________________________________________________________________________________

Deutz F4L1011 Engine

The Deutz F4L1011 is a heavy-duty, 4-stroke cycle, 4-cylinder inline diesel engine widely deployed in industrial, agricultural, and construction equipment like skid-steer loaders, excavators, and portable generators. Engineered for high reliability, compact footprints, and reduced noise emissions, this model utilizes an overhead mechanical valve (OHV) layout and a uniquely integrated fluid thermal management system. All routine service checkpoints are located strategically on one side of the block to streamline diagnosis and field service operations.

Valve Configuration: Overhead valve configuration utilizing mechanical pushrods and rocker arms acting on two overhead valves per cylinder (one intake, one exhaust) driven by a tooth-belt system. Bore and Stroke: Features a 91 mm cylinder bore and a 105 mm piston stroke, providing a total displacement of 2.73 liters. The compression ratio for this naturally aspirated setup is fixed at 18.5:1.

Fuel System: Direct injection architecture utilizing individual single injection pumps (one unit injector per cylinder) driven off the internal camshaft. The system incorporates a mechanical centrifugal speed governor, a dedicated fuel feed lift pump with an internal strainer, a replaceable cartridge fuel filter, and multi-hole injection nozzles delivering fuel under high pressure directly into the combustion bowl.

Lubrication System: Forced-feed lubrication system managed by an integrated gear-driven oil pump. The system features a spin-on paper-type micro-filter cartridge acting as a full-flow filter. The primary engine lubricating oil also doubles as the thermodynamic heat transfer medium for the engine’s internal thermal balance.

Cooling System: Integrated oil cooling design that relies on a factory-supplied unit with a built-in cooling fan. Circulating engine oil flows directly through the high-temperature zones of the cylinder heads and engine block before passing through the integrated light-metal oil cooler, eliminating the risk of coolant cavitation and jacket corrosion.

General Technical Data

Engine Specifications

Engine Model ............... Deutz F4L1011
Engine Type ............... 4-cycle inline 4-cylinder integrated air/oil-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) ............... 166.6 (2.732)
Maximum Rated Power, hp (kW) ............... 59.0 (44.0) at 3000 rpm
Maximum Rated Speed, rpm ............... 3000
Minimum Idle Speed, rpm ............... 900
Maximum Torque, lb-ft (Nm) ............... 140.1 (190.0) at 1800 rpm
Compression Ratio ............... 18.5:1
Firing Order ............... 1-3-4-2
Aspiration Type ............... Naturally aspirated
Direction of Rotation ............... Counter-clockwise looking onto flywheel
Combustion System ............... Direct injection
Cylinder Block Material ............... High-strength cast iron
Cylinder Head Material ............... Cast iron alloy
Crankshaft Material ............... Forged steel with induction hardened journals
Connecting Rod Material ............... Forged steel split-type
Lubrication System Type ............... Full-pressure lubrication with integrated oil cooler
Oil Pump Type ............... Rotary gear pump driven by crankshaft
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System Type ............... Integrated air-oil cooling system
Cooling Fan Type ............... Belt-driven axial blower fan
Air Cleaner Type ............... Dry type with primary and safety elements
Starting System Type ............... Electric starter motor
Electrical System Voltage, V ............... 12
Alternator Output Capacity, A ............... 60-80

Fuel System

Fuel Injection Pump Type ............... Single unit injection pumps integrated into cylinder block
Number of Injection Pumps ............... 4
Fuel Injection Pump Drive ............... Driven by internal camshaft lobes
Fuel Injection Valve Type ............... Multi-hole nozzle type
Fuel Injection Pressure, psi (bar) ............... 3625 (250)
Fuel Lift Pump Type ............... Mechanical diaphragm pump driven by camshaft
Fuel Lift Pump Pressure, psi (bar) ............... 4.35-7.25 (0.3-0.5)
Fuel Filter Type ............... Spin-on full-flow cartridge filter element
Governor Type ............... Mechanical centrifugal, integrated within the block assembly
Fuel Injection Timing Advance, deg BTDC ............... 12-14
Fuel Nozzle Opening Pressure (Min), psi (bar) ............... 3190.8 (220.0)

Dimensions and Weight

Overall Length, in (mm) ............... 28.1 (715.0)
Overall Width, in (mm) ............... 20.8 (530.0)
Overall Height, in (mm) ............... 26.6 (675.0)
Dry Weight without Starter or Alternator, lbs (kg) ............... 530 (240)
Wet Weight with All Operating Fluids, lbs (kg) ............... 570 (260)

Maintenance Data

Service Information

Compression Pressure Range, psi (bar) ............... 362.5-435.1 (25.0-30.0)
Compression Difference Between Cylinders, psi (bar) ............... 43.5 (3.0)
Oil Pressure at Low Idle Speed, psi (bar) ............... 11.6 (0.8)
Oil Pressure at Rated Speed, psi (bar) ............... 43.5-58.0 (3.0-4.0)
Maximum Oil Temperature in Oil Pan, F (C) ............... 266 (130)
Intake Valve Clearance, in (mm) ............... 0.012-0.016 (0.30-0.40)
Exhaust Valve Clearance, in (mm) ............... 0.020-0.024 (0.50-0.60)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CH-4, CG-4
Engine Oil Capacity with Filter (Minimum Std Pan), qt (L) ............... 6.34 (6.0)
Engine Oil Capacity with Filter (Maximum Std Pan), qt (L) ............... 11.1 (10.5)
Engine Oil Capacity with Filter (Industrial High Pan), qt (L) ............... 13.2 (12.5)

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 1000 hours
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 (M12), Stage 1 ................ 25 Nm (18 lb-ft)
Cylinder Head Bolts (M12), Stage 2 ................ 50 Nm (37 lb-ft)
Cylinder Head Bolts (M12), Stage 3 ................ 80 Nm (59 lb-ft)
Cylinder Head Bolts (M12), Stage 4 ................ 105-115 Nm (77-85 lb-ft)
Main Bearing Cap Bolts (M12) ................ 60-65 Nm (44-48 lb-ft)
Connecting Rod Cap Bolts (M10) ................ 40-45 Nm (30-33 lb-ft)
Camshaft Bearing Cap Bolts (M8) ................ 20-25 Nm (15-18 lb-ft)
Flywheel Bolts (M10) ................ 35-40 Nm (26-30 lb-ft)
Crankshaft Pulley Bolt (M14) ................ 100-120 Nm (74-89 lb-ft)
Intake Manifold Nuts (M8) ................ 15-20 Nm (11-15 lb-ft)
Exhaust Manifold Nuts (M8) ................ 20-25 Nm (15-18 lb-ft)
Injector Hold-Down Clamp Bolts (M8) ................ 15-18 Nm (11-13 lb-ft)
Glow Plugs (M8) ................ 10-12 Nm (7-9 lb-ft)
Rocker Arm Shaft Bracket Bolts (M8) ................ 20-25 Nm (15-18 lb-ft)
Rocker Arm Adjuster Locknut (M6) ................ 8-10 Nm (6-7 lb-ft)
Valve Cover Nuts (M6) ................ 5-7 Nm (4-5 lb-ft)
Oil Pan Bolts (M6) ................ 8-10 Nm (6-7 lb-ft)
Oil Pump Mounting Bolts (M6) ................ 12-15 Nm (9-11 lb-ft)
Oil Cooler Mounting Bolts (M6) ................ 8-10 Nm (6-7 lb-ft)
Oil Filter Head Bolts (M8) ................ 15-18 Nm (11-13 lb-ft)
Fuel Injection Pump Mounting Nuts (M8) ................ 18-22 Nm (13-16 lb-ft).
Fuel Lift Pump Mounting Bolts (M6) ................ 8-10 Nm (6-7 lb-ft)
Engine Mount (Bracket to Block, M10) ................ 35-40 Nm (26-30 lb-ft)
Starter Motor Bolts (M10) ................ 30-35 Nm (22-26 lb-ft)

________________________________________________________________________________________

• Deutz Engines Specs
  
• Deutz F2L1011 Specs
  
• Deutz F2L1011F Specs
  
• Deutz F3L1011F Specs
  
• Deutz F4L1011F Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________