DAF PACCAR MX-11 Engine Workshop Manual

• DAF CF Euro 6 (CF 310, CF 300, etc.)
• DAF XF 105 / 106 (lower trim levels)
• DAF LF

Manufacturer: PACCAR

Model: MX-11 300

Type: Inline 6-cylinder turbodiesel

Displacement: 10.8 liters

Power: 300 hp (220 kW) at ~1,450–1,700 rpm

Torque: approximately 1,400 Nm at 900–1,450 rpm

Fuel system: Common Rail

Variable geometry turbocharging (VGT)

Euro 6 emission standard (EAS + SCR + EGR + DPF)

Cooling: Liquid

Engine weight (dry): approximately 930 kg

1. 💨 EGR system and exhaust gas recirculation valve

Over time, it becomes clogged with soot and carbon deposits, especially during city driving or idling.

Signs: rough operation, loss of power, exhaust temperature errors, increased fuel consumption.

Solution: clean or replace the EGR valve, perform regular DPF regeneration.

2. 🧯 Diesel Particulate Filter (DPF)

A clogged filter is a common cause of the engine going into limp mode.

Signs: increased fuel consumption, limited power, DPF pressure error.

Solution: Forced regeneration, chemical cleaning, replacement if severely worn.

Tip: Don't interrupt regeneration while it's in progress (usually increased idle speed and louder fan).

3. ⚡ Sensors and Electronics

The fuel pressure sensor, NOx sensor, and DPF differential pressure sensor are the most common culprits.

When dirty or aging, they produce false alarms, leading to a loss of power.

Solution: Diagnosis with a Davie X scanner or similar, sensor replacement.

4. 💧 Oil and coolant leaks

Possible around the valve cover, heat exchanger, or EGR cooler connections.

Oil leaks are common in the turbocharger hose or crankshaft seal.

Make sure the engine is clean and the fluid levels are correct.

5. 🌀 Variable Geometry Turbocharger (VGT)

If carbon deposits form on the blades, the geometry seizes, causing the turbine to run unevenly.

Symptoms: unstable power, boost error, black smoke.

Solution: Preventative cleaning of the geometry drive, use of high-quality oil and fuel.

6. 🔋 SCR (AdBlue) System

Possible dosing unit failure, AdBlue crystallization in the lines.

Signs: NOx error, loss of power, increased fuel consumption.

Solution: Flushing the system, checking the dosing unit and sensors for heating.

7. ⚙️ Camshafts and Valve Train

At high mileage (>800,000 km), camshaft lobes may wear out.

This is especially true if oil changes are not carried out on time.

Symptoms: clattering noise, loss of compression, unstable operation.