DEUTZ TCD 7.8 L6 Diesel Engine
Overview
The DEUTZ TCD 7.8 is the largest inline engine in the current DEUTZ industrial portfolio and bridges the gap between mid-size six-cylinder engines and the V-configuration TCD 12.0. It delivers 160 to 260 kW and 1400 Nm at 1450 rpm, which places it in the power class of large wheel loaders, mobile crushers, drilling rigs, big screw compressors and agricultural tractors. DEUTZ Corporation describes it as a modern development of the DEUTZ 2013 engine, with larger displacement and more power.
Seven Star LLC supplies the DEUTZ TCD 7.8 to equipment owners, OEMs and maintenance contractors in Oman and the GCC. Every quotation comes with the DEUTZ datasheet, and our engineering support in Muscat helps customers specify the right rating and aftertreatment arrangement for their machine.
Working Principle
The DEUTZ TCD 7.8 is a water-cooled six-cylinder inline diesel with turbocharging, charge air cooling and cooled external exhaust gas recirculation. A 110 mm bore and 136 mm stroke give it a long-stroke character that favours torque at low and medium speeds. Fuel is supplied by the DEUTZ Common Rail (DCR) injection system and managed by the EMR 4 controller, which DEUTZ says is linked intelligently to the drive management for optimum performance at low fuel consumption.
Exhaust gas is treated by modular DVERT components, with SCR and DPF arrangements available depending on the target emission stage. DEUTZ quotes a best-point specific fuel consumption of 192 g/kWh on its US product page, and notes that the aftertreatment regenerates without downtime. For a machine working a full shift, this means sustained output without stops for filter cleaning cycles.
Engineering Design of the DEUTZ TCD 7.8
According to the DEUTZ AG 2026 datasheet, the engine weighs 725 kg and measures 1214 mm long, 842 mm wide and 1062 mm high. Maximum nominal speed is 2300 rpm and minimum idle is 800 rpm. The DOC/DPF and SCR modules have their own documented dimensions, making it straightforward for a machine designer to plan the exhaust routing.
DEUTZ kept installation and connection dimensions consistent so earlier designs can move to newer emission stages with minimal redesign. The DEUTZ TCD 7.8 offers full power take-off at flywheel and front end, plus up to two auxiliary PTO drives with a combined torque of up to 395 Nm for hydraulic pumps and fan drives. Long oil change intervals support high machine availability.
DEUTZ also notes that the compact engine design and customer-friendly accessories reduce installation costs and widen the number of possible applications, an advantage for builders of specialised equipment produced in small series for regional markets.
Key Features
The DEUTZ TCD 7.8 brings these manufacturer-documented features to heavy equipment.
- Power output of 160 to 260 kW at 2300 rpm according to ISO 14396.
- Maximum torque of 1400 Nm at 1450 rpm from 7.755 litres displacement.
- Turbocharging with charge air cooling and cooled external EGR.
- DEUTZ Common Rail injection with EMR 4 electronic engine control.
- DVERT exhaust aftertreatment that regenerates without downtime.
- EU Stage V, US Tier 4 and CN IV compliance, and listed as HVO ready.
- Up to two additional PTO drives with a total of up to 395 Nm.
- Agricultural and emission-downgrade (Stage IIIA / US Tier 3) versions available.
Industrial Applications
In the Sultanate of Oman, the DEUTZ TCD 7.8 matches the duty of heavy mobile compressors for well-site nitrogen and air services, large dewatering and transfer pumps, mobile crushing plants in aggregate quarries, and earthmoving machines on infrastructure projects in Duqm and Salalah. Its torque reserve is useful when equipment must hold output during high ambient temperatures and dusty conditions. Engineers comparing it with other heavy-duty engines such as the Perkins 2506C-E15TAG2 diesel engine can review both datasheets side by side.
Seven Star LLC supplies the DEUTZ TCD 7.8 together with control hardware such as the Cummins PowerCommand display-control assembly for customers who maintain mixed engine fleets. For continuous power at a larger scale, we also support medium-speed solutions like the Wartsila 20 generating set engine, all from our Muscat base serving the GCC.
Fuel, Emissions and Service Planning
The 2026 datasheet lists the DEUTZ TCD 7.8 as HVO ready. Hydrotreated vegetable oil is a renewable paraffinic diesel that can be used without hardware changes, offering contractors a straightforward way to reduce lifecycle carbon emissions on heavy equipment fleets as clients introduce carbon reporting requirements in their tenders.
Because the engine replaces the DEUTZ 2013 series while keeping consistent installation and connection dimensions, owners of older machines can plan repowering projects with less fabrication work. DEUTZ also offers agricultural and emission-downgrade versions to Stage IIIA / US Tier 3 without exhaust aftertreatment, which can simplify installation where local regulations permit. For specific aftertreatment ratings, DEUTZ recommends consulting its application engineering. Seven Star LLC can raise this as part of a quotation, and we advise checking radiator and air filter sizing with the machine builder when a DEUTZ TCD 7.8 will operate in desert dust and summer heat.
Technical Specifications
Data for the DEUTZ TCD 7.8 below is taken from the DEUTZ AG 2026 product datasheet.
| Parameter | Specification |
|---|---|
| Model | DEUTZ TCD 7.8 L6 |
| Cylinders | 6 in-line |
| Displacement | 7.755 l |
| Max. nominal speed | 2300 min-1 |
| Aspiration | Turbocharger with charge air cooler |
| Power output (ISO 14396) | 160–260 kW at 2300 min-1 |
| Max. torque | 1400 Nm at 1450 min-1 |
| Min. idle speed | 800 min-1 |
| Weight (DIN 70020 Part 7A) | 725 kg |
| Dimensions A / B / C | 1214 / 842 / 1062 mm |
| Aftertreatment | DOC/DPF and SCR (Stage V standard) |
| Emission compliance | EU Stage V, US Tier 4, CN IV ready, HVO ready |
How to Order
Contact Seven Star LLC for a formal quotation on the DEUTZ TCD 7.8, including your application, required rating and emission stage. Our Muscat team will confirm the configuration against the DEUTZ datasheet available here and provide stock and delivery information for Oman and the GCC.
- Datasheet DEUTZ TCD 7.8 L6 Product Datasheet (DEUTZ AG, 2026 edition) Download
DEUTZ engine families listed here
DEUTZ engine names can be read directly. In TCD 6.1 L6, TCD stands for a turbocharged diesel with charge air cooling, 6.1 is the displacement in liters and L6 means six cylinders in line. A V marks a vee engine, as in TCD 12.0 V6 and TCD 16.0 V8. The engines listed are:- Compact engines: TCD 2.2 L3, TCD 2.9 L4, TCD 3.6 L4
- Mid-range engines: TCD 4.1 L4, TCD 6.1 L6, TCD 7.8 L6
- Large engines: TCD 12.0 V6, TCD 16.0 V8, TCD 18.0 L6
- G 2.9 L4 for LPG and gasoline
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