DAF LF45, LF55 Service manual

4

STRUCTURE

ΛΦ45/55 series

TECHNICAL DATA

DIAGNOSTICS

BE ENGINE FUEL SYSTEM

BE ENGINE INLET/EXHAUST SYSTEM

ENGINE BRAKE, BE ENGINE

CE ENGINE FUEL SYSTEM

CE ENGINE INLET/EXHAUST SYSTEM

ENGINE BRAKE, CE ENGINE

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4	TECHNICAL DATA
ΛΦ45/55 series	Contents

CONTENTS

Page Date 0

1. ENGINE, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 . . . . . 200416 1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 . . . . . 200416 1.2 BE engine, general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 . . . . . 200416 1.3 CE engine, general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 . . . . . 200416

2. BE ENGINE FUEL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 . . . . . 200416 2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 . . . . . 200416 2.2 Tightening torques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 . . . . . 200416

3. CE ENGINE FUEL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . 200416 3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . 200416 3.2 Tightening torques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 . . . . . 200416

4. BE ENGINE INLET/EXHAUST SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . 200416 4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . 200416 4.2 Tightening torques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 . . . . . 200416

5. CE ENGINE INLET/EXHAUST SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 . . . . . 200416 5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 . . . . . 200416 5.2 Tightening torques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 . . . . . 200416

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TECHNICAL DATA	4
Contents	ΛΦ45/55 series

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4	TECHNICAL DATA
ΛΦ45/55 series	Engine, general
1. ENGINE, GENERAL
			0
1.1 GENERAL
BE/CE engine
Cold engine	A cold engine is an engine which, having reached
	operating temperature, has been allowed to cool
	down for at least six hours.
Warm engine	A warm engine is an engine which, having reached
	operating temperature, has not been at a standstill
	for more than thirty minutes.

Direction of rotation of the engine

First cylinder of the engine

Left-hand and right-hand side of the engine

Engine identification Engine number

The engine number is located in two places on the engine:

The direction of rotation of the engine is clockwise, as seen from the vibration damper end.

The first cylinder of the engine is the cylinder at the vibration damper end of the engine.

The left-hand side of the engine is the side where the air compressor and electronic unit are mounted. The right-hand side of the engine is the side where the turbocharger and oil filter are mounted.

-stamped into the engine block, top of the oil cooler

-on the type plate, fitted on the timing gear case or on the flywheel housing (depending on the production date)

Engine type

The type number CE162C indicates:
C engine family	B =	3.92 ltr.
	C =	5.88 ltr.
E engine version	E =	electronic timing
162 engine output in kilowatt (kW)
C Euro emissions	C =	Euro 3

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		TECHNICAL DATA				4
		Engine, general				ΛΦ45/55 series
		1.2 BE ENGINE, GENERAL
0
		Engine types
		Coding		BE 99 C
				BE 110 C
				BE 123 C
		General specifications
		Environmental standard		Euro 3 (C)
		Number of cylinders		4 cylinders in line
		Valves		4 valves per cylinder
		Bore x stroke		102 x 120 mm
		Cubic capacity		3.9 litres
		Compression ratio
		BE 99 C		17.0 : 1
		BE 110 C		17.0 : 1
		BE 123 C		17.3 : 1
		Fuel injection		direct injection
		Injection sequence		1-3-4-2
		Air inlet system		Turbocharger intercooling
		Engine management system		ECS-DC3
		Cooling		fluid
		Weight		approx. 400 kg
		Engine speeds, BE engine
		Engine type		Idling		Maximum no-load rpm
				rpm
		BE 99 C		600 - 800		Approx. 2500
		BE 110 C		600 - 800		Approx. 2500
		BE 123 C		600 - 800		Approx. 2500

