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Deutz BF4M1012C Engine

The Deutz BF4M1012C is a heavy-duty, water-cooled, four-cylinder inline diesel engine designed primarily for mobile industrial machinery and construction equipment. Built on a rigid grey cast iron monoblock crankcase, it utilizes overhead valves driven by pushrods and rocker arms from a block-mounted camshaft. The engine designation indicates turbocharging (B), a high-speed four-stroke cycle (F), a four-cylinder configuration (4), liquid cooling (M), the 1012 series designation, and charge air cooling (C). It incorporates a fully mechanical governing system and individual high-pressure injection pumps per cylinder, ensuring reliable mechanical operation without electronic intervention.

The cylinder head features a classic overhead valve (OHV) arrangement with two valves per cylinder (one inlet and one exhaust valve, totaling eight valves for the engine). The valvetrain is mechanically driven by the camshaft located in the engine block via pushrods and rocker arms. Cylinder Bore: 94 mm. Piston Stroke: 115 mm. Total Engine Displacement: 3.192 liters.

Fuel delivery uses a direct-injection layout centered around a mechanical single-pump system (Deutz Unit Pump System). Each cylinder is equipped with its own dedicated mechanical injection pump actuated by individual cam profiles on the primary camshaft. These single pumps generate injection pressures of up to 1600 bar, atomizing fuel directly through short high-pressure lines into the piston combustion bowl. Timing and fuel metering are controlled by a mechanical governor connected to the fuel racks, completely isolated from electronic sensors.

Lubrication is managed via a forced-feed circulation loop driven by a gear-type oil pump. The system includes an integrated oil cooler mounted to the cylinder block, which uses the engine's coolant flow to stabilize oil temperatures under high load. Structural filtration relies on a full-flow spin-on cartridge filter. Internal piston cooling is achieved via dedicated oil nozzles projecting spray directly beneath the piston crowns.

The cooling architecture consists of a thermostatically controlled liquid-cooling circuit utilizing a centrifugal water pump driven by a V-belt. The model employs an air-to-air charge air cooler (intercooler) to lower incoming intake manifold temperatures following turbocharger compression. The cooling circuit maintains operating conditions with a standard thermostat opening temperature beginning at 83C.

General Technical Data

Engine Specifications

Engine Model ............... Deutz BF4M1012C
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 ............... Water-cooled
Water Pump Type ............... Centrifugal
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) ............... 33.6 (850)
Overall Width, in (mm) ............... 27.5 (700)
Overall Height, in (mm) ............... 29.2 (740)
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) .................. 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)
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)
Water Pump Mounting Bolts ................ 15-20 Nm (11-15 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 BF4M1012EC Specs
  
• Deutz BF6M1012 Specs
  
• Deutz BF6M1012E Specs
  

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