Mercedes OM404 Diesel Engine Manuals
The Mercedes-Benz OM404 is a 12-cylinder V12 diesel engine with volumes of 19,140 or 20,910 cc and include turbocharged and aftercooler versions. Produced from 1975-1980
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Download: Mercedes OM404 Engine Service Repair Manual
- Variants: OM404 Diesel, OM404A Turbo Diesel
- OM404LA Aftercooled and Turbocharged Diesel
- Multi Unit Manual: OM401,
OM402, OM403,
OM404*
- * Use as Reference for OM404 V12 (same procedures)
- Download: 26.2mb, 216 pages, .pdf
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*(same procedures) while this manual does not specifically have OM404 specs, it is from the same series as the 401 V6, 402 V8 and 403 V10 but with 12-cylinders, ie. 404 V12
OM404 Technical Data
The Mercedes-Benz OM 404 A, LA is a V12 12-cylinder with a piston
stroke of 142 mm. The 12-cylinder engine was also offered as a turbocharged
option.
The 12-cylinder engine was not used in regular Mercedes or MAN trucks,
but only in special vehicles (e.g. heavy-duty tractors). Due to its
greater length, it was the only one that did not fit completely under
the driver's cab, but instead stuck out at the back. With modified peripheral
equipment, all engines were also offered as built-in engines, ship drives,
locomotive drives, or as small power plants and similar purposes.
These 400 series motors were developed jointly by Daimler-Benz and MAN beginning in the 1960s and built jointly for more than 20 years, while maintaining company specifics such as different combustion processes. The aim was to use the cooperation of both manufacturers to share expensive basic elements (such as engine blocks, in-line injection pump, crankshafts and flywheels). The engines were practically identical in construction down to below the cylinder head gasket, pistons and (individual) cylinder heads were manufacturer-specific with direct injection for Mercedes. The main area of application was heavy trucks.
The engine series OM 401 V6, OM 402 V8, OM 403 V10 and OM 404 V12 complete the 400 series of diesel engines with 6 to 12 cylinders in V-arrangement.
Version Specifications and Model Codes
| Variant | CCM | kW | HP@RPM | Bore/Stroke | Comp. | Torque @ RPM |
|---|---|---|---|---|---|---|
| OM 404.900 | 19,140 | 430 hp @ 2500 rpm | 125/130 | 1380 Nm @ 1600 rpm | ||
| OM 404.901 | 20.910 | 125/142 | ||||
| OM 404.910 | 20,910 | 294 | 394 hp @ 2300 rpm | 125/142 | ||
| OM 404.918 | 20.910 | 125/142 | ||||
| OM 404 | 20.910 | 282 | 378 hp @ 2500 rpm | 125/130 | 17.2:1 | 1236 Nm @ 1300 rpm |
| OM 404 A | 20.910 | 503 hp @ 2300 rpm | 125/142 | |||
| OM 404 LA | 20.910 | 330 | 550 hp @ 2300 rpm | 125/142 | 16.75:1 | 1690 Nm @ 1300 rpm |
OM404 - 19.12 liter, 1168 CID
Bore 125 mm, 4.92 in
Stroke 130 mm, 5.12 in
Natural Aspiration 17.2:1
OM404 - V12 Natural Aspiration
OM404A - V12 Turbocharged
OM404LA - V12 Turbo Aftercooled
Weight (approx) OM404 - 2458 lb, OM404LA - 2645 lb.
OM404 - 378 hp, 282 kW @ 2500 rpm - 912 lb.ft, 1236 Nm @ 1300 rpm
OM404LA - 443 hp, 330 kW @ 2500 rpm - 1247 lb.ft, 1690 Nm @ 1300 rpm
Daimler-Benz OM404, OM404A, OM404LA