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4				TECHNICAL DATA
ΛΦ45/55 series				Engine, general
1.3 CE ENGINE, GENERAL
						0
Engine types
Coding		CE 136 C
		CE 162 C
		CE 184 C
General specifications
Environmental standard		Euro 3 (C)
Number of cylinders		6 cylinders in line
Valves		4 valves per cylinder
Bore x stroke		102 x 120 mm
Cubic capacity		5.9 litres
Compression ratio		17,3 : 1
Fuel injection		direct injection
Injection sequence		1-5-3-6-2-4
Air inlet system		Turbocharger intercooling
Engine management system		ECS-DC3
Cooling		fluid
Weight		approx. 500 kg
Engine speeds, CE engine
Engine type		Idling		Maximum no-load rpm
		rpm
CE 136 C		600 - 800		approx. 2500
CE 162 C		600 - 800		approx. 2500
CE 184 C		600 - 800		approx. 2500

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TECHNICAL DATA	4
Engine, general	ΛΦ45/55 series

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4		TECHNICAL DATA
ΛΦ45/55 series		BE Engine fuel system
2. BE ENGINE FUEL SYSTEM
								0
2.1 GENERAL
Fuel level element		70
Angular displacement
Fuel fine filter
Maximum pressure drop across fuel fine filter		2.0 bar
Lift pump
Fuel lift pump pressure in front of fine filter (with
engine at idling speed)		5 - 13 bar
Fuel lift pump pressure behind fine filter (with en-
gine at idling speed)		3 - 11 bar
Pressure relief valve opening pressure		11 bar
Maximum underpressure on suction side of fuel
lift pump		0.5 bar
High-pressure pump
Pump pressure (dependent on the operating
mode of the engine and the electronic calibration)		300 - 1400 bar
Fuel rail
Fuel rail pressure (dependent on the operating
mode of the engine and the electronic calibration)		300 - 1400 bar
Fuel rail pressure-limiting valve
Opening pressure		1650 bar
Injector
Number of holes in injector		8
Resistance of magnet coil		0,15 - 0,5
Injector washer
Nozzle length (dis-	Washer thickness
tance A)
21.5 ≥ 0.2 mm	1.5 mm
23.0 ≥ 0.2 mm	3.0 mm
				A
				i400693

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		TECHNICAL DATA	4
		BE Engine fuel system	ΛΦ45/55 series
		Fuel return overflow valve
0
		Fuel return overflow valve opening pressure	1.2 - 2.0 bar
		Fuel return pipe
		Maximum return pipe pressure build-up	0.2 bar
		Return fuel measurement
		Maximum quantity of return fuel at idling speed	120 ml/min.
		Minimum permitted time for filling a measuring
		beaker to a volume of 360 ml	3 min.

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4	TECHNICAL DATA
ΛΦ45/55 series	BE Engine fuel system
2.2 TIGHTENING TORQUES
			0
The tightening torques specified in this section
are different from the standard tightening torques
cited in the overview of the standard tightening
torques. The other threaded connections not
specified must therefore be tightened to the
torque cited in the overview of standard
tightening torques.
When attachment bolts and nuts are replaced, it
is important that - unless stated otherwise - these
bolts and nuts are of exactly the same length and
property class as those removed.
Electronic unit cooling plate
Attachment bolts holding the electronic unit to the
cooling plate	10 Nm
Attachment bolts holding the cooling plate to the
engine block	24 Nm
VOSS quick-release coupling fittings	18 Nm
Low-pressure fuel pipes
Banjo bolts	24 Nm
VOSS quick-release coupling fittings	24 Nm
Fuel return overflow valve in cylinder head	24 Nm
High-pressure pump
Attachment nuts holding the high-pressure pump
to the timing gear case	25 Nm
High-pressure fuel pipe
High-pressure pipe union nut	22 Nm
Fuel rail
Attachment bolts	24 Nm
Pressure-limiting valve	100 Nm
Injector pipes
Injector pipe union nuts	22 Nm
Fuel supply pipe
Fuel supply pipe nut	50 Nm
Injectors
Injector clamping bracket attachment bolts	10 Nm
Injector electrical connection	1.5 Nm

