water pump type (centrifugal, belt-driven), cooling capacity (11 liters engine only), and thermostat range (71 – 85°C or 71 – 90°C, wax pellet type). These specs affect how you fill and bleed the cooling circuit. Most aftermarket summaries skip the thermostat crack-off temperature entirely.

If you’re working on a Doosan excavator or generator set that uses one of these engines, this manual is the OEM reference you should have open on your tablet or printed and laminated. I’ve used it myself to verify compression pressure (28 kg/cm² at 200 rpm) and to confirm the lubrication method – full forced pressure feed with a gear-type oil pump driven off the crankshaft. The oil filter is a paper element cartridge type. Don’t use a spin-on adapter without confirming thread pitch with this sheet.

Check Valve Clearance Before Assembly

Intake and exhaust valve clearance: 0.3 mm cold. Both. On all four models. That’s not a typo. The manual shows the valve overlap diagram on the spec table – if you’re re-installing a cylinder head, set lash cold, then re-check after the first heat cycle. The manual doesn’t give you a hot lash spec, so don’t trust your feeler gauge after it’s been running for 15 minutes. Go back to cold adjustment. And while you’re at it, note the compression ratio difference: 16.7:1 for non-intercooled (D1146T / DE08TS) and 19.5:1 for intercooled (D1146TI / DE08TIS). That affects injection timing and glow plug requirements. Intercooled engines run higher peak pressures; if you swap a turbo-only head onto an intercooled block, you’ll have problems. The manual separates these clearly.

D1146T vs DE08TS: Key Differences in the Manual

Both are turbocharged, 4-cycle, water-cooled, direct-injection, six-cylinder engines with the same bore/stroke and displacement. So what’s different? The power and torque ratings. The D1146T with suffix EADEA makes 170 PS at 2,000 rpm with 66 kg·m torque at 1,400 rpm. The DE08TS with suffix EAPEB makes 205 PS at 1,900 rpm with 88 kg·m torque at 1,300 rpm. That’s a 35 PS jump – not because the block is different, but because the injection pump settings and intercooling package change. The manual gives you the injection timing per suffix: 12° BTDC for most D1146T, 15° BTDC for some DE08TIS variants. If you’re tuning or diagnosing low power, you check the suffix code and confirm the timing against these tables. Also note the engine weight: D1146T is 720 kg, DE08TS is 800 kg – the extra weight is the intercooler and piping. Don’t trust a generic spec book that doesn’t break out these suffixes.

For related Diesel engine documentation, check the Doosan B40X-5, B45X-5, B50X-5 2007 Technical Manual – Factory Specs and Doosan D50S-5, D60S-5, D70S-5, D80S-5, D90S-5 2008 Technical Manual or the Doosan D50S-5 D60S-5 D70S-5 D80S-5 D90S-5 2007 Technical Manual for other engine platforms. And if you need fundamentals on drivetrain components like a Manual Transmission, that’s a separate topic – this manual covers only the engine side. For additional context on industrial diesel timing, see Manual Transmission (again, not covered here, but useful for understanding gear-driven auxiliaries).

Source Validity: Original Infracore Print, Not a Scan

The file you get is a direct PDF of the Doosan Infracore technical publication PS-MMA0415-E1A, printed January 2007. It’s not an aftermarket compilation that combines random specs from different years. Every page is numbered, and the spec tables are laid out the way Doosan intended. I’ve seen shops buy so-called “factory manuals” from third-party sellers that have mismatched compression ratios – that costs you time and head gaskets. This one is the real sheet. 17 pages, clear tables, no guesswork. Access it, print it, and keep it in your engine bay binder.

Does this manual include torque specs for the cylinder head?

No. Torque values are not listed in this technical bulletin. It covers injection pump data and engine specifications, not fastener torques.

What models are covered in the injection pump data section?

All four models – D1146T, D1146TI, DE08TS, and DE08TIS – are covered with separate power/torque tables and injection timing values per suffix code. The manual breaks down by suffix (e.g., EADEA, EAPEB) so you can identify your exact engine build. If you’re unsure of your suffix, look at the engine dataplate – it’s stamped on the block near the injection pump. This manual shows you what performance parameters each suffix corresponds to, including high idle, low idle, power, and torque. That’s the kind of granular data you don’t get from a generic engine spec sheet. If your engine has a modified pump, cross-reference the rack data table on page 3. The injection pressure is not a fixed number – it’s listed as ‘Refer to injection pump rack data,’ which means you need the specific plunger and barrel set for your pump. This manual gives you the engine-side data to verify that your pump is within factory tolerances.

Get this thing on your workbench. Access the Factory Manual and you’ve got the official Doosan reference that belongs in every marine diesel shop that sees a D1146T or DE08TIS come through the door.