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Deutz BF4M1012 Engine

The Deutz BF4M1012 is a liquid-cooled, four-stroke, four-cylinder inline diesel engine featuring turbocharging and direct mechanical fuel injection. Characterized by its classic monoblock design, this power unit is engineered for light-to-medium industrial machinery, material handling equipment, and construction applications. It avoids electrical position sensors or electronic control units in favor of fully mechanical subsystems, delivering exceptional structural reliability, straightforward workshop maintenance, and a highly compact packaging profile. Bore: 94 mm. Stroke: 115 mm. Total Displacement: 3.192 liters (3190 cc).

Valve Configuration and Timing: The cylinder head utilizes an overhead valve layout with 2 valves per cylinder (8 valves total across the unit). The valvetrain operates via a mechanical camshaft positioned inside the engine block, utilizing pushrods and rocker arms. A defining feature of this layout is that the timing gears are integrated at the rear of the block on the flywheel side, maximizing torsional rigidity and lowering structural vibrations.

Fuel System: The fuel architecture relies on a fully mechanical, single-unit direct-injection system. A dedicated mechanical fuel feed pump transfers fuel to individual high-pressure injection pumps assigned to each cylinder. Injection timing and quantity are dictated purely by cam profiles on the primary internal camshaft, regulating delivery through mechanical multi-hole injection nozzles into the piston bowl. Governing and speed stabilization are managed through a physical centrifugal mechanical speed regulator coupled to the pump rack.

Lubrication System: Lubrication is managed through a closed-circuit, forced-feed system pressurized by a gear-driven oil pump. Structural components include an integrated spin-on oil filter and a dedicated plate-core oil cooler built into the engine block block-side fluid path. The system features internal lube oil ducts distribution channels directly feeding the main bearings, connecting rod journals, and the upper valvetrain assemblies.

Cooling System: The engine uses a pressurized closed-circuit liquid-cooling arrangement. The cooling medium is circulated via an integrated, belt-driven centrifugal water pump through the engine jacket. Temperature regulation is controlled mechanically by a wax-element thermostat that opens at a baseline temperature of 83C. Depending on the application frame, versions include either an engine-mounted integrated radiator setup or external cooling plumbing connections.

General Technical Data

Engine Specifications

Engine Model ............... Deutz BF4M1012
Engine Type ............... 4-cycle inline 4-cylinder turbocharged water-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) ............... 88 (65)
Rated Engine Speed, rpm ............... 2200-2600
Peak Torque ............... 298 Nm (220 lb-ft) at 1500 rpm
Idle Speed ............... 700-800 rpm
Aspiration Type ............... Turbocharged
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 ............... Water-cooled
Water Pump Type ............... Centrifugal
Air Cleaner Type ............... Dry dual-stage
Starting System ............... Electric starter
Electrical System ............... 12V or 24V
Alternator Rating, Amps ............... 35-65

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) ............... 29.6 (750)
Overall Width, in (mm) ............... 26.2 (665)
Overall Height, in (mm) ............... 29.2 (740)
Dry Weight, lbs (kg) ............... 725-880 (330-400)

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) .................. 10.0-10.5 (9.5-10.0)

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)
Water Pump Mounting Bolts ................ 15-20 Nm (11-15 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 BF4M1012E Specs
  
• Deutz BF4M1012EC Specs
  
• Deutz BF4M1012C Specs
  
• Deutz BF6M1012 Specs
  
• Deutz BF6M1012E Specs
  

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