The DAF MX 375 is an intercooled, 12.9-liter, in-line, 6-cylinder, 24-valve turbocharged engine. A single-stage turbine with a controlled check valve powers the MX 375. This engine’s high torque of up to 2500 Nm at low revs of up to 1410 rpm enables the motor to operate at its peak efficiency.
The piston stroke and cylinder diameter measure 130 by 162 mm. Each cylinder has four valves. The exhaust valves have double springs, while the intake valves have single springs. top stop and wet cylinder liners. The pistons are oil-cooled and feature three rings.
The engine is built to meet the Euro 5 standard’s emission requirements, and the environmental standard is raised to EEV with the installation of a particulate filter.
Specifications
| Manufacturer | DAF |
| Also called | MX 375 |
| Configuration | inline turbocharged diesel |
| Number of cylinders | 6 |
| Firing order | 1-5-3-6-2-4 |
| Piston stroke, mm | 162 |
| Cylinder bore, mm | 130 |
| Displacement, cc | 12900 |
| Power output, hp | 510 |
| Compression ratio | 16,5:1 |
| Torque output, Nm / rpm | 2000 |
| Euro standards | Euro 5 |
| Weight (dry) | 1200 kg |
The new generation of injectors on the MX 375 engine have a SMART injection system (different needle opening pressure). Depending on the DAF truck’s driving mode, atomization and injection are electronically controlled to supply the ideal quantity of fuel to the cylinders. 2000 bar is the maximum injection pressure.
The design solutions listed below are noteworthy. Water and oil supply lines, high pressure pump housing, and low pressure fuel lines are all integrated into the cylinder block. Due to the lack of side covers, the DAF MX 375 power unit is more rigid and produces less noise overall. The oil thermostat and cooler are integrated into a single device.
Basic design solutions in the engine
Cylinder block:
- Compact Graphite Iron (CGI);
- integrated high-pressure fuel pump housing;
- high-strength, wear-resistant liners;
- enhanced cooling.
Cylinder head:
- one-piece with integrated compact graphite iron (CGI) intake manifold;
- aluminum valve cover
Valves:
- Each cylinder has four valves;
- double spring exhaust valves;
- and single spring inlet valves.
Cylinder liners:
- wet cylinder liners with anti-polishing ring.
Pistons:
- oil cooled pistons;
- three piston rings per piston.
Crankshaft:
- stamped steel crankshaft without counterweights.
Sump:
- sump made of composite materials for weight saving;
- special shirring for noise reduction;
- electronically controlled crankcase ventilation
Distribution mechanism:
- installed from the back;
- spur gear distribution drive
Cleaning the DAF MX 375 engine
The pressurized water jet can scuff up the spider seals and wash out the grease when cleaning the steering gear’s universal joint. Consequently, the steering gear may jam and the cross may become stuck.
The steering fluid reservoir has the bleed port installed. Through this fitting, pressurized water may enter the reservoir and harm the steering gear.
When cleaning the radiator and intercooler, make sure that no pipes or fins are damaged.
Avoid aiming a long-term, high-pressure water jet at the air conditioning system’s condenser. Elevated temperatures have the potential to result in excessive system pressure, which could harm the system.
Verify that the breathers do not allow any water to enter the transmission.
Ensure that the expansion tank’s bleed nipple does not allow water to enter the clutch hydraulic.
Avoid aiming the water jet at electrical components when using a high pressure unit to clean the engine compartment.
Avoid aiming the water jet straight at car lighting pads, electrical connectors, etc.
Ensure that neither air intakes nor flexible seals allow water to enter the engine intake system.
Explanation of markings DAF MX 375
| MX | 12.9 liter engine family |
| 375 | Engine power, kW – 375 |
This series’ engines are known for their extraordinary durability. Subject to ongoing scheduled maintenance, the company guarantees 1.6 million kilometers of mileage.