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Deutz BF4L1011F Engine

The Deutz BF4L1011F is a heavy-duty, four-stroke diesel engine engineered for high reliability, compact packaging, and low exhaust emissions. The defining architectural feature of the 1011 series is its integrated cooling system. By utilizing the engine's lubrication oil as the primary cooling medium, Deutz eliminated the need for external water jackets, radiators, and coolant hoses. This design prevents typical liquid-cooled vulnerabilities such as cavitation, freezing, and external coolant leaks. The addition of a turbocharger significantly improves power density, altitude performance, and thermal efficiency compared to its naturally aspirated counterparts, making it a preferred choice for high-load industrial machinery.

The engine features an overhead valve design driven by a single camshaft located in the crankcase. Power is transmitted to the valves via pushrods and rocker arms. Each cylinder is equipped with two valves: one intake and one exhaust. Mechanical valve lash adjustment is required during routine maintenance to ensure proper thermal clearance and optimal gas exchange. The engine features a square-to-slightly-long-stroke geometry engineered to maximize combustion efficiency and torque delivery. The cylinder bore diameter measures exactly 91.0 mm (3.58 inches), and the piston stroke length measures exactly 105.0 mm (4.13 inches). This setup provides a total displacement of 2.73 liters.

Fuel delivery relies on a highly efficient direct injection system utilizing individual unit pumps for each cylinder. This system integrates the high-pressure injection pump and the injection nozzle into a unified mechanism for each combustion chamber, driven directly by the engine's camshaft. A mechanical centrifugal governor regulates fuel metering to maintain steady engine speeds under changing loads. The supply circuit includes a mechanical feed pump, a primary fuel filter with a water separator, and a secondary fine-particle fuel filter to protect the high-pressure injection components from contamination.

The BF4L1011F employs a combined lubrication and cooling circuit, often referred to as an oil-cooled system. A high-capacity gear pump circulates engine oil through the internal engine components for lubrication, while simultaneously routing a large volume of the oil through an integrated high-efficiency oil cooler. This oil absorbs heat directly from the cylinder heads and cylinder walls. The system is protected by a spin-on full-flow oil filter and an internal pressure relief valve to maintain optimal operating pressures under varying thermal loads.

General Technical Data

Engine Specifications

Engine Model ............... Deutz BF4L1011F
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) ............... 166.7 (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) ............... 27.9 (710.0)
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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• Deutz Engines Specs
  
• Deutz BF3M1011F Specs
  
• Deutz BF4L1011FT Specs
  
• Deutz BF4M1011 Specs
  
• Deutz BF4M1011F Specs
  
• Deutz F4M1011F Specs
  

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