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Deutz BF4M1012EC Engine

The Deutz BF4M1012EC is a highly reliable, heavy-duty 4-cylinder, in-line, four-stroke diesel engine designed primarily for mobile industrial machinery, construction equipment, and agricultural applications. It features a classic, robust monoblock cast-iron crankcase design. The engine utilizes explicit mechanical simplicity combined with high power density, ensuring efficient thermal and mechanical performance even under highly intermittent, heavy-load operations. The BF4M1012EC designation indicates a turbocharged (B), four-stroke (F), 4-cylinder (4) unit belonging to the 1012 engine family (1012), liquid-cooled (M), with an integrated automotive/construction application configuration (E), and equipped with an air-to-air charge air intercooler (C).

Valve Configuration: The engine utilizes an overhead valve configuration driven by a conventional overhead-valve (OHV) layout. It features a total of 8 valves (2 valves per cylinder: 1 intake and 1 exhaust). The steel camshaft is mounted inside the cylinder block and actuates the valves via pushrods and rocker arms. Bore and Stroke: The cylinder configuration features a bore diameter of 94 mm and a piston stroke of 115 mm. Total displacement is measured precisely at 3.192 liters.

Fuel System: The injection system relies on a fully mechanical, high-pressure design. It features individual mechanical single injection pumps (unit pumps) integrated inside the crankcase for each cylinder, driven directly by dedicated pump lobes on the central camshaft. Fuel is pressurized and fed directly through 6-hole injection nozzles into the combustion chamber without leak-oil lines. Fuel delivery volume is mechanically regulated by an integrated centrifugal mechanical speed governor.

Lubrication System: It operates via a forced-feed circulation lubrication system pressurized by an integrated, gear-driven lube oil pump. The system includes a spin-on lube oil filter cartridge, a closed-circuit crankcase breather, and an integrated oil-to-coolant heat exchanger (lube oil cooler) linked directly into the engine's primary cooling circuit. Pistons are explicitly oil-cooled from below via dedicated spray nozzles.

Cooling System: This engine utilizes a thermostatically controlled liquid-cooling circuit powered by a heavy-duty, integrated coolant pump. The "EC" variant features a dual cooling layout incorporating a conventional liquid radiator circuit for the engine block alongside an air-to-air charge air cooler (intercooler) to lower intake air temperatures post-turbocharger.

General Technical Data

Engine Specifications

Engine Model ............... Deutz BF4M1012EC
Engine Type ............... 4-cycle inline 4-cylinder turbocharged liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.70 (94.0)
Engine Stroke, in (mm) ............... 4.53 (115.0)
Displacement, cu.in (L) ............... 194.6 (3.19)
Rated Engine Power, hp (kW) ............... 110 (82)
Rated Engine Speed, rpm ............... 2200-2600
Peak Torque ............... 376 Nm (279 lb-ft) at 1500 rpm
Idle Speed ............... 700-800 rpm
Aspiration Type ............... Turbocharged and intercooled
Operating Speed ............... 2500 rpm
Compression Ratio ............... 17.5:1
Firing Order ............... 1-3-4-2
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Air Cleaner Type ............... Dry dual-stage
Starting System ............... Electric starter
Electrical System ............... 12V or 24V
Alternator Rating, Amps ............... 40-65

Fuel System

Fuel System ............... Unit Pump System
Injection System ............... High-pressure Pump-Line-Nozzle (PLN)
Injection Pump ............... Mechanical
Fuel Lift Pump ............... Integrated in V-belt tensioner
Injection Timing ............... 14 ± 1 deg BTDC
Injection Nozzle ............... Five-hole type
Fuel Type ............... Diesel

Dimensions and Weight

Overall Length, in (mm) ............... 35.6 (900)
Overall Width, in (mm) ............... 29.5 (750)
Overall Height, in (mm) ............... 33.2 (840)
Dry Weight, lbs (kg) ............... 765-880 (350-400)

Maintenance Data

Service Information

Minimum Oil Pressure (1800 rpm) ............... 2.5 Bar (36 psi)
Minimum Oil Pressure (Low Idle, 900 rpm) ............... 1.4 Bar (20 psi)
Maximum System Pressure (Cold Start) ............... 3.4 Bar (50 psi)
Intake Valve Clearance, in (mm) ............... 0.011-0.013 (0.27-0.33)
Exhaust Valve Clearance, in (mm) ............... 0.018-0.021 (0.47-0.53)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CF-4 or higher
Engine Oil Capacity, qts (L) .................. 10.5-11.0 (10.0-10.5)
Coolant Capacity, qts (L) .................. 5.5-5.8 (5.3-5.6)

