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Deutz BF4L1011FT Engine

The Deutz BF4L1011FT is a four-cylinder, inline, four-stroke diesel engine featuring an integrated cooling system and turbocharging. It belongs to the highly versatile 1011 series, widely utilized in industrial, agricultural, and construction equipment. The "BF" prefix denotes turbocharging, while the "T" indicates a specific tuning configuration for optimized torque and power delivery. A defining characteristic of this engine is its innovative integrated cooling mechanism, which utilizes the engine’s own lubricating oil as the primary cooling medium for the cylinder heads and barrels. This design eliminates the need for an external water radiator, water pump, and coolant hoses, significantly reducing weight, dimensions, and potential failure points. This makes the engine exceptionally reliable in harsh working environments.

The engine utilizes an overhead valve (OHV) configuration with 2 valves per cylinder, totaling 8 valves for the entire engine. The valves are actuated by a single, low-mounted camshaft via pushrods and rocker arms. Valve clearance adjustments must be performed mechanically using the adjustment screws on the rocker arms while the engine is cold. The cylinder bore diameter is exactly 91.0 mm (3.58 inches). The piston stroke length is exactly 105.0 mm (4.13 inches). This brings the total engine displacement to 2.73 liters (2732 cc).

The fuel system relies on a high-pressure direct injection setup. It utilizes a mechanical fuel transfer pump to draw diesel from the tank through a primary fuel filter and water separator. The defining feature is the Deutz unit injection system, which uses individual single-wheel injection pumps (one for each cylinder) driven directly by the engine camshaft. High-pressure fuel lines deliver fuel from these unit pumps to multi-hole mechanical injection nozzles, ensuring precise atomization directly into the combustion chamber. Engine speed and fuel delivery are managed by a mechanical centrifugal governor integrated into the timing gear drive.

The engine features a forced-feed lubrication system pressurized by a gear-type oil pump driven directly from the crankshaft. This system performs a dual function: lubricating critical internal components and cooling the engine. The oil flows through a full-flow cartridge filter. An integrated high-efficiency oil cooler is mounted directly to the engine block to dissipate heat from the cooling/lubricating oil before it is recirculated. The BF4L1011FT utilizes an oil/air cooling system. The engine block, cylinder walls, and cylinder head jackets are cooled internally by the circulating engine oil. External heat dissipation is assisted by an engine-driven cooling fan that forces ambient air across the external cooling fins of the integrated oil cooler and the engine block block casting.

General Technical Data

Engine Specifications

Engine Model ............... Deutz BF4L1011FT
Engine Type ............... 4-stroke inline 4-cylinder direct injection turbocharged oil-air cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line vertical
Engine Bore, in (mm) ............... 3.58 (91.0)
Engine Stroke, in (mm) ............... 4.13 (105.0)
Displacement, cu.in (L) ............... 167 (2.73)
Rated Engine Power, hp (kW) ............... 75.0 (56.0)
Rated Engine Speed, rpm ............... 2800
Maximum Torque ............... 147.5 lb-ft (200 Nm) at 1800 rpm
Minimum Idle Speed, rpm ............... 900
Maximum No-Load Speed, rpm ............... 3000
Aspiration Type ............... Turbocharged
Compression Ratio ............... 17.0:1
Firing Order ............... 1-3-4-2
Direction of Rotation ............... Counter-clockwise looking at flywheel
Cylinder Block Material ............... Cast iron
Cylinder Head Material ............... Cast iron
Lubrication System ............... Forced-feed pressure lubrication via gear pump
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System Type ............... Integrated oil cooling system combined with external air fan airflow
Combustion System ............... Direct injection with individual unit injection pumps
Air Cleaner Type ............... Dry type with safety cartridge and restriction indicator
Starting System ............... Electric motor starter
Electrical System Voltage, V ............... 12 or 24
Alternator Output Capacity, A ............... 60 or 35

Fuel System

Fuel Injection Pump Type ............... Deutz PF61 individual unit injection pumps
Fuel Injection Pump Drive Mechanism ............... Internal gear-driven
Fuel Injection Nozzle Type ............... Multi-hole throttling pin injection nozzle unit
Number of Injection Nozzle Holes ............... 5
Nozzle Hole Diameter, in (mm) ............... 0.0083 (0.21)
Governor Type ............... Mechanical centrifugal governor with torque control
Fuel Injection Nozzle Opening Pressure, psi (bar) ............... 3625.9 (250.0)
Fuel Feed Pump Type ............... Mechanical diaphragm type pump
Fuel Feed Pump Pressure, psi (bar) ............... 5.8-11.6 (0.4-0.8)
Fuel Filter Type ............... Spin-on high efficiency canister filter cartridge
Injection Timing Start of Delivery, deg BTDC ............... 11.0-13.0