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TECHNICAL DATA	4
BE Engine fuel system	ΛΦ45/55 series

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4		TECHNICAL DATA
ΛΦ45/55 series		CE Engine fuel system
3. CE ENGINE FUEL SYSTEM
								0
3.1 GENERAL
Fuel level element		70
Angular displacement
Fuel fine filter
Maximum pressure drop across fuel fine filter		2.0 bar
Lift pump
Fuel lift pump pressure in front of fine filter (with
engine at idling speed)		5 - 13 bar
Fuel lift pump pressure behind fine filter (with en-
gine at idling speed)		3 - 11 bar
Pressure relief valve opening pressure		11 bar
Maximum underpressure on suction side of fuel
lift pump		0.5 bar
High-pressure pump
Pump pressure (dependent on the operating
mode of the engine and the electronic calibration)		300 - 1400 bar
Fuel rail
Fuel rail pressure (dependent on the operating
mode of the engine and the electronic calibration)		300 - 1400 bar
Fuel rail pressure-limiting valve
Opening pressure		1650 bar
Injector
Number of holes in injector		8
Resistance of magnet coil		0,15 - 0,5
Injector washer
Nozzle length	Washer thickness
(distance A)
21.5 ≥ 0.2 mm	1.5 mm
23.0 ≥ 0.2 mm	3.0 mm
				A
				i400693

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		TECHNICAL DATA	4
		CE Engine fuel system	ΛΦ45/55 series
		Fuel return overflow valve
0
		Fuel return overflow valve opening pressure	1.2 - 2.0 bar
		Fuel return pipe
		Maximum return pipe pressure build-up	0.2 bar
		Return fuel measurement
		Maximum quantity of return fuel at idling speed	180 ml/min.
		Time for filling a measuring beaker to a volume of
		360 ml	> 2 min.

3-2

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4	TECHNICAL DATA
ΛΦ45/55 series	CE Engine fuel system
3.2 TIGHTENING TORQUES
			0
The tightening torques specified in this section
are different from the standard tightening torques
cited in the overview of the standard tightening
torques. The other threaded connections not
specified must therefore be tightened to the
torque cited in the overview of standard
tightening torques.
When attachment bolts and nuts are replaced, it
is important that - unless stated otherwise - these
bolts and nuts are of exactly the same length and
property class as those removed.
Electronic unit cooling plate
Attachment bolts holding the electronic unit to the
cooling plate	10 Nm
Attachment bolts holding the cooling plate to the
engine block	24 Nm
VOSS quick-release coupling fittings	18 Nm
Low-pressure fuel pipes
Banjo bolts	24 Nm
VOSS quick-release coupling fittings	24 Nm
Fuel return overflow valve in cylinder head	24 Nm
High-pressure pump
Attachment nuts holding the high-pressure pump
to the timing gear case	25 Nm
High-pressure fuel pipe
High-pressure pipe union nut	22 Nm
Fuel rail
Attachment bolts	24 Nm
Pressure-limiting valve	100 Nm
Injector pipes
Injector pipe union nuts	22 Nm
Fuel supply pipe
Fuel supply pipe nut	50 Nm
Injectors
Injector clamping bracket attachment bolts	10 Nm
Injector electrical connection	1.5 Nm

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TECHNICAL DATA	4
CE Engine fuel system	ΛΦ45/55 series

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4	TECHNICAL DATA
ΛΦ45/55 series	BE Engine inlet/exhaust system

4. BE ENGINE INLET/EXHAUST SYSTEM

4.1 GENERAL

Turbocharger
BE 99 C	Holset HX 27 W
BE 110 C	Holset HX 27 W
BE 123 C	Holset HX 27 W
Minimum actuating pressure of wastegate cap-
sule under which the control rod will move	2.0 bar
Axial bearing play of compressor shaft	0.057 - 0.103 mm
Radial bearing play of compressor shaft	0.39 - 0.67 mm

Rejection standards for cracking

1.Cracks in the connector flange must not reach as far as the attachment holes.

2.Cracks in the connector flange must not

reach from the channels as far as the exterior.

3.Cracks in the connector flange may not be

longer than 15 mm.

4.Cracks in the connector flange must not be less than 6 mm apart.

5. There must be no cracks in the housing.	5

Exhaust gas back pressure
At full-load engine speed	100 mbar
Maximum back pressure during engine brake ap-
plication	4.3 bar
Inlet underpressure
At full-load engine speed (clean air filter)	25 mbar
At full-load engine speed (clogged air filter)	62 mbar
Glow element	180 - 220 m
Resistance value

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i400784

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		TECHNICAL DATA	4
		BE Engine inlet/exhaust system	ΛΦ45/55 series
		4.2 TIGHTENING TORQUES
0
		The tightening torques specified in this section
		are different from the standard tightening torques
		cited in the overview of the standard tightening
		torques. The other threaded connections not
		specified must therefore be tightened to the
		torque cited in the overview of standard
		tightening torques.
		When attachment bolts and nuts are replaced, it
		is important that - unless stated otherwise - these
		bolts and nuts are of exactly the same length and
		property class as those removed.
		Turbocharger
		Attachment nuts, exhaust manifold flange/turbo-	43 Nm (1)
		charger
		Oil discharge pipe attachment bolts	23 Nm
		Oil supply pipe union	28 Nm
		Turbocharger V-clamp	10 Nm
		(1) Fasten with Copaslip
		Intake manifold
		Glow element attachment bolts	14 Nm
		Air cooler
		Hose clamps	7 Nm

4-2

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4	TECHNICAL DATA
ΛΦ45/55 series	CE Engine inlet/exhaust system

5. CE ENGINE INLET/EXHAUST SYSTEM

5.1 GENERAL

Turbocharger
CE 136 C	Holset HY 35 W
CE 162 C	Holset HY 35 W
CE 184 C	Holset HX 35 W
Minimum actuating pressure of wastegate cap-
sule under which the control rod will move	2.0 bar
Axial bearing play of compressor shaft	0.038 - 0.093 mm
Radial bearing play of compressor shaft	0.329 - 0.501 mm

Rejection standards for cracking

1.Cracks in the connector flange must not reach as far as the attachment holes.

2.Cracks in the connector flange must not

reach from the channels as far as the exterior.

3.Cracks in the connector flange may not be

longer than 15 mm.

4.Cracks in the connector flange must not be

less than 6 mm apart.
5. There must be no cracks in the housing.	5

Exhaust gas back pressure
At full-load engine speed	100 mbar
Maximum back pressure during engine brake ap-
plication	4.3 bar
Inlet underpressure
At full-load engine speed (clean air filter)	25 mbar
At full-load engine speed (clogged air filter)	62 mbar
Glow element	180 - 220 m
Resistance value

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i400784

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		TECHNICAL DATA	4
		CE Engine inlet/exhaust system	ΛΦ45/55 series
		5.2 TIGHTENING TORQUES
0
		The tightening torques specified in this section
		are different from the standard tightening torques
		cited in the overview of the standard tightening
		torques. The other threaded connections not
		specified must therefore be tightened to the
		torque cited in the overview of standard
		tightening torques.
		When attachment bolts and nuts are replaced, it
		is important that - unless stated otherwise - these
		bolts and nuts are of exactly the same length and
		property class as those removed.
		Turbocharger
		Attachment nuts, exhaust manifold flange/turbo-	43 Nm (1)
		charger
		Oil discharge pipe attachment bolts	23 Nm
		Oil supply pipe union	28 Nm
		Turbocharger V-clamp	10 Nm
		(1) Fasten with Copaslip
		Glow element
		Attachment bolts	14 Nm
		Air cooler
		Hose clamps	7 Nm

5-2

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	4			DIAGNOSTICS
	ΛΦ45/55 series				Contents
	CONTENTS
				Page	Date
	1.	TRACTIVE PROBLEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . 1-1 . . .	. . 200416
							1
		1.1	Tractive problems	1-1	200416
	2.	FUEL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 2-1 . . . .	. 200416
		2.1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 2-1 . . . .	. 200416
		2.2	Fault-finding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 2-2 . . . .	. 200416
	3.	INLET/EXHAUST SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3-1 . . . .	. 200416
		3.1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3-1 . . . .	. 200416
		3.2	Fault-finding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3-2 . . . .	. 200416
	4.	ENGINE BRAKE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 4-1 . . . .	. 200416
		4.1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4-1 . . . .	. 200416
		4.2	Fault-finding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4-2 . . . .	. 200416

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DIAGNOSTICS	4
Contents	ΛΦ45/55 series

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4	DIAGNOSTICS
ΛΦ45/55 series	Tractive problems
1. TRACTIVE PROBLEMS
1.1 TRACTIVE PROBLEMS
The first test that has to be carried out when			1
investigating tractive problems is the acceleration
test.

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DIAGNOSTICS	4
Tractive problems	ΛΦ45/55 series

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4	DIAGNOSTICS
ΛΦ45/55 series	Fuel system
2. FUEL SYSTEM
2.1 INTRODUCTION
If there is a fault in the system, it is usually			1
detected by the electronic unit in the form of a
fault code. This fault code can be read out using
DAVIE. The fault-finding table contains possible
causes of symptoms not detected by the
electronic unit.

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		DIAGNOSTICS		4
		Fuel system		ΛΦ45/55 series
		2.2 FAULT-FINDING TABLE
		SYMPTOM: ENGINE CAN BE STARTED, BUT DOES NOT RUN
1
		Possible cause		Remedy
		Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
			and fill fuel tank with fuel
		Air in fuel system	Check for drawing in of air:
			- via the suction pipe
		Fuel fine filter/coarse filter clogged	Replace fuel fine filter and clean the system
		No fuel supply/high-pressure pump or fuel lift pump	Check:
		defective; no delivery	-	the fuel level
			-	the rail pressure
			- the pipes for blockage and leaks
			- the fuel lift pump
			- the high-pressure pump
		SYMPTOM: ENGINE STALLS AND RUNS AGAIN AFTER RE-STARTING
		Possible cause		Remedy
		Air in fuel system	Check for drawing in of air:
			- via the suction pipe
		SYMPTOM: ENGINE STARTS POORLY
		Possible cause		Remedy
		Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
			and fill fuel tank with fuel
		Air in fuel system	Check for drawing in of air:
			- via the suction pipe
		Fuel fine filter/coarse filter clogged	Replace fuel fine filter and clean the system
		Injector(s) mechanically defective or clogged	Replace the injectors
		High-pressure pump or fuel lift pump delivery too	Check:
		low	-	the high-pressure pump
			- the fuel lift pump
		Internal fuel leak between fuel supply pipe(s) and	Check the quantity of return fuel
		injector(s)
		SYMPTOM: ENGINE RUNS AT (INCREASED) IDLING SPEED AND DOES NOT RESPOND TO AC-
		CELERATOR PEDAL
		Possible cause		Remedy
		Mechanical defect of accelerator pedal sensor	Check:
			- mechanical connection of sensor/accelerator
				pedal
			-	accelerator pedal sensor

2-2

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	4	DIAGNOSTICS
	ΛΦ45/55 series	Fuel system
	SYMPTOM: DIESEL KNOCK DURING ACCELERATION
	Possible cause	Remedy
	Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
				1
		and fill fuel tank with fuel
	Air in fuel system	Check for drawing in of air:
		- via the suction pipe
	Injector defective	Check the injectors
	SYMPTOM: IRREGULAR RUNNING OF ENGINE
	Possible cause	Remedy
	Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
		and fill fuel tank with fuel
	Air in fuel system	Check for drawing in of air:
		- via the suction pipe
	Fuel fine filter/coarse filter clogged	Replace fuel fine filter and clean the system
	Injector(s) mechanically defective or clogged	Replace the injectors
	Injector defective	Check the injectors
	High-pressure pump or fuel lift pump delivery too	Check:
	low	- the high-pressure pump
		- the fuel lift pump

SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS

Possible cause		Remedy
Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
	and fill fuel tank with fuel
Fuel fine filter/coarse filter clogged	Replace fuel fine filter and clean the system
Injector(s) mechanically defective or clogged	Replace the injectors
Mechanical defect of accelerator pedal sensor	Check:
	-	mechanical connection of sensor/accelerator
		pedal
	-	accelerator pedal sensor
High-pressure pump or fuel lift pump delivery too	Check:
low	-	the high-pressure pump
	-	the fuel lift pump

SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED

Possible cause	Remedy
Fuel fine filter/coarse filter partially clogged	Replace fuel fine filter and clean the system
Injector(s) mechanically defective or clogged	Replace the injectors
Air leak in inlet system	Pressure-test the inlet system

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https://www.truck-manuals.net/

		DIAGNOSTICS	4
		Fuel system	ΛΦ45/55 series
		SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED
		Possible cause	Remedy
		High-pressure pump or fuel lift pump delivery too	Check:
1
		low	- the high-pressure pump
			- the fuel lift pump
		Fault in electrical components/wiring of:	Check the electrical system

-connectors

SYMPTOM: ENGINE SLUGGISH WHEN ACCELERATING OR UNDER HIGH LOAD

Possible cause		Remedy
Internal fuel leak between fuel supply pipe(s) and	Check the quantity of return fuel
injector(s)
High-pressure pump or fuel lift pump delivery too	Check:
low	-	the high-pressure pump
	- the fuel lift pump
SYMPTOM: WHITE/BLUE SMOKE IS EMITTED
Possible cause		Remedy
Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
	and fill fuel tank with fuel
Air in fuel system	Check for drawing in of air:
	- via the suction pipe
Fuel fine filter/coarse filter clogged	Replace fuel fine filter and clean the system
Injector(s) mechanically defective or clogged	Replace the injectors
High-pressure pump or fuel lift pump delivery too	Check:
low	-	the high-pressure pump
	- the fuel lift pump
Fault in electrical components/wiring of:	Check the electrical system
- connectors

SYMPTOM: BLACK SMOKE IS EMITTED

Possible cause	Remedy
Injector(s) mechanically defective or clogged	Replace the injectors
SYMPTOM: ENGINE OVERHEATED
Possible cause	Remedy
Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
	and fill fuel tank with fuel

2-4

© 200416

https://www.truck-manuals.net/

	4	DIAGNOSTICS
	ΛΦ45/55 series	Fuel system
	SYMPTOM: FUEL CONSUMPTION TOO HIGH
	Possible cause	Remedy
	Poor fuel quality	Drain fuel, flush fuel system, replace the fuel filters
				1
		and fill fuel tank with fuel
	Fuel fine filter/coarse filter clogged	Replace fuel fine filter and clean the system
	Injector(s) mechanically defective or clogged	Replace the injectors
	Leak in fuel system	Check for leaks
	SYMPTOM: REDUCED MAXIMUM ENGINE SPEED
	Possible cause	Remedy
	Air in fuel system	Check for drawing in of air:
		- via the suction pipe
	Fuel fine filter/coarse filter clogged	Replace the fuel filter and clean the system
	Injector(s) mechanically defective or clogged	Replace the injectors
	High-pressure pump or fuel lift pump delivery too	Check:
	low	- the high-pressure pump
		- the fuel lift pump

© 200416

2-5

https://www.truck-manuals.net/

DIAGNOSTICS	4
Fuel system	ΛΦ45/55 series

1

2-6

© 200416

https://www.truck-manuals.net/