Service Intervals

Change oil and filter ............... Every 250 hours
Replace fuel filters ............... Every 500 hours
Inspect air filter ............... Every 100 hours
Replace air filter ............... Every 500 hours
Valve clearance adjustment ............... Every 1000 hours
Change coolant ............... 1000 hours or 2 years
Fuel system inspection ............... Every 1500 hours
Compression test ............... Every 3000 hours
Drain water separator ............... As required
Belt inspection ............... As required

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ................ 3.7008 (94.00)
Crankshaft Journal Outside Diameter, in (mm) ................ 2.7559 (70.00)
Crank Pin Outside Diameter, in (mm) ................ 2.1654 (55.00)
Crankshaft End Play, in (mm) ................ 0.0039-0.0118 (0.10-0.30)
Intake Valve Stem Outside Diameter, in (mm) ................ 0.3142 (7.98)
Exhaust Valve Stem Outside Diameter, in (mm) ................ 0.3134 (7.96)
Intake Valve Guide Inside Diameter, in (mm) ................ 0.3150 (8.00)
Exhaust Valve Guide Inside Diameter, in (mm) ................ 0.3150 (8.00)
Intake Valve Stem to Guide Clearance, in (mm) ................ 0.0024 (0.06)
Exhaust Valve Stem to Guide Clearance, in (mm) ................ 0.0031 (0.08)
Intake Valve Spring Free Length, in (mm) ................ 2.3228 (59.00)
Exhaust Valve Spring Free Length, in (mm) ................ 2.3228 (59.00)
Intake Cam Height, in (mm) ................ 1.8819 (47.80)
Exhaust Cam Height, in (mm) ................ 1.8819 (47.80)
Piston Pin Outside Diameter, in (mm) ................ 1.3386 (34.00)
Piston Pin to Piston Bore Clearance, in (mm) ................ 0.0002-0.0005 (0.004-0.012)
Top Ring Side Clearance, in (mm) ................ 0.0035-0.0047 (0.09-0.12)
Second Ring Side Clearance, in (mm) ................ 0.0024-0.0035 (0.06-0.09)
Oil Ring Side Clearance, in (mm) ................ 0.0016-0.0028 (0.04-0.07)
Top Ring End Gap, in (mm) ................ 0.0315 (0.80)
Second Ring End Gap, in (mm) ................ 0.0709 (1.80)
Oil Ring End Gap, in (mm) ................ 0.0354 (0.90)

Tightening Torque Specs

Cylinder Head Bolts (Step 1) ................ 60 Nm (44 lb-ft)
Cylinder Head Bolts (Step 2) ................ 100 Nm (74 lb-ft)
Crankshaft Pulley Bolt ................ 300-350 Nm (221-258 lb-ft)
Connecting Rod Cap Bolts ................ 50-55 Nm (37-41 lb-ft)
Main Bearing Cap Bolts (Step 1) ................ 80 Nm (59 lb-ft)
Main Bearing Cap Bolts (Step 2) ................ 100 Nm (74 lb-ft)
Flywheel Bolts ................ 110 Nm (81 lb-ft)
Rocker Arm Shaft Bracket Bolts ................ 25-30 Nm (18-22 lb-ft)
Rocker Arm Adjustment Locknut ................ 10 Nm (7 lb-ft)
Intake Manifold Bolts ................ 20-25 Nm (15-18 lb-ft)
Exhaust Manifold Nuts ................ 30-35 Nm (22-26 lb-ft)
Oil Pan Bolts ................ 10-12 Nm (7-9 lb-ft)
Injection Nozzle Holders ................ 50-60 Nm (37-44 lb-ft)
High-Pressure Fuel Line Nuts ................ 18-22 Nm (13-16 lb-ft)
Individual Injection Pump Retaining Screws ................ 25-30 Nm (18-22 lb-ft)
Valve Cover Bolts ................ 10-12 Nm (89-106 lb-in)
Oil Pan Bolts ................ 15-20 Nm (11-15 lb-ft)
Oil Filter (spin-on) ................ 20 Nm (15 lb-ft)
Turbocharger Mounting Nuts ................ 35-40 Nm (26-30 lb-ft)
Intercooler Mounting Bolts ................ 20 Nm (15 lb-ft)
Starter Motor Mounting Bolts ................ 35-40 Nm (26-30 lb-ft)
Alternator Mounting Bracket Bolts ................ 25-30 Nm (18-22 lb-ft)

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• Deutz Engines Specs
  
• Deutz BF4M1012 Specs
  
• Deutz BF4M1012E Specs
  
• Deutz BF4M1012C Specs
  
• Deutz BF6M1012 Specs
  
• Deutz BF6M1012E Specs
  

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