Engine DAF XF280M

The DAF XF280M is a six-cylinder in-line, four-stroke, water-cooled diesel engine with an intercooled turbocharger and four valves per cylinder. The XF series employs an in-line injection pump, which sets it apart from its competitors. It should be mentioned that DAF developed the injection and intercooler based on the diesel engine from the previous generation.

The 380 horsepower engine uses 196 grams of fuel per kWh at 1200 rpm, demonstrating the high fuel efficiency of all DAF engines. Furthermore, when it comes to fuel quality, which is crucial for domestic operating conditions, DAF diesels are very modest. An excellent in-line mechanical high pressure fuel pump is part of the engine.

Specifications

Manufacturer	DAF
Also called	XF 280 M
Configuration	4 Stroke Water Cooled Diesel Engine
Number of cylinders	6
Piston stroke, mm	158
Cylinder bore, mm	130
Displacement, cc	12580
Power output, hp	381
Torque output, Nm / rpm	1750
Euro standards	Euro 2
Weight, kg	1050

1. Thermostat housing
2. Water pump
3. Air conditioning compressor
4. Fan drive
5. Vibration damper
6. Pneumatic compressor
7. Oil cooler
8. Turbocharger
9. Centrifugal filter
10. Oil filler neck
11. Steering pump
12. Fuel pump drive housing
13. Fuel pump
14. Oil filter
15. Engine brake valve
16. Starter
17. Engine data plate
18. Fuel filter
19. Cooling system filter
20. Coolant line
21. Intake manifold
22. Glow relay
23. Generator

The DAF XF280M engine has certain operational quirks. Specifically, since the engine is highly thermally loaded and coolant can seep through the head gasket, it is thought that you shouldn’t stop it right away after stopping the vehicle. This implies that it is preferable to let the engine idle for a short while, which will also extend the turbocharger’s operating time. Pay close attention to the engine’s weak points, such as the pump drive and leaking crankshaft oil seals.

These engines are also thought to have issues with the roller pushers of the rods. Therefore, after half a million runs, the roller axis punctures the pusher eyes, causing the roller to skew, jam, and ultimately saw the camshaft cam’s groove. The advance replacement of the pushers is the only viable solution.

Loss of engine power

Inadequate engine thrust can occur for a number of reasons. The primary ones and strategies for getting rid of them:

Possible Cause	Remedy
Inappropriate fuel priming pump performance	Check fuel pump pressure
Fuel priming pump banjo bolt strainer clogged	Check for clogged strainer
Water in the fuel system	Check water separator
Fuel filter silting	Replace the fuel filter with a new one
Incorrect or clogged fuel injectors installed	Check the correspondence of the installed injectors. Clean dirty nozzles and refit.
Incorrect injection timing or incorrect high pressure fuel pump settings	Check injection timing and / or fuel pump settings.
Compression too low in the engine cylinders	Check cylinder compression
Air in the fuel system	Bleed fuel system
High pressure fuel lines damaged	Check high pressure fuel lines (replace if necessary)
Clogged fuel tank breather	Check / clean breather
Clogged air filter	Clean or replace air filter element
Blocked air supply from turbocharger to intake manifold	Check air duct (clean if necessary)
Depressurization of the intake system in the boost area	Check engine intake for leaks
Discharge part of turbocharger dirty	Clean the discharge section with a mild cleaning agent or a soft brush. Check inlet side for carbon deposits or other contamination.
Blocked exhaust manifold, exhaust muffler, exhaust pipe. Malfunction of the exhaust system.	Check engine exhaust system. Clean if necessary
Exhaust gas leaks between exhaust manifold and cylinder head	Check mounting bolts and gaskets
Incorrect installation or damage to the wastegate	Check setting and status of wastegate
Damaged turbocharger	Replace turbocharger
Incorrect setting of valve clearances	Check valve clearances. Adjust if necessary
Incorrect DEB installation	Check DEB backlash. Adjust if necessary
DEB won’t shutdown	Check DEB function
Clogged air filter	Clean with compressed air or replace air filter element
Air leaks between intake manifold and cylinder head	Check tightness. If you need to replace the gasket with a new one
Malfunction of the cooling system	Check engine cooling system
Lubrication failure	Check engine lubrication system
Damaged valve springs	Check valve springs. Replace if necessary
Excessive piston-to-bore clearance	Check piston-to-cylinder clearance
Turning the crankshaft or crankshaft bearing pads	Check crankshaft bearing shells. Eliminate the problem
Fuel System Malfunction	Check fuel system
Intake system malfunction	Check intake system
Mounting the pneumatic compressor, fan drive, air conditioning compressor	Check that the pneumatic compressor, fan drive, air conditioning compressor or other attachments are securely attached to the engine
Inappropriate tension or displacement of the V-belt	Check the tension and correct installation of the V-belts
Excessive water pump radial play	Check water pump radial play
Damaged fan or fan touching the radiator	Check fan and heatsink
Damaged or weakened engine mounts	Check the condition of the engine mounts
Excessive valve clearance	Adjust valve clearance
Damage to the valve train and / or tappets, rocker arms or their axles	Check valve train for damage
Damage to vibration damper	Check vibration damper for damage
Damage to pistons and / or cylinder liners	Check condition of pistons and cylinder liners
Timing gears	Check the timing gears for play and / or damage
Loose or destroyed flywheel or connecting bolts	Check condition of flywheel / connecting bolts

Explanation of marking DAF XF280M

XF	Extra Forte, heavy truck series (18-36 tons)
280	Engine power, kW – 280
M	Upgraded