Dimensions and Weight

Overall Length, in (mm) ............... 24.8 (630.0)
Overall Width, in (mm) ............... 21.1 (535.0)
Overall Height, in (mm) ............... 27.4 (695.0)
Dry Weight Without Accessories, lbs (kg) ............... 565 (255)
Wet Weight With Operating Fluids, lbs (kg) ............... 595 (270)

Maintenance Data

Service Information

Compression Pressure (Standard), psi (bar) ............... 362.6-435.1 (25.0-30.0)
Oil Pressure at Low Idle Speed, psi (bar) ............... 14.5 (1.0)
Oil Pressure at Rated Speed, psi (bar) ............... 43.5-65.2 (3.0-4.5)
Maximum Engine Oil Temperature, F (C) ............... 266.0 (130.0)
Intake Valve Clearance, in (mm) ............... 0.008-0.012 (0.20-0.30)
Exhaust Valve Clearance, in (mm) ............... 0.020-0.024 (0.50-0.50)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CG-4, CH-4, CI-4
Engine Oil Capacity Min Level, qt (L) ............... 6.3 (6.0)
Engine Oil Capacity Max Level, qt (L) ............... 11.1 (10.5)
Total Engine Oil Capacity Including Filter, qt (L) ............... 11.6 (11.0)

Service Intervals

Change oil and filter ............... Every 500 hours
Replace fuel filters ............... Every 500 hours
Inspect air filter ............... Every 250 hours
Replace air filter ............... Every 1000 hours
Valve clearance adjustment ............... Every 500 hours
Change coolant ............... 1000 hours or 2 years
Fuel system inspection ............... Every 1500 hours
Compression test ............... Every 2000 hours
Drain water separator ............... As required
Belt inspection ............... As required

Service Specifications

Cylinder Bore Inside Diameter ................ 3.5827-3.5835 in (91.000-91.020 mm)
Crankshaft Journal Outside Diameter ................ 2.7485-2.7490 in (69.812-69.825 mm)
Crank Pin Outside Diameter ................ 2.4060-2.4065 in (61.112-61.125 mm)
Crankshaft End Play ................ 0.0039-0.0110 in (0.100-0.280 mm)
Intake Valve Stem Outside Diameter ................ 0.3142-0.3146 in (7.980-7.990 mm)
Exhaust Valve Stem Outside Diameter ................ 0.3134-0.3138 in (7.960-7.970 mm)
Intake Valve Guide Inside Diameter ................ 0.3157-0.3165 in (8.020-8.040 mm)
Exhaust Valve Guide Inside Diameter ................ 0.3157-0.3165 in (8.020-8.040 mm)
Intake Valve Stem to Guide Clearance ................ 0.0012-0.0024 in (0.030-0.060 mm)
Exhaust Valve Stem to Guide Clearance ................ 0.0020-0.0031 in (0.050-0.080 mm)
Intake Valve Spring Free Length ................ 1.8898 in (48.00 mm)
Exhaust Valve Spring Free Length ................ 1.8898 in (48.00 mm)
Intake Cam Height ................ 1.8701-1.8740 in (47.500-47.600 mm)
Exhaust Cam Height ................ 1.8701-1.8740 in (47.500-47.600 mm)
Piston Pin Outside Diameter ................ 1.0236-1.0240 in (26.000-26.010 mm)
Piston Pin to Piston Bore Clearance ................ 0.0003-0.0007 in (0.008-0.018 mm)
Top Ring Side Clearance ................ 0.0024-0.0035 in (0.060-0.090 mm)
Second Ring Side Clearance ................ 0.0016-0.0028 in (0.040-0.070 mm)
Oil Ring Side Clearance ................ 0.0012-0.0024 in (0.030-0.060 mm)
Top Ring End Gap ................ 0.0098-0.0157 in (0.250-0.400 mm)
Second Ring End Gap ................ 0.0118-0.0177 in (0.300-0.450 mm)
Oil Ring End Gap ................ 0.0098-0.0157 in (0.250-0.400 mm)

Tightening Torque Specs

Cylinder Head Bolts ................ 150-180 Nm (111-133 lb-ft)
Main Bearing Cap Bolts ................ 220-260 Nm (162-192 lb-ft)
Connecting Rod Cap Bolts ................ 70-90 Nm (52-66 lb-ft)
Flywheel Bolts ................ 180-220 Nm (133-162 lb-ft)
Crankshaft Pulley Bolt ................ 200-240 Nm (148-177 lb-ft)
Oil Drain Plug ................ 30-40 Nm (22-30 lb-ft)
Injector Hold Down Bolts ................ 20-25 Nm (15-18 lb-ft)
Injection Nozzle Holder ................ 70.0 Nm (52 lb-ft)

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