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Deutz F2L1011F Engine

The Deutz F2L1011F is a naturally aspirated, inline two-cylinder engine designed for durability and compact performance. It features an integrated cooling system, where the engine oil doubles as the cooling medium for the cylinder heads and barrels. This eliminates the need for an external water radiator, hoses, and water pumps, making the engine highly reliable and minimizing maintenance requirements in harsh operating environments. Its rugged cast-iron block and overhead valve configuration ensure a long service life and high power density.

The engine utilizes a conventional overhead valve (OHV) layout with two valves per cylinder (one intake and one exhaust). Valves are operated via pushrods and rocker arms, driven by a gear-driven camshaft located in the engine block. Valve clearance adjustments must be performed mechanically at specified maintenance intervals on a cold engine. The cylinder bore diameter is 91 mm, and the piston stroke length is 105 mm, resulting in a total displacement of 1.37 liters across both cylinders.

Fuel delivery is managed via a direct injection (DI) system featuring independent single-injection pumps (one for each cylinder) integrated directly into the engine block. These unit pumps are driven mechanically by the engine's camshaft, generating high injection pressures for precise fuel atomization. Fuel is drawn from the supply tank through a primary fuel filter and water separator, then delivered to the injection pumps, which feed the multi-hole mechanical fuel injectors. Engine speed and load regulation are controlled by a mechanical centrifugal governor integrated into the timing gear housing.

Lubrication is managed by a forced-feed circulation system driven by a gear-type oil pump. Oil is drawn from the deep oil sump and forced through an external spin-on full-flow oil filter before reaching the main bearings, connecting rod bearings, and camshaft. A critical dual-function feature of this system is that the pressure-fed oil is also circulated through integrated cooling passages in the cylinder head and engine block, acting as the primary heat-transfer fluid before returning to an external oil cooler and the oil pan.

The engine uses an integrated air/oil cooling system rather than a conventional liquid coolant setup. An engine-driven cooling fan forces ambient air across the external oil cooler and the finned surfaces of the engine block. The internal engine heat is absorbed primarily by the circulating engine oil, which is then routed through the oil cooler. This design ensures rapid warm-up to optimal operating temperature and consistent thermal regulation without the risk of freezing or boiling.

General Technical Data

Engine Specifications

Engine Model ............... Deutz F2L1011F
Engine Type ............... 4-cycle inline 2-cylinder direct injection oil-air cooled diesel
Number of Cylinders ............... 2
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) ............... 83.6 (1.37)
Rated Engine Power, hp (kW) ............... 29.5 (22.0)
Maximum Engine Power, hp (kW) ............... 30.0 (22.4)
Minimum Engine Power, hp (kW) ............... 16.1 (12.0)
Rated Engine Speed, rpm ............... 1500-3000
Peak Torque, lb-ft (Nm) ............... 59.0 (80.0) at 1700 rpm
Maximum Torque, lb-ft (Nm) ............... 62.7 (85.0) at 1800 rpm
Minimum Low Idle Speed, rpm ............... 850-950
Maximum High Idle Speed, rpm ............... 3150-3250
Aspiration Type ............... Naturally Aspirated
Standard Operating Speed, rpm ............... 1500-2800
Compression Ratio ............... 18.5:1
Firing Order ............... 1-2
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 ............... 55-60

Fuel System

Fuel Injection Pump Type ............... Integrated single unit injection pumps (PFR type)
Number of Fuel Injection Pumps ............... 2
Fuel Injection Pump Drive ............... Driven directly by the engine camshaft
Injection Nozzle Hole Number ............... 5
Fuel Injector Type ............... Multi-hole nozzle holder assembly
Fuel Injector Opening Pressure, psi (bar) ............... 3625.9 (250.0)
Governor Type ............... Mechanical centrifugal governor
Fuel Transfer Pump Type ............... Mechanical plunger or diaphragm
Fuel Transfer Pump Pressure, psi (bar) ............... 5.8-11.6 (0.4-0.8)
Fuel Filter Type ............... Spin-on high efficiency element
Fuel Injection Timing, deg BTDC ............... 11.5-13.5

Dimensions and Weight

Overall Length, in (mm) ............... 16.0 (405)
Overall Width, in (mm) ............... 17.7 (450)
Overall Height, in (mm) ............... 26.9 (685)
Dry Weight with Integrated Cooling System, lbs (kg) ............... 385 (175)
Wet Weight with Operating Fluids, lbs (kg) ............... 410 (185)

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) ............... 257.0 (125.0)
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 Change, qt (L) ............... 6.3 (6.0)
Engine Oil Capacity without Filter Change, qt (L) ............... 5.8 (5.5)
Minimum Allowable Oil Capacity, qt (L) ............... 3.7 (3.5)

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)

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• Deutz Engines Specs
  
• Deutz F2L1011 Specs
  
• Deutz F3L1011F Specs
  
• Deutz F4L1011 Specs
  
• Deutz F4L1011F Specs
  

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