Deutz BF4L1011FT Specifications
| Engine Model: Deutz BF4L1011FT |
| Engine Type: 4-stroke 4-cylinder turbocharged air-cooled diesel |
| Total Displacement: 167 cu.in (2.73 L) |
| Rated Engine Power: 62-70 Hp (46-52 kW) at 2500 rpm |
| Fuel System Type: Direct injection |
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The Deutz BF4L1011FT is a 4-cycle, inline
4-cylinder, turbocharged air-cooled diesel engine, part of the renowned
1011 family of compact industrial powerplants. Developed for heavy-duty
applications in construction, agriculture, and material handling, this
engine is distinguished by its integrated oil cooling system, which
replaces the heavy liquid coolant radiators found in conventional
engines. The "B" designation indicates turbocharging, while "F"
signifies a power take-off (PTO) configuration.
Introduced in the 1990s, the 1011 series was designed to fill the gap
between smaller 2-cylinder units and larger 6-cylinder models, offering
a balance of power and compact dimensions. The BF4L1011FT operates with
a displacement of approximately 2.73 liters and utilizes a unique
modular cylinder design. Its robust construction, featuring a grey cast
iron crankcase and drop-forged steel connecting rods, ensures durability
in demanding environments such as mining, tunneling, and heavy-duty
wheel loader operations.
The BF4L1011FT is distinguished by its air/oil cooling system, which
relies on a powerful engine-driven fan to direct cooling air over the
integrated oil cooler and finned cylinder barrels. This eliminates the
need for a liquid coolant radiator, water pump, and hoses, significantly
reducing maintenance points and cold-weather starting issues. The engine
utilizes a block-type cast iron cylinder head with a single overhead
camshaft operating two valves per cylinder (one intake, one exhaust).
Fuel is delivered by individual in-line injection pumps integrated into
the crankcase, a design that offers high injection pressure for
efficient combustion.
A mechanical centrifugal governor provides precise speed control, making
it suitable for both variable load equipment (wheel loaders) and
constant speed applications (generators). The engine is known for its
high thermal efficiency and tolerance to extreme ambient temperatures,
although it requires a high rate of airflow for cooling, making it
sensitive to obstructions in front of the cooling fan.
Engine Type: Inline 4-cylinder, 4-stroke, turbocharged diesel.
Displacement: 2.73 L (167 cu.in).
Bore: 91.0 mm (3.58 in).
Stroke: 105.0 mm (4.13 in).
Compression Ratio: 17.0:1.
Combustion System: Direct injection.
Aspiration: Turbocharged (Oil-cooled).
Firing Order: 1-3-4-2.
Direction of Rotation: Counter-clockwise (viewed from flywheel).
Max Output: 46-52 kW (62-70 hp) depending on application and RPM rating.
Rated Speed: 2,300 - 2,500 rpm.
Max Torque: 199 Nm (147 lb-ft) @ 1,800 rpm.
The cylinder block is constructed from grey cast iron using a "modular"
design, featuring individual cylinder barrels held in place by the
crankcase and cylinder head compression. This allows for easy
replacement of liners during overhaul without specialized machining.
The crankcase is a rigid deep-skirt design supporting the crankshaft and
camshaft. The cooling fins are cast into the external surface of the
cylinders. A closed-circuit crankcase breather system routes blow-by
gases back into the intake to reduce emissions.
The cylinder head is a block-type cross-flow casting made of cast iron,
housing the valve train and pre-combustion chambers (if applicable to
specific variants). The valve arrangement consists of overhead valves
(OHV) operated by pushrods and rocker arms from a camshaft located in
the crankcase. The engine utilizes 2 valves per cylinder (one intake,
one exhaust). Valve seats are hardend alloy inserts for durability
against high exhaust gas temperatures.
Valves: 8 total (4 intake, 4 exhaust)
Intake Valve Diameter: 39.0 mm (1.54 in)
Exhaust Valve Diameter: 33.0 mm (1.30 in)
Valve Stem Diameter: 9.0 mm (0.35 in)
Valve Seat Material: High-strength alloy steel inserts
Valve Clearance (Cold): 0.20 mm (0.008 in) for both intake and exhaust
The fuel system utilizes individual in-line injection pumps, one for
each cylinder, integrated into the crankcase and driven by the camshaft.
This system generates high injection pressure for efficient atomization.
A mechanical centrifugal governor regulates engine speed based on load
demand. A serviceable fuel lift pump with an integrated strainer draws
fuel from the tank. The injection nozzles are a five-hole type designed
for the specific direct injection combustion chamber.
The lubrication system is a forced-feed circulation design that serves
dual purposes: lubricating moving parts and removing engine heat. A
rotary pump draws oil from the sump and circulates it through a
paper-type microfilter (replaceable cartridge full-flow filter) and an
external oil cooler. The cooled oil then flows to the main bearings,
connecting rods, and piston cooling jets before returning to the sump.
The oil cooler is a critical component of the cooling system.
Oil Capacity (total system): 10.0 L (10.6 US qt)
Recommended Oil Viscosity: 15W-40 (High quality diesel oil)
Oil Specification: API CG-4 / CF or higher
Oil Pump Type: Rotary gear
The engine utilizes an integrated oil cooling system. Heat is dissipated
by an engine-driven fan that blows air over the engine block fins and an
external oil cooler. There is no liquid coolant. The fan draws ambient
air through a protective grille, passing it over the oil cooler coils
and the finned cylinder barrels to carry heat away.
| Intake and Exhaust Systems |
Intake System: A turbocharger pressurizes the intake air, which is then
directed to the cylinder head.
Exhaust System: The exhaust manifold is located on the side of the
cylinder head, routing gases to the turbocharger. An exhaust silencer is
usually fitted to reduce noise.
12V or 24V starting system depending on equipment specifications, with a
starter motor and alternator.
Overall Length: 630.0 mm (24.8 in)
Overall Width: 495.0 mm (19.5 in)
Overall Height: 703.0 mm (27.7 in)
Dry Weight (without flywheel housing): 240 kg (529 lb)
Valve Clearance (Cold): Intake 0.20 mm (0.008 in); Exhaust 0.20 mm
(0.008 in).
Valve Inspection Interval: Every 500 operating hours.
Engine Oil Change Interval: Every 250 hours or 6 months.
Oil Filter Replacement: Every oil change.
Air Filter Element Cleaning: Every 100 hours; replace annually.
Fuel Filter Replacement: Every 500 hours.
Oil Cooler Cleaning: Inspect and clean fins every 200 hours in dusty
environments.
Cylinder Head Bolts: 100.0 Nm (74 lb-ft)
Connecting Rod Cap Bolts: 80.0 Nm (59 lb-ft)
Main Bearing Cap Bolts: 120.0 Nm (89 lb-ft)
Injection Nozzle Holder: 70.0 Nm (52 lb-ft)
Flywheel Bolts: 110.0 Nm (81 lb-ft)
Crankshaft Pulley Bolt: 200.0 Nm (148 lb-ft)
The Deutz BF4L1011FT engine was utilized across a wide range of heavy
industrial and agricultural machinery.
Wheel Loaders: Standard engine in compact and mid-size loaders including
Ahlmann AS 70 , Ahlmann AL 100t , Zettelmeyer ZL 602 SC , and various
Schaeff, Kramer, and Weidemann models.
Dumpers: Power source for articulated dumpers such as the Paus AKD 202.
Forklifts: Installed in heavy-duty cross-country and container forklifts
(Linde, Still, Jungheinrich).
Industrial Generators: Used in prime and standby gensets requiring 40-60
kW of continuous power.
Mining Equipment: Approved for underground mining machinery due to low
exhaust fumes and spark resistance.
Agricultural Tractors: Used in specialized utility tractors (Deutz-Fahr
Agrocompact, Agrokid series) and self-propelled sprayers.